# URLConnection

public abstract class **URLConnection** extends [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)  

|---|---|---|
| Known Direct Subclasses [HttpURLConnection](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/HttpURLConnection.html), [JarURLConnection](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html) |---|---| | [HttpURLConnection](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/HttpURLConnection.html) | A URLConnection with support for HTTP-specific features. | | [JarURLConnection](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html) | A URL Connection to a Java ARchive (JAR) file or an entry in a JAR file. | |||

|---|---|---|
| Known Indirect Subclasses [HttpsURLConnection](https://developers.google.com/j2objc/javadoc/jre/reference/javax/net/ssl/HttpsURLConnection.html) |---|---| | [HttpsURLConnection](https://developers.google.com/j2objc/javadoc/jre/reference/javax/net/ssl/HttpsURLConnection.html) | `HttpsURLConnection` extends `HttpURLConnection` with support for https-specific features. | |||

The abstract class `URLConnection` is the superclass
of all classes that represent a communications link between the
application and a URL. Instances of this class can be used both to
read from and to write to the resource referenced by the URL. In
general, creating a connection to a URL is a multistep process:

| `openConnection()` | `connect()` |
|---|---|
| Manipulate parameters that affect the connection to the remote resource. | Interact with the resource; query header fields and contents. |

---\>   
time

1. The connection object is created by invoking the `openConnection` method on a URL.
2. The setup parameters and general request properties are manipulated.
3. The actual connection to the remote object is made, using the `connect` method.
4. The remote object becomes available. The header fields and the contents of the remote object can be accessed.


The setup parameters are modified using the following methods:

- `setAllowUserInteraction`
- `setDoInput`
- `setDoOutput`
- `setIfModifiedSince`
- `setUseCaches`


and the general request properties are modified using the method:

- `setRequestProperty`


Default values for the `AllowUserInteraction` and
`UseCaches` parameters can be set using the methods
`setDefaultAllowUserInteraction` and
`setDefaultUseCaches`.


Each of the above `set` methods has a corresponding
`get` method to retrieve the value of the parameter or
general request property. The specific parameters and general
request properties that are applicable are protocol specific.


The following methods are used to access the header fields and
the contents after the connection is made to the remote object:

- `getContent`
- `getHeaderField`
- `getInputStream`
- `getOutputStream`


Certain header fields are accessed frequently. The methods:

- `getContentEncoding`
- `getContentLength`
- `getContentType`
- `getDate`
- `getExpiration`
- `getLastModifed`


provide convenient access to these fields. The
`getContentType` method is used by the
`getContent` method to determine the type of the remote
object; subclasses may find it convenient to override the
`getContentType` method.


In the common case, all of the pre-connection parameters and
general request properties can be ignored: the pre-connection
parameters and request properties default to sensible values. For
most clients of this interface, there are only two interesting
methods: `getInputStream` and `getContent`,
which are mirrored in the `URL` class by convenience methods.


More information on the request properties and header fields of
an `http` connection can be found at:
>
> ```
>  http://www.ietf.org/rfc/rfc2616.txt
>  
> ```
Invoking the `close()` methods on the `InputStream` or `OutputStream` of an `URLConnection` after a request may free network resources associated with this instance, unless particular protocol specifications specify different behaviours for it.

<br />

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html#openConnection()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#connect()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContent()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentEncoding()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentLength()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentType()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDate()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getExpiration()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderField(int)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderField(java.lang.String)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getInputStream()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getLastModified()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getOutputStream()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setAllowUserInteraction(boolean)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDefaultUseCaches(boolean)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDoInput(boolean)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDoOutput(boolean)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setIfModifiedSince(long)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setRequestProperty(java.lang.String,%20java.lang.String)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setUseCaches(boolean)`

### Field Summary

|---|---|---|
| protected boolean | [allowUserInteraction](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#allowUserInteraction) | If `true`, this `URL` is being examined in a context in which it makes sense to allow user interactions such as popping up an authentication dialog. |
| protected boolean | [connected](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#connected) | If `false`, this connection object has not created a communications link to the specified URL. |
| protected boolean | [doInput](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#doInput) | This variable is set by the `setDoInput` method. |
| protected boolean | [doOutput](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#doOutput) | This variable is set by the `setDoOutput` method. |
| protected long | [ifModifiedSince](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#ifModifiedSince) | Some protocols support skipping the fetching of the object unless the object has been modified more recently than a certain time. |
| protected [URL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html) | [url](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#url) | The URL represents the remote object on the World Wide Web to which this connection is opened. |
| protected boolean | [useCaches](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#useCaches) | If `true`, the protocol is allowed to use caching whenever it can. |

