This commit removes frontend-tls parameter, and adds
redirect-if-not-tls parameter parameter to --backend option. nghttpx
now responds to the request with 308 status code to redirect the
request to https URI if frontend connection is not TLS encrypted, and
redirect-if-no-tls parameter is used in --backend option. The port
number in Location header field is 443 by default (thus omitted), but
it can be configurable using --redirect-https-port option.
Previously, we have dedicated read buffer for each frontend
connection. With this commit, the buffer spaces are only used when
needed, and pooled if they are not used. This reduces memory usage
for idle client connections.
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.
For HTTP/2, read timer starts when there is no downstream, and timer
stops when there is at least one downstream. For HTTP/1, read timer
starts when request handling finished, and timer stops when request
handling starts.
It is very hard to support multiple protocols in backend while
retaining multiple mode settings. Therefore, we dropped modes except
for default and HTTP/2 proxy mode. The other removed modes can be
emulated using combinations of options. Now the backend connection is
not encrypted by default. To enable encryption on backend connection,
use --backend-tls option.
This might help throughput, but it interfere stream priority. The
throughput issue is generally caused by the small buffer size to store
response body, which was 16K. We increased it to 128K to compensate
this change.
Tatsuhiro Tsujikawa