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Tunnel drops whatever the destination sends right after the proxy's 200, and fixing that in place would change its response type (hyperium#313). HttpConnect does a real CONNECT request over an h1 connection and returns the upgraded IO, so leftover bytes survive via hyper's upgrade buffer. HTTP/1 only for now. Closes hyperium/hyper#4095
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Follow-up to hyperium/hyper#4095: #315 fixed the parsing, but
tunnel()still throws away anything after the header end, which breaks protocols where the server speaks first. Fixing it in place changesTunnel's response type, which is why #313 went nowhere.So this is the alternative @seanmonstar suggested on the issue: a new connector,
HttpConnect, that sends an actual CONNECT request over an h1 connection and returns the upgraded IO, early bytes survive through hyper's own upgrade buffer. The conn future is driven inside the connector future, so nothing needs to be spawned. The returned IO forwardsConnectedso it works with the legacy client.Tunnelitself is untouched except apub(super)on the sharedHeadersenum.HTTP/1 only for now, h2 CONNECT could go behind the same type later.
Closes hyperium/hyper#4095