### Protected Constructor Summary

|---|---|
|   | [URLConnection](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#URLConnection(java.net.URL))([URL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html) url) Constructs a URL connection to the specified URL. |

### Public Method Summary

|---|---|
| void | [addRequestProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#addRequestProperty(java.lang.String,%20java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) value) Adds a general request property specified by a key-value pair. |
| abstract void | [connect](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#connect())() Opens a communications link to the resource referenced by this URL, if such a connection has not already been established. |
| boolean | [getAllowUserInteraction](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getAllowUserInteraction())() Returns the value of the `allowUserInteraction` field for this object. |
| int | [getConnectTimeout](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getConnectTimeout())() Returns setting for connect timeout. |
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [getContent](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContent())() Retrieves the contents of this URL connection. |
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [getContent](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContent(java.lang.Class[]))([Class\[\]](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html) classes) Retrieves the contents of this URL connection. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getContentEncoding](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentEncoding())() Returns the value of the `content-encoding` header field. |
| int | [getContentLength](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentLength())() Returns the value of the `content-length` header field. |
| long | [getContentLengthLong](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentLengthLong())() Returns the value of the `content-length` header field as a long. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getContentType](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentType())() Returns the value of the `content-type` header field. |
| long | [getDate](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDate())() Returns the value of the `date` header field. |
| static boolean | [getDefaultAllowUserInteraction](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDefaultAllowUserInteraction())() Returns the default value of the `allowUserInteraction` field. |
| static [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getDefaultRequestProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDefaultRequestProperty(java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key) *This method is deprecated. The instance specific getRequestProperty method should be used after an appropriate instance of URLConnection is obtained.* |
| boolean | [getDefaultUseCaches](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDefaultUseCaches())() Returns the default value of a `URLConnection`'s `useCaches` flag. |
| boolean | [getDoInput](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDoInput())() Returns the value of this `URLConnection`'s `doInput` flag. |
| boolean | [getDoOutput](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDoOutput())() Returns the value of this `URLConnection`'s `doOutput` flag. |
| long | [getExpiration](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getExpiration())() Returns the value of the `expires` header field. |
| synchronized static [FileNameMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/FileNameMap.html) | [getFileNameMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getFileNameMap())() Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/FileNameMap.html` implementation suitable for guessing a content type based on a URL's "file" component. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getHeaderField](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderField(java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) name) Returns the value of the named header field. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getHeaderField](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderField(int))(int n) Returns the value for the `n`^th^ header field. |
| long | [getHeaderFieldDate](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderFieldDate(java.lang.String,%20long))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) name, long Default) Returns the value of the named field parsed as date. |
| int | [getHeaderFieldInt](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderFieldInt(java.lang.String,%20int))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) name, int Default) Returns the value of the named field parsed as a number. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getHeaderFieldKey](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderFieldKey(int))(int n) Returns the key for the `n`^th^ header field. |
| long | [getHeaderFieldLong](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderFieldLong(java.lang.String,%20long))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) name, long Default) Returns the value of the named field parsed as a number. |
| [Map](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html), [List](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/List.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)\>\> | [getHeaderFields](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderFields())() Returns an unmodifiable Map of the header fields. |
| long | [getIfModifiedSince](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getIfModifiedSince())() Returns the value of this object's `ifModifiedSince` field. |
| [InputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html) | [getInputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getInputStream())() Returns an input stream that reads from this open connection. |
| long | [getLastModified](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getLastModified())() Returns the value of the `last-modified` header field. |
| [OutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/OutputStream.html) | [getOutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getOutputStream())() Returns an output stream that writes to this connection. |
| [Permission](https://developers.google.com/j2objc/javadoc/jre/reference/java/security/Permission.html) | [getPermission](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getPermission())() Returns a permission object representing the permission necessary to make the connection represented by this object. |
| int | [getReadTimeout](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getReadTimeout())() Returns setting for read timeout. |
| [Map](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html), [List](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/List.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)\>\> | [getRequestProperties](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getRequestProperties())() Returns an unmodifiable Map of general request properties for this connection. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getRequestProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getRequestProperty(java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key) Returns the value of the named general request property for this connection. |
| [URL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html) | [getURL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getURL())() Returns the value of this `URLConnection`'s `URL` field. |
| boolean | [getUseCaches](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getUseCaches())() Returns the value of this `URLConnection`'s `useCaches` field. |
| static [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [guessContentTypeFromName](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#guessContentTypeFromName(java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) fname) Tries to determine the content type of an object, based on the specified "file" component of a URL. |
| static [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [guessContentTypeFromStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#guessContentTypeFromStream(java.io.InputStream))([InputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html) is) Tries to determine the type of an input stream based on the characters at the beginning of the input stream. |
| void | [setAllowUserInteraction](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setAllowUserInteraction(boolean))(boolean allowuserinteraction) Set the value of the `allowUserInteraction` field of this `URLConnection`. |
| void | [setConnectTimeout](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setConnectTimeout(int))(int timeout) Sets a specified timeout value, in milliseconds, to be used when opening a communications link to the resource referenced by this URLConnection. |
| synchronized static void | [setContentHandlerFactory](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setContentHandlerFactory(java.net.ContentHandlerFactory))([ContentHandlerFactory](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/ContentHandlerFactory.html) fac) Sets the `ContentHandlerFactory` of an application. |
| static void | [setDefaultAllowUserInteraction](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDefaultAllowUserInteraction(boolean))(boolean defaultallowuserinteraction) Sets the default value of the `allowUserInteraction` field for all future `URLConnection` objects to the specified value. |
| static void | [setDefaultRequestProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDefaultRequestProperty(java.lang.String,%20java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) value) *This method is deprecated. The instance specific setRequestProperty method should be used after an appropriate instance of URLConnection is obtained. Invoking this method will have no effect.* |
| void | [setDefaultUseCaches](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDefaultUseCaches(boolean))(boolean defaultusecaches) Sets the default value of the `useCaches` field to the specified value. |
| void | [setDoInput](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDoInput(boolean))(boolean doinput) Sets the value of the `doInput` field for this `URLConnection` to the specified value. |
| void | [setDoOutput](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDoOutput(boolean))(boolean dooutput) Sets the value of the `doOutput` field for this `URLConnection` to the specified value. |
| static void | [setFileNameMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setFileNameMap(java.net.FileNameMap))([FileNameMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/FileNameMap.html) map) Sets the FileNameMap. |
| void | [setIfModifiedSince](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setIfModifiedSince(long))(long ifmodifiedsince) Sets the value of the `ifModifiedSince` field of this `URLConnection` to the specified value. |
| void | [setReadTimeout](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setReadTimeout(int))(int timeout) Sets the read timeout to a specified timeout, in milliseconds. |
| void | [setRequestProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setRequestProperty(java.lang.String,%20java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) value) Sets the general request property. |
| void | [setUseCaches](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setUseCaches(boolean))(boolean usecaches) Sets the value of the `useCaches` field of this `URLConnection` to the specified value. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [toString](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#toString())() Returns a `String` representation of this URL connection. |

