Reduce http proxy client overhead by 1RTT #2101
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In standard HTTP proxy, client will wait until proxy connects to the destination and send 200 OK back. This introduce 1 RTT overhead. If we send the content right after writing the CONNECT command, this could be eliminated.
As for compatibility, a standard http proxy should be able to separate the command and content by \r\n\r\n. In my test, most proxy server can handle this behavior.