Commits on Dec 14, 2015

1. http2: Support trailer fields …

   This commit adds trailer support in HTTP/2.  In HTTP/1.1, chunked
   encoding must be used to send trialer fields.  HTTP/2 deprecated any
   trandfer-encoding, including chunked.  But trailer fields are now
   always available.
   
   Since trailer fields are relatively rare these days (gRPC uses them
   extensively though), allocating buffer for trailer fields is done when
   we detect that HEADERS frame containing trailer fields is started.  We
   use Curl_add_buffer_* functions to buffer all trailers, just like we
   do for regular header fields.  And then deliver them when stream is
   closed.  We have to be careful here so that all data are delivered to
   upper layer before sending trailers to the application.
   
   We can deliver trailer field one by one using NGHTTP2_ERR_PAUSE
   mechanism, but current method is far more simple.
   
   Another possibility is use chunked encoding internally for HTTP/2
   traffic.  I have not tested it, but it could add another overhead.

   

   tatsuhiro-t committed Dec 14, 2015
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