### Inherited Method Summary

From class [java.lang.Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)

|---|---|
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [clone](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#clone())() Creates and returns a copy of this `Object`. |
| boolean | [equals](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#equals(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) obj) Compares this instance with the specified object and indicates if they are equal. |
| void | [finalize](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#finalize())() Invoked when the garbage collector has detected that this instance is no longer reachable. |
| final [Class](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html)\<?\> | [getClass](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#getClass())() Returns the unique instance of `https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html` that represents this object's class. |
| int | [hashCode](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#hashCode())() Returns an integer hash code for this object. |
| final void | [notify](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#notify())() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up. |
| final void | [notifyAll](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#notifyAll())() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [toString](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#toString())() Returns a string containing a concise, human-readable description of this object. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait(long,%20int))(long timeout, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait(long))(long timeout) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait())() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object. |

## Fields

#### protected boolean
**allowUserInteraction**

If `true`, this `URL` is being examined in
a context in which it makes sense to allow user interactions such
as popping up an authentication dialog. If `false`,
then no user interaction is allowed.


The value of this field can be set by the
`setAllowUserInteraction` method.
Its value is returned by the
`getAllowUserInteraction` method.
Its default value is the value of the argument in the last invocation
of the `setDefaultAllowUserInteraction` method.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getAllowUserInteraction()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setAllowUserInteraction(boolean)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDefaultAllowUserInteraction(boolean)`

#### protected boolean
**connected**

If `false`, this connection object has not created a
communications link to the specified URL. If `true`,
the communications link has been established.

#### protected boolean
**doInput**

This variable is set by the `setDoInput` method. Its
value is returned by the `getDoInput` method.


A URL connection can be used for input and/or output. Setting the
`doInput` flag to `true` indicates that
the application intends to read data from the URL connection.


The default value of this field is `true`.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDoInput()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDoInput(boolean)`

#### protected boolean
**doOutput**

This variable is set by the `setDoOutput` method. Its
value is returned by the `getDoOutput` method.


A URL connection can be used for input and/or output. Setting the
`doOutput` flag to `true` indicates
that the application intends to write data to the URL connection.


The default value of this field is `false`.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDoOutput()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDoOutput(boolean)`

#### protected long
**ifModifiedSince**

Some protocols support skipping the fetching of the object unless
the object has been modified more recently than a certain time.


