The chunk-length when using chunked encoding streaming mode for output. A value of -1 means chunked encoding is disabled for output.

since

1.5

The fixed content-length when using fixed-length streaming mode. A value of -1 means fixed-length streaming mode is disabled for output.

since

1.5

If true, the protocol will automatically follow redirects. If false, the protocol will not automatically follow redirects.

This field is set by the setInstanceFollowRedirects method. Its value is returned by the getInstanceFollowRedirects method.

Its default value is based on the value of the static followRedirects at HttpURLConnection construction time.

See also

setInstanceFollowRedirects(boolean), getInstanceFollowRedirects(), setFollowRedirects(boolean)

HTTP Status-Code 500: Internal Server Error.

deprecated

it is misplaced and shouldn't have existed.

Constructor for the HttpURLConnection.

u

the URL

Indicates if the connection is going through a proxy.

return

a boolean indicating if the connection is using a proxy.

This method is used to enable streaming of a HTTP request body without internal buffering, when the content length is not known in advance. In this mode, chunked transfer encoding is used to send the request body. Note, not all HTTP servers support this mode.

When output streaming is enabled, authentication and redirection cannot be handled automatically. A HttpRetryException will be thrown when reading the response if authentication or redirection are required. This exception can be queried for the details of the error.

This method must be called before the URLConnection is connected.

chunklen	The number of bytes to write in each chunk. If chunklen is less than or equal to zero, a default value will be used.
Throws	IllegalStateException: if URLConnection is already connected or if a different streaming mode is already enabled.
since	1.5
See also	setFixedLengthStreamingMode(int)

Returns the error stream if the connection failed but the server sent useful data nonetheless. The typical example is when an HTTP server responds with a 404, which will cause a FileNotFoundException to be thrown in connect, but the server sent an HTML help page with suggestions as to what to do.

This method will not cause a connection to be initiated. If the connection was not connected, or if the server did not have an error while connecting or if the server had an error but no error data was sent, this method will return null. This is the default.

return

an error stream if any, null if there have been no errors, the connection is not connected or the server sent no useful data.

This method is used to enable streaming of a HTTP request body without internal buffering, when the content length is known in advance.

An exception will be thrown if the application attempts to write more data than the indicated content-length, or if the application closes the OutputStream before writing the indicated amount.

When output streaming is enabled, authentication and redirection cannot be handled automatically. A HttpRetryException will be thrown when reading the response if authentication or redirection are required. This exception can be queried for the details of the error.

This method must be called before the URLConnection is connected.

contentLength	The number of bytes which will be written to the OutputStream.
Throws	IllegalStateException: if URLConnection is already connected or if a different streaming mode is already enabled.
Throws	IllegalArgumentException: if a content length less than zero is specified.
since	1.5
See also	setChunkedStreamingMode(int)

Sets whether HTTP redirects (requests with response code 3xx) should be automatically followed by this class. True by default. Applets cannot change this variable.

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.

set	a boolean indicating whether or not to follow HTTP redirects.
Throws	SecurityException: if a security manager exists and its checkSetFactory method doesn't allow the operation.
See also	checkSetFactory, getFollowRedirects()

Returns a boolean indicating whether or not HTTP redirects (3xx) should be automatically followed.

return	true if HTTP redirects should be automatically followed, false if not.
See also	setFollowRedirects(boolean)

Returns the value for the n^th header field. Some implementations may treat the 0^th header field as special, i.e. as the status line returned by the HTTP server.

This method can be used in conjunction with the getHeaderFieldKey method to iterate through all the headers in the message.

n	an index, where n>=0.an index, where n>=0.
return	the value of the nth header field, or null if the value does not exist.
See also	getHeaderFieldKey(int)

Returns the key for the n^th header field. Some implementations may treat the 0^th header field as special, i.e. as the status line returned by the HTTP server. In this case, getHeaderField(0) returns the status line, but getHeaderFieldKey(0) returns null.

n	an index, where n >=0.an index, where n >=0.
return	the key for the nth header field, or null if the key does not exist.

Sets whether HTTP redirects (requests with response code 3xx) should be automatically followed by this HttpURLConnection instance.

The default value comes from followRedirects, which defaults to true.

followRedirects	a boolean indicating whether or not to follow HTTP redirects.
since	1.3
See also	instanceFollowRedirects, getInstanceFollowRedirects

Returns the value of this HttpURLConnection's instanceFollowRedirects field.

return	the value of this HttpURLConnection's instanceFollowRedirects field.
since	1.3
See also	instanceFollowRedirects, setInstanceFollowRedirects(boolean)

Set the method for the URL request, one of:

• GET
• POST
• HEAD
• OPTIONS
• PUT
• DELETE
• TRACE

are legal, subject to protocol restrictions. The default method is GET.

method	the HTTP method
Throws	ProtocolException: if the method cannot be reset or if the requested method isn't valid for HTTP.
See also	getRequestMethod()

Get the request method.

return	the HTTP request method
See also	setRequestMethod(java.lang.String)

Gets the status code from an HTTP response message. For example, in the case of the following status lines:

 HTTP/1.0 200 OK
 HTTP/1.0 401 Unauthorized
 

It will return 200 and 401 respectively. Returns -1 if no code can be discerned from the response (i.e., the response is not valid HTTP).

Throws	IOException: if an error occurred connecting to the server.
return	the HTTP Status-Code, or -1

Gets the HTTP response message, if any, returned along with the response code from a server. From responses like:

 HTTP/1.0 200 OK
 HTTP/1.0 404 Not Found
 

Extracts the Strings "OK" and "Not Found" respectively. Returns null if none could be discerned from the responses (the result was not valid HTTP).

Throws	IOException: if an error occurred connecting to the server.
return	the HTTP response message, or null