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This allows using IO::Splice.copy_stream from the "io_splice"
RubyGem on recent Linux systems. This also allows users to
disable copy_stream usage entirely and use traditional
response_body.each calls which are compatible with all Rack
servers (to workaround bugs in IO.copy_stream under 1.9.2-p180).
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IO#trysendfile does not raise exceptions for common EAGAIN
errors, making it far less expensive to use with the following
concurrency models:
* Coolio
* CoolioFiberSpawn
* Revactor
* FiberSpawn
* FiberPool
This requires the new sendfile 1.1.0 RubyGem and removes support
for the sendfile 1.0.0. All sendfile users must upgrade or be
left without sendfile(2) support. IO#sendfile behaves the same
if you're using a multi-threaded concurrency option, but we
don't detect nor use it unless IO#trysendfile exists.
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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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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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Use a consistent "Client" naming to reduce confusion
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