A nonzero value gives a time as the number of milliseconds since
January 1, 1970, GMT. The object is fetched only if it has been
modified more recently than that time.


This variable is set by the `setIfModifiedSince`
method. Its value is returned by the
`getIfModifiedSince` method.


The default value of this field is `0`, indicating
that the fetching must always occur.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getIfModifiedSince()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setIfModifiedSince(long)`

#### protected [URL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html)
**url**

The URL represents the remote object on the World Wide Web to
which this connection is opened.


The value of this field can be accessed by the
`getURL` method.


The default value of this variable is the value of the URL
argument in the `URLConnection` constructor.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getURL()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#url`

#### protected boolean
**useCaches**

If `true`, the protocol is allowed to use caching
whenever it can. If `false`, the protocol must always
try to get a fresh copy of the object.


This field is set by the `setUseCaches` method. Its
value is returned by the `getUseCaches` method.


Its default value is the value given in the last invocation of the
`setDefaultUseCaches` method.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setUseCaches(boolean)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getUseCaches()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDefaultUseCaches(boolean)`

## Protected Constructors

#### protected
**URLConnection**
([URL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html) url)

Constructs a URL connection to the specified URL. A connection to
the object referenced by the URL is not created.

##### Parameters

| url | the specified URL. |
|---|---|

## Public Methods

#### public void
**addRequestProperty**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) value)

Adds a general request property specified by a
key-value pair. This method will not overwrite
existing values associated with the same key.

##### Parameters

| key | the keyword by which the request is known (e.g., "`Accept`"). |
| value | the value associated with it. |
|---|---|

##### Throws

| [IllegalStateException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalStateException.html) | if already connected |
| [NullPointerException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/NullPointerException.html) | if key is null |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getRequestProperties()`

#### public abstract void
**connect**
()

Opens a communications link to the resource referenced by this
URL, if such a connection has not already been established.


If the `connect` method is called when the connection
has already been opened (indicated by the `connected`
field having the value `true`), the call is ignored.


URLConnection objects go through two phases: first they are
created, then they are connected. After being created, and
before being connected, various options can be specified
(e.g., doInput and UseCaches). After connecting, it is an
error to try to set them. Operations that depend on being
connected, like getContentLength, will implicitly perform the
connection, if necessary.

##### Throws

| [SocketTimeoutException](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/SocketTimeoutException.html) | if the timeout expires before the connection can be established |
| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if an I/O error occurs while opening the connection. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#connected`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getConnectTimeout()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setConnectTimeout(int)`

#### public boolean
**getAllowUserInteraction**
()

Returns the value of the `allowUserInteraction` field for
this object.

##### Returns

- the value of the `allowUserInteraction` field for this object.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setAllowUserInteraction(boolean)`

#### public int
**getConnectTimeout**
()

Returns setting for connect timeout.


0 return implies that the option is disabled
(i.e., timeout of infinity).

##### Returns

- an `int` that indicates the connect timeout value in milliseconds

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setConnectTimeout(int)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#connect()`

#### public [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)
**getContent**
()

Retrieves the contents of this URL connection.


This method first determines the content type of the object by
calling the `getContentType` method. If this is
the first time that the application has seen that specific content
type, a content handler for that content type is created:

1. If the application has set up a content handler factory instance using the `setContentHandlerFactory` method, the `createContentHandler` method of that instance is called with the content type as an argument; the result is a content handler for that content type.
2. If no content handler factory has yet been set up, or if the factory's `createContentHandler` method returns `null`, then the application loads the class named:
   >
   > ```
   >          sun.net.www.content.<contentType>
   >      
   > ```
   where \<*contentType*\> is formed by taking the content-type string, replacing all slash characters with a `period` ('.'), and all other non-alphanumeric characters with the underscore character '`_`'. The alphanumeric characters are specifically the 26 uppercase ASCII letters '`A`' through '`Z`', the 26 lowercase ASCII letters '`a`' through '`z`', and the 10 ASCII digits '`0`' through '`9`'. If the specified class does not exist, or is not a subclass of `ContentHandler`, then an `UnknownServiceException` is thrown.

<br />

##### Returns

- the object fetched. The `instanceof` operator should be used to determine the specific kind of object returned.

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if an I/O error occurs while getting the content. |
| [UnknownServiceException](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/UnknownServiceException.html) | if the protocol does not support the content type. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/ContentHandlerFactory.html#createContentHandler(java.lang.String)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentType()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setContentHandlerFactory(java.net.ContentHandlerFactory)`

#### public [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)
**getContent**
([Class\[\]](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html) classes)

Retrieves the contents of this URL connection.

##### Parameters

| classes | the `Class` array indicating the requested types |
|---|---|

##### Returns

- the object fetched that is the first match of the type specified in the classes array. null if none of the requested types are supported. The `instanceof` operator should be used to determine the specific kind of object returned.

