weaveworks / weave / 2153

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[proxy] rewrote chunked response handler

1) We cannot send "Connection: close", because the fsouza docker client
   expects the tcp socket to stay open between requests.

2) Because we cannot force-close the connection, we can't hijack the
   connection (because go's net/http doesn't let use un-hijack it).

3) Because we need to maintain the individual chunking of messages (for
   docker-py), we can't just copy the response body, as Go will remove and
   re-add the chunking willy-nilly.

Therefore, we have to read each chunk one-by-one, and flush the
ResponseWriter after each one.

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