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Hijackers may capture and reuse `env' indefinitely, so we must
not use it in those cases for future requests. For non-hijack
requests, we continue to reuse the `env' object to reduce
memory recycling.
Reported-and-tested-by: Sam Saffron <sam.saffron@gmail.com>
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Middlewares such as Rack::Lock (used by Rails) break badly unless
the response body is closed on hijack, so we will close it to follow
the lead of other popular Rack servers.
While it's unclear if there's anybody using rack.hijack with unicorn,
we'll try to emulate the behavior of other servers as much as
possible.
ref: https://github.com/ngauthier/tubesock/issues/10
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Once a connection is hijacked, we ignore it completely and leave
the connection at the mercy of the application.
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Rack 1.5.0 (protocol version [1,2]) adds support for
hijacking the client socket (removing it from the control
of unicorn (or any other Rack webserver)).
Tested with rack 1.5.0.
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