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if an I/O error occurs while getting the content. |
| [UnknownServiceException](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/UnknownServiceException.html) | if the protocol does not support the content type. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContent()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/ContentHandlerFactory.html#createContentHandler(java.lang.String)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContent(java.lang.Class[])`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setContentHandlerFactory(java.net.ContentHandlerFactory)`

#### public [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**getContentEncoding**
()

Returns the value of the `content-encoding` header field.

##### Returns

- the content encoding of the resource that the URL references, or `null` if not known.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderField(java.lang.String)`

#### public int
**getContentLength**
()

Returns the value of the `content-length` header field.


**Note** : `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentLengthLong()`
should be preferred over this method, since it returns a `long`
instead and is therefore more portable.

<br />

##### Returns

- the content length of the resource that this connection's URL references, `-1` if the content length is not known, or if the content length is greater than Integer.MAX_VALUE.

#### public long
**getContentLengthLong**
()

Returns the value of the `content-length` header field as a
long.

##### Returns

- the content length of the resource that this connection's URL references, or `-1` if the content length is not known.

#### public [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**getContentType**
()

Returns the value of the `content-type` header field.

##### Returns

- the content type of the resource that the URL references, or `null` if not known.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderField(java.lang.String)`

#### public long
**getDate**
()

Returns the value of the `date` header field.

##### Returns

- the sending date of the resource that the URL references, or `0` if not known. The value returned is the number of milliseconds since January 1, 1970 GMT.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderField(java.lang.String)`

#### public static boolean
**getDefaultAllowUserInteraction**
()

Returns the default value of the `allowUserInteraction`
field.


Ths default is "sticky", being a part of the static state of all
URLConnections. This flag applies to the next, and all following
URLConnections that are created.

##### Returns

- the default value of the `allowUserInteraction` field.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDefaultAllowUserInteraction(boolean)`

#### public static [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**getDefaultRequestProperty**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key)


**This method is deprecated.**   
The instance specific getRequestProperty method
should be used after an appropriate instance of URLConnection
is obtained.
Returns the value of the default request property. Default request
properties are set for every connection.

##### Parameters

| key | the keyword by which the request is known (e.g., "Accept"). |
|---|---|

##### Returns

- the value of the default request property for the specified key.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getRequestProperty(java.lang.String)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDefaultRequestProperty(java.lang.String,%20java.lang.String)`

#### public boolean
**getDefaultUseCaches**
()

Returns the default value of a `URLConnection`'s
`useCaches` flag.


Ths default is "sticky", being a part of the static state of all
URLConnections. This flag applies to the next, and all following
URLConnections that are created.

##### Returns

- the default value of a `URLConnection`'s `useCaches` flag.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDefaultUseCaches(boolean)`

#### public boolean
**getDoInput**
()

Returns the value of this `URLConnection`'s
`doInput` flag.

##### Returns

- the value of this `URLConnection`'s `doInput` flag.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDoInput(boolean)`

#### public boolean
**getDoOutput**
()

Returns the value of this `URLConnection`'s
`doOutput` flag.

##### Returns

- the value of this `URLConnection`'s `doOutput` flag.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDoOutput(boolean)`

#### public long
**getExpiration**
()

Returns the value of the `expires` header field.

##### Returns

- the expiration date of the resource that this URL references, or 0 if not known. The value is the number of milliseconds since January 1, 1970 GMT.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderField(java.lang.String)`

#### public static synchronized [FileNameMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/FileNameMap.html)
**getFileNameMap**
()

Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/FileNameMap.html` implementation suitable for guessing a
content type based on a URL's "file" component.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#guessContentTypeFromName(java.lang.String)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setFileNameMap(java.net.FileNameMap)`

#### public [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**getHeaderField**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) name)

Returns the value of the named header field.


If called on a connection that sets the same header multiple times
with possibly different values, only the last value is returned.

##### Parameters

| name | the name of a header field. |
|---|---|

##### Returns

- the value of the named header field, or `null` if there is no such field in the header.

#### public [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**getHeaderField**
(int n)

Returns the value for the `n`^th^ header field.
It returns `null` if there are fewer than
`n+1`fields.


This method can be used in conjunction with the
`https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderFieldKey(int)` method to iterate through all
the headers in the message.

##### Parameters

| n | an index, where `n>=0` |
|---|---|

##### Returns

- the value of the `n`^th^ header field or `null` if there are fewer than `n+1` fields

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderFieldKey(int)`

#### public long
**getHeaderFieldDate**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) name, long Default)

Returns the value of the named field parsed as date.
The result is the number of milliseconds since January 1, 1970 GMT
represented by the named field.


