org.apache.commons.httpclient.methods
public abstract class ExpectContinueMethod extends HttpMethodBase
This abstract class serves as a foundation for all HTTP methods that support 'Expect: 100-continue' handshake.
The purpose of the 100 (Continue) status (refer to section 10.1.1 of the RFC 2616 for more details) is to allow a client that is sending a request message with a request body to determine if the origin server is willing to accept the request (based on the request headers) before the client sends the request body. In some cases, it might either be inappropriate or highly inefficient for the client to send the body if the server will reject the message without looking at the body.
'Expect: 100-continue' handshake should be used with caution, as it may cause problems with HTTP servers and proxies that do not support HTTP/1.1 protocol.
Since: 2.0beta1
Constructor Summary | |
---|---|
ExpectContinueMethod()
No-arg constructor.
| |
ExpectContinueMethod(String uri)
Constructor specifying a URI.
|
Method Summary | |
---|---|
protected void | addRequestHeaders(HttpState state, HttpConnection conn)
Sets the Expect header if it has not already been set,
in addition to the "standard" set of headers.
|
boolean | getUseExpectHeader() Returns true if the 'Expect: 100-Continue' handshake is activated. |
protected abstract boolean | hasRequestContent()
Returns true if there is a request body to be sent.
|
void | setUseExpectHeader(boolean value) Activates 'Expect: 100-Continue' handshake. |
Since: 2.0
Parameters: uri either an absolute or relative URI
Since: 2.0
Parameters: state the {@link HttpState state} information associated with this method conn the {@link HttpConnection connection} used to execute this HTTP method
Throws: IOException if an I/O (transport) error occurs. Some transport exceptions can be recovered from. HttpException if a protocol exception occurs. Usually protocol exceptions cannot be recovered from.
Deprecated: Use {@link HttpMethodParams}
Returns true if the 'Expect: 100-Continue' handshake is activated. The purpose of the 'Expect: 100-Continue' handshake to allow a client that is sending a request message with a request body to determine if the origin server is willing to accept the request (based on the request headers) before the client sends the request body.
Returns: true if 'Expect: 100-Continue' handshake is to be used, false otherwise.
Since: 2.0beta1
See Also: ExpectContinueMethod HttpMethodParams USE_EXPECT_CONTINUE
Returns: boolean
Since: 2.0beta1
Deprecated: Use {@link HttpMethodParams}
Activates 'Expect: 100-Continue' handshake. The purpose of the 'Expect: 100-Continue' handshake to allow a client that is sending a request message with a request body to determine if the origin server is willing to accept the request (based on the request headers) before the client sends the request body.
The use of the 'Expect: 100-continue' handshake can result in noticable peformance improvement for entity enclosing requests (such as POST and PUT) that require the target server's authentication.
'Expect: 100-continue' handshake should be used with caution, as it may cause problems with HTTP servers and proxies that do not support HTTP/1.1 protocol.
Parameters: value boolean value
Since: 2.0beta1
See Also: ExpectContinueMethod HttpMethodParams USE_EXPECT_CONTINUE