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Activates 'Expect: 100-Continue' handshake for the
entity enclosing methods. 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.
This parameter expects a value of type
Boolean .
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