This form of `getHeaderField` exists because some
connection types (e.g., `http-ng`) have pre-parsed
headers. Classes for that connection type can override this method
and short-circuit the parsing.

##### Parameters

| name | the name of the header field. |
| Default | a default value. |
|---|---|

##### Returns

- the value of the field, parsed as a date. The value of the `Default` argument is returned if the field is missing or malformed.

#### public int
**getHeaderFieldInt**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) name, int Default)

Returns the value of the named field parsed as a number.


This form of `getHeaderField` exists because some
connection types (e.g., `http-ng`) have pre-parsed
headers. Classes for that connection type can override this method
and short-circuit the parsing.

##### Parameters

| name | the name of the header field. |
| Default | the default value. |
|---|---|

##### Returns

- the value of the named field, parsed as an integer. The `Default` value is returned if the field is missing or malformed.

#### public [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**getHeaderFieldKey**
(int n)

Returns the key for the `n`^th^ header field.
It returns `null` if there are fewer than `n+1` fields.

##### Parameters

| n | an index, where `n>=0` |
|---|---|

##### Returns

- the key for the `n`^th^ header field, or `null` if there are fewer than `n+1` fields.

#### public long
**getHeaderFieldLong**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) name, long Default)

Returns the value of the named field parsed as a number.


This form of `getHeaderField` exists because some
connection types (e.g., `http-ng`) have pre-parsed
headers. Classes for that connection type can override this method
and short-circuit the parsing.

##### Parameters

| name | the name of the header field. |
| Default | the default value. |
|---|---|

##### Returns

- the value of the named field, parsed as a long. The `Default` value is returned if the field is missing or malformed.

#### public [Map](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html), [List](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/List.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)\>\>
**getHeaderFields**
()

Returns an unmodifiable Map of the header fields.
The Map keys are Strings that represent the
response-header field names. Each Map value is an
unmodifiable List of Strings that represents
the corresponding field values.

##### Returns

- a Map of header fields

#### public long
**getIfModifiedSince**
()

Returns the value of this object's `ifModifiedSince` field.

##### Returns

- the value of this object's `ifModifiedSince` field.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setIfModifiedSince(long)`

#### public [InputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html)
**getInputStream**
()

Returns an input stream that reads from this open connection.

A SocketTimeoutException can be thrown when reading from the
returned input stream if the read timeout expires before data
is available for read.

##### Returns

- an input stream that reads from this open connection.

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if an I/O error occurs while creating the input stream. |
| [UnknownServiceException](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/UnknownServiceException.html) | if the protocol does not support input. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setReadTimeout(int)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getReadTimeout()`

#### public long
**getLastModified**
()

Returns the value of the `last-modified` header field.
The result is the number of milliseconds since January 1, 1970 GMT.

##### Returns

- the date the resource referenced by this `URLConnection` was last modified, or 0 if not known.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderField(java.lang.String)`

#### public [OutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/OutputStream.html)
**getOutputStream**
()

Returns an output stream that writes to this connection.

##### Returns

- an output stream that writes to this connection.

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if an I/O error occurs while creating the output stream. |
| [UnknownServiceException](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/UnknownServiceException.html) | if the protocol does not support output. |
|---|---|

#### public [Permission](https://developers.google.com/j2objc/javadoc/jre/reference/java/security/Permission.html)
**getPermission**
()

Returns a permission object representing the permission
necessary to make the connection represented by this
object. This method returns null if no permission is
required to make the connection. By default, this method
returns `java.security.AllPermission`. Subclasses
should override this method and return the permission
that best represents the permission required to make a
a connection to the URL. For example, a `URLConnection`
representing a `file:` URL would return a
`java.io.FilePermission` object.

The permission returned may dependent upon the state of the
connection. For example, the permission before connecting may be
different from that after connecting. For example, an HTTP
sever, say foo.com, may redirect the connection to a different
host, say bar.com. Before connecting the permission returned by
the connection will represent the permission needed to connect
to foo.com, while the permission returned after connecting will
be to bar.com.

Permissions are generally used for two purposes: to protect
caches of objects obtained through URLConnections, and to check
the right of a recipient to learn about a particular URL. In
the first case, the permission should be obtained
*after* the object has been obtained. For example, in an
HTTP connection, this will represent the permission to connect
to the host from which the data was ultimately fetched. In the
second case, the permission should be obtained and tested
*before* connecting.

##### Returns

- the permission object representing the permission necessary to make the connection represented by this URLConnection.

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if the computation of the permission requires network or file I/O and an exception occurs while computing it. |
|---|---|

#### public int
**getReadTimeout**
()

Returns setting for read timeout. 0 return implies that the
option is disabled (i.e., timeout of infinity).

