This commit makes the server-side code polite.
It fixes the error handling code on the server side and fixes
returning error code in responses (there was a nasty bug which could
potentially crash the server).
Also, in this commit we limit max size POST request data to 96K, max
processed data size in headers to 128K (should be enough to handle any
GET requests).
If these limits are surpassed, server will terminate the request with
RST_STREAM without responding with error code. Otherwise it politely
responds with error code.
This commit also limits number of concurrent HTTP/2 streams per
transport connection on server to 100 (as nghttp2 advises by default).
Ideally, these parameters should be configurable both globally and per
every HTTP endpoint description in the configuration file, but for now
putting sane limits should be enough.
Artem Boldariev
71668437d4