Previously, for Via, X-Forwarded-For, and X-Forwarded-Proto header
field, nghttpx only forwarded the last header field of each. With
this commit, nghttpx forwards all of them if it is configured to do
so.
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.
By default, as RFC 7540 calls for, pushed stream depends on its
associated (parent) stream. There are some situations that this is
sub-optimal. For example, if associated stream is HTML, and server is
configured to push css and javascript files which are in critical
rendering path. Then the default priority scheme is sub-optimal,
since browser typically blocks rendering while waiting for critical
resources. In this case, it is better to at least give pushed stream
the same priority of associated stream, and interleave these streams.
This change gives pushed stream the same priority of associated stream
if pushed stream has content-type "application/javascript" or
"text/css". The pushed stream now depends on the stream which
associated stream depends on. We use the same weight of associated
stream.
-b option syntax is now <HOST>,<PORT>[;<PATTERN>[:...]]. The optional
<PATTERN>s specify the request host and path it is used for. The
<PATTERN> can contain path, host + path or host. The matching rule is
closely designed to ServeMux in Go programming language.
nghttpx server push is initiated by looking for Link header field from
backend server response. Currently we only enable server push for
HTTP/1 backend and without HTTP/2 proxy mode. The URIs which have
rel=preload are eligible to resource to be pushed.
Tatsuhiro Tsujikawa