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On FreeBSD 9.0, "wc -l" emits leading whitespace, so
filter it through tr -d '[:space:]' to eliminate it.
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This doesn't use Rainbows::Base so we have no keepalive support
at all. This could eventually be an option for streaming
applications.
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Since TCP sockets stream, HTTP requests do not come in at
well-defined boundaries and it's possible for pipelined requests
to come in in a staggered form. We need to ensure our
receive_data callback doesn't fire any actions at all while
responding with a deferrable @body.
We still need to be careful about buffering, since EM does not
appear to allow temporarily disabling read events (without
pausing writes), so we shutdown the read end of the socket
if it reaches a maximum header size limit.
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EM::FileStreamer writes may be intermingled with the headers
in the subsequent response if we enable processing of the
second pipelined response right away, so wait until the
first response is complete before hitting the second one.
This also avoids potential deep stack recursion in the unlikely
case where too many requests are pipelined.
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With sendfile enabled, we must avoid writing headers (or normal,
non-file responses) while a file is deferred for sending. This
means we must disable processing of new requests while a file
is deferred for sending and use the on_write_complete callback
less aggressively.
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