##### Returns

- an `int` that indicates the read timeout value in milliseconds

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setReadTimeout(int)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html#read()`

#### public [Map](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html), [List](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/List.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)\>\>
**getRequestProperties**
()

Returns an unmodifiable Map of general request
properties for this connection. The Map keys
are Strings that represent the request-header
field names. Each Map value is a unmodifiable List
of Strings that represents the corresponding
field values.

##### Returns

- a Map of the general request properties for this connection.

##### Throws

| [IllegalStateException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalStateException.html) | if already connected |
|---|---|

#### public [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**getRequestProperty**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key)

Returns the value of the named general request property for this
connection.

##### Parameters

| key | the keyword by which the request is known (e.g., "Accept"). |
|---|---|

##### Returns

- the value of the named general request property for this connection. If key is null, then null is returned.

##### Throws

| [IllegalStateException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalStateException.html) | if already connected |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setRequestProperty(java.lang.String,%20java.lang.String)`

#### public [URL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html)
**getURL**
()

Returns the value of this `URLConnection`'s `URL`
field.

##### Returns

- the value of this `URLConnection`'s `URL` field.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#url`

#### public boolean
**getUseCaches**
()

Returns the value of this `URLConnection`'s
`useCaches` field.

##### Returns

- the value of this `URLConnection`'s `useCaches` field.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setUseCaches(boolean)`

#### public static [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**guessContentTypeFromName**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) fname)

Tries to determine the content type of an object, based
on the specified "file" component of a URL.
This is a convenience method that can be used by
subclasses that override the `getContentType` method.

##### Parameters

| fname | a filename. |
|---|---|

##### Returns

- a guess as to what the content type of the object is, based upon its file name.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentType()`

#### public static [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**guessContentTypeFromStream**
([InputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html) is)

Tries to determine the type of an input stream based on the
characters at the beginning of the input stream. This method can
be used by subclasses that override the
`getContentType` method.


Ideally, this routine would not be needed. But many
`http` servers return the incorrect content type; in
addition, there are many nonstandard extensions. Direct inspection
of the bytes to determine the content type is often more accurate
than believing the content type claimed by the `http` server.

##### Parameters

| is | an input stream that supports marks. |
|---|---|

##### Returns

- a guess at the content type, or `null` if none can be determined.

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if an I/O error occurs while reading the input stream. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html#mark(int)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html#markSupported()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentType()`

#### public void
**setAllowUserInteraction**
(boolean allowuserinteraction)

Set the value of the `allowUserInteraction` field of
this `URLConnection`.

##### Parameters

| allowuserinteraction | the new value. |
|---|---|

##### Throws

| [IllegalStateException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalStateException.html) | if already connected |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getAllowUserInteraction()`

#### public void
**setConnectTimeout**
(int timeout)

Sets a specified timeout value, in milliseconds, to be used
when opening a communications link to the resource referenced
by this URLConnection. If the timeout expires before the
connection can be established, a
java.net.SocketTimeoutException is raised. A timeout of zero is
interpreted as an infinite timeout.

Some non-standard implementation of this method may ignore
the specified timeout. To see the connect timeout set, please
call getConnectTimeout().

**Warning** : If the hostname resolves to multiple IP
addresses, Android's default implementation of `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/HttpURLConnection.html`
will try each in
[RFC 3484](http://www.ietf.org/rfc/rfc3484.txt) order. If
connecting to each of these addresses fails, multiple timeouts will
elapse before the connect attempt throws an exception. Host names
that support both IPv6 and IPv4 always have at least 2 IP addresses.

##### Parameters

| timeout | an `int` that specifies the connect timeout value in milliseconds |
|---|---|

##### Throws

| [IllegalArgumentException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalArgumentException.html) | if the timeout parameter is negative |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getConnectTimeout()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#connect()`

#### public static synchronized void
**setContentHandlerFactory**
([ContentHandlerFactory](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/ContentHandlerFactory.html) fac)

Sets the `ContentHandlerFactory` of an
application. It can be called at most once by an application.


The `ContentHandlerFactory` instance is used to
construct a content handler from a content type


If there is a security manager, this method first calls
the security manager's `checkSetFactory` method
to ensure the operation is allowed.
This could result in a SecurityException.

##### Parameters

| fac | the desired factory. |
|---|---|

##### Throws

| [Error](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Error.html) | if the factory has already been defined. |
| [SecurityException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/SecurityException.html) | if a security manager exists and its `checkSetFactory` method doesn't allow the operation. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/ContentHandlerFactory.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContent()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/SecurityManager.html#checkSetFactory()`

#### public static void
**setDefaultAllowUserInteraction**
(boolean defaultallowuserinteraction)

Sets the default value of the
`allowUserInteraction` field for all future
`URLConnection` objects to the specified value.

