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First, httpbin.org was having some high latency (load) earlier today,
so we needed to bump the timeout up.
Next, this also uncovered a bug where our cancellation of http channels
was a bit dodgy. This is changed to be a bit more robust, separating the
"current" active http streams (for read or write) into separate tracking
variables variables. Also, now cancellation immediately calls the aio
finish for those -- there were assumptions elsewhere (expire timeouts)
that cancellation caused nni_aio_finish() to be called.
Finally there was a use after free bug in the websocket listener code
where the listener could be freed while still having outstanding streams
waiting to send the websocket reply.
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This addresses a number of problems that were found on Windows,
including one bug that actually turned up in testing on POSIX.
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This is a rather large changeset -- it fundamentally adds websocket
transport, but as part of this changeset we added a generic framework
for both HTTP and websocket. We also made some supporting changes to
the core, such as changing the way timeouts work for AIOs and adding
additional state keeping for AIOs, and adding a common framework for
deferred finalization (to avoid certain kinds of circular deadlocks
during resource cleanup). We also invented a new initialization framework
so that we can avoid wiring in knowledge about them into the master
initialization framework.
The HTTP framework is not yet complete, but it is good enough for simple
static serving and building additional services on top of -- including
websocket. We expect both websocket and HTTP support to evolve
considerably, and so these are not part of the public API yet.
Property support for the websocket transport (in particular address
properties) is still missing, as is support for TLS.
The websocket transport here is a bit more robust than the original
nanomsg implementation, as it supports multiple sockets listening at
the same port sharing the same HTTP server instance, discriminating
between them based on URI (and possibly the virtual host).
Websocket is enabled by default at present, and work to conditionalize
HTTP and websocket further (to minimize bloat) is still pending.
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