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setExpectContinueEnabled is added to get rid of broken pipe exception.
The PUT/POST is sent with a huge payload with the header X-Vulas-Token. If the Token is invalid the server quickly closes the connection, the client still tries to send a payload even when the connection was closed at the server end which causes broken pipe exception. Expect Continue is introduced in HTTP 1.1 and handles this well as it just sends the headers and tries to validate if there is any failure, if there is no failure it sends the whole payload.
ExpectContinue is part of HTTP 1.1 spec
More details - https://hc.apache.org/httpclient-3.x/apidocs/org/apache/commons/httpclient/methods/ExpectContinueMethod.html