##### Parameters

| defaultallowuserinteraction | the new value. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDefaultAllowUserInteraction()`

#### public static void
**setDefaultRequestProperty**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) value)


**This method is deprecated.**   
The instance specific setRequestProperty method
should be used after an appropriate instance of URLConnection
is obtained. Invoking this method will have no effect.
Sets the default value of a general request property. When a
`URLConnection` is created, it is initialized with
these properties.

##### Parameters

| key | the keyword by which the request is known (e.g., "`Accept`"). |
| value | the value associated with the key. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setRequestProperty(java.lang.String,%20java.lang.String)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDefaultRequestProperty(java.lang.String)`

#### public void
**setDefaultUseCaches**
(boolean defaultusecaches)

Sets the default value of the `useCaches` field to the
specified value.

##### Parameters

| defaultusecaches | the new value. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDefaultUseCaches()`

#### public void
**setDoInput**
(boolean doinput)

Sets the value of the `doInput` field for this
`URLConnection` to the specified value.


A URL connection can be used for input and/or output. Set the DoInput
flag to true if you intend to use the URL connection for input,
false if not. The default is true.

##### Parameters

| doinput | the new value. |
|---|---|

##### Throws

| [IllegalStateException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalStateException.html) | if already connected |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#doInput`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDoInput()`

#### public void
**setDoOutput**
(boolean dooutput)

Sets the value of the `doOutput` field for this
`URLConnection` to the specified value.


A URL connection can be used for input and/or output. Set the DoOutput
flag to true if you intend to use the URL connection for output,
false if not. The default is false.

##### Parameters

| dooutput | the new value. |
|---|---|

##### Throws

| [IllegalStateException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalStateException.html) | if already connected |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDoOutput()`

#### public static void
**setFileNameMap**
([FileNameMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/FileNameMap.html) map)

Sets the FileNameMap.


If there is a security manager, this method first calls
the security manager's `checkSetFactory` method
to ensure the operation is allowed.
This could result in a SecurityException.

##### Parameters

| map | the FileNameMap to be set |
|---|---|

##### Throws

| [SecurityException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/SecurityException.html) | if a security manager exists and its `checkSetFactory` method doesn't allow the operation. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/SecurityManager.html#checkSetFactory()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getFileNameMap()`

#### public void
**setIfModifiedSince**
(long ifmodifiedsince)

Sets the value of the `ifModifiedSince` field of
this `URLConnection` to the specified value.

##### Parameters

| ifmodifiedsince | the new value. |
|---|---|

##### Throws

| [IllegalStateException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalStateException.html) | if already connected |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getIfModifiedSince()`

#### public void
**setReadTimeout**
(int timeout)

Sets the read timeout to a specified timeout, in
milliseconds. A non-zero value specifies the timeout when
reading from Input stream when a connection is established to a
resource. If the timeout expires before there is data available
for read, a java.net.SocketTimeoutException is raised. A
timeout of zero is interpreted as an infinite timeout.

Some non-standard implementation of this method ignores the
specified timeout. To see the read timeout set, please call
getReadTimeout().

##### Parameters

| timeout | an `int` that specifies the timeout value to be used in milliseconds |
|---|---|

##### Throws

| [IllegalArgumentException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalArgumentException.html) | if the timeout parameter is negative |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getReadTimeout()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html#read()`

#### public void
**setRequestProperty**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) value)

Sets the general request property. If a property with the key already
exists, overwrite its value with the new value.

NOTE: HTTP requires all request properties which can
legally have multiple instances with the same key
to use a comma-separated list syntax which enables multiple
properties to be appended into a single property.

##### Parameters

| key | the keyword by which the request is known (e.g., "`Accept`"). |
| value | the value associated with it. |
|---|---|

##### Throws

| [IllegalStateException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalStateException.html) | if already connected |
| [NullPointerException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/NullPointerException.html) | if key is `null` |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getRequestProperty(java.lang.String)`

#### public void
**setUseCaches**
(boolean usecaches)

Sets the value of the `useCaches` field of this
`URLConnection` to the specified value.


Some protocols do caching of documents. Occasionally, it is important
to be able to "tunnel through" and ignore the caches (e.g., the
"reload" button in a browser). If the UseCaches flag on a connection
is true, the connection is allowed to use whatever caches it can.
If false, caches are to be ignored.
The default value comes from DefaultUseCaches, which defaults to
true.

##### Parameters

| usecaches | a `boolean` indicating whether or not to allow caching |
|---|---|

##### Throws

| [IllegalStateException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalStateException.html) | if already connected |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getUseCaches()`

#### public [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**toString**
()

Returns a `String` representation of this URL connection.

##### Returns

- a string representation of this `URLConnection`.