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yhirose
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The server wrote 100 Continue as soon as it saw the expectation, before pre_routing_handler, pre_request_handler, or routing ran. A request those handlers rejected, or one that matched no route, still invited the client to send a body the server would never read. Defer the interim response until the body is about to be read. If the request is answered without reading the body, 100 Continue is never sent and the connection is closed, since whether and when the client sends the body is unknown. Also treat a 417 returned by expect_100_continue_handler as the final response. It used to be written as a bare status line, after which the request was processed and a second response was written.
