Package edu.internet2.middleware.grouperClientExt.org.apache.commons.httpclient.methods

Class ExpectContinueMethod

java.lang.Object
edu.internet2.middleware.grouperClientExt.org.apache.commons.httpclient.HttpMethodBase
edu.internet2.middleware.grouperClientExt.org.apache.commons.httpclient.methods.ExpectContinueMethod
All Implemented Interfaces:
HttpMethod
Direct Known Subclasses:
EntityEnclosingMethod, MultipartPostMethod
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 Details

    • ExpectContinueMethod

      public ExpectContinueMethod()
      No-arg constructor.
      Since:
      2.0

    • ExpectContinueMethod

      public ExpectContinueMethod(String uri)
      Constructor specifying a URI.
      Parameters:
      uri - either an absolute or relative URI
      Since:
      2.0

  • Method Details

    • getUseExpectHeader

      public boolean getUseExpectHeader()
      Deprecated.
      Use 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:

    • setUseExpectHeader

      public void setUseExpectHeader(boolean value)
      Deprecated.
      Use 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:

    • hasRequestContent

      protected abstract boolean hasRequestContent()
      Returns true if there is a request body to be sent. 'Expect: 100-continue' handshake may not be used if request body is not present
      Returns:
      boolean
      Since:
      2.0beta1

    • addRequestHeaders

      protected void addRequestHeaders(HttpState state, HttpConnection conn) throws IOException, HttpException
      Sets the Expect header if it has not already been set, in addition to the "standard" set of headers.
      Overrides:
      addRequestHeaders in class HttpMethodBase
      Parameters:
      state - the state information associated with this method
      conn - the 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.
      See Also: