curl / curl / 8498

37%

Pull #2841

travis-ci

Adding callback to send trailers on PUT requests [1]
Modified the previous solution to do the following:
- Initialize the request trailers state to HTTP_TRAILERS_NONE on creation
- Proceed with the request as usual until there is no more data to be read
  by the read callback
- Enter HTTP_TRAILERS_INITIALIZED state
- On the next call to Curl_fillreadbuffer, move the state to
  HTTP_TRAILERS_SENDING
- Call the callback CURLOPT_HTTPTRAILERS_FUNCTION to get a list of
  trailers to send
- Compile the headers into a Curl_sendbuffer kept in the request state
- While we're in the HTTP_TRAILERS_SENDING state, read from compiled buffer
- If we have depleted the buffer, move the trailers state to
  HTTP_TRAILERS_DONE and return to the next state in the curl state machine.

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