Previously we wrongly handles stream per connection when h2 backend
failed or closed. If upstream is h2 or spdy, streams which are not
associated to the failed h2 backend are also handled, which is
unnecessary.
We added --frontend-http2-window-size,
--frontend-http2-connection-window-size, --backend-http2-window-size,
and --backend-http2-connection-window-size option to replace existing
*-bits options. The old options are not flexible because they only
specify number of bits. Now we can specify integer value, with
possible g, m, and k unit. The old options are still available for
backend compatibility, but are deprecated.
std::make_shared in Xcode 7, 7.1, and 7.2 does not perform
value-initialization, and causes undefined behaviour if struct does
not have user defined default constructor. This workaround explicitly
defines user defined default constructor, and initializes values.
There is a discussion in httpbis mailing list which argues that
dependency tree is for client, and changing it in server side is not
what client expects.
https://lists.w3.org/Archives/Public/ietf-http-wg/2016JulSep/0416.html
Currently, we make pushed stream depend on the parent stream of
associated stream (that is main HTML in most of the cases), so that
associated stream and pushed stream become siblings. In this case, we
also observed that these resources complete each other to get its
parent weight. This means that the delivery of associated stream is
delayed by pushed streams.
So at this moment, it is not a good idea to change pushed stream
priority in a way we do currently.
This commit also fixes the bug that old configuration is still used
for worker process. The another bug fix is that inherited, but not
used fd is not closed in worker process. That makes reloading next
configuration fail if it contains the address which are leaked into
worker process.
This commit implements configuration reloading with SIGHUP.
There are rough edges left:
* Rename SignalServer with more meaningful name, say, WorkerProcess.
* We should introduce global configuration object which is not
affected by configuration reloading. It should hold cmdcfgs, argc,
argv, and last worker PID.
* We should close the listener file descriptor when some operation was
failed after that.
Tatsuhiro Tsujikawa