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unicorn 5 will only support Ruby 1.9.3 and later, so remove
some checks for Hash#compare_by_identity and IO.copy_stream
which we know exist in Ruby 1.9.
Favor &:sym proc dispatch to avoid unnecessary captures and
bytecode size increases, too.
Finally, ensure we fail fast by converting some literal
hashes to use non-arrow syntax for symbolic keys.
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Hopefully makes things easier to try out.
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There's actually no reason we can't have these methods
in Rainbows::Configurator where it's easier to document
nowadays.
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There is one incompatible change: We no longer assume application
authors are crazy and use strangely-cased headers for "Content-Length",
"Transfer-Encoding", and "Range". This allows us to avoid the
case-insensitivity of Rack::Utils::HeaderHash for a speed boost on the
few apps that already serve thousands of requests/second per-worker.
:Coolio got "async.callback" support like :EventMachine, but it
currently lacks EM::Deferrables which would allow us to call
"succeed"/"fail" callbacks. This means only one-shot response writes
are supported.
There are numerous internal code cleanups and several bugfixes for
handling partial static file responses.
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Rack::Utils::HeaderHash is still very expensive in Rack 1.2,
especially for simple things that we want to run as fast as
possible with minimal interference. HeaderHash is unnecessary
for most requests that do not send Content-Range in responses.
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For consistency with the EventMachine code
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We use Cool.io internally everywhere now, but preserve
Rev-based models for anybody using them.
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This is also our website, so we need to document the new
Cool.io-based concurrency options for users and point
existing Rev* users to it.
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Cool.io is the new name for Rev. We'll continue to support Rev
until Cool.io breaks backwards compatibility. Rev may not be
supported if Cool.io is.
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