Libevent Openssl filter is very inconvenient in various respect. The
most annoying thing is it somehow emits data when SSL_shutdown is
called. The reason we introduced this filter solution is drop
connection if TLS renegotiation is detected. This commit implements
renegotiation detection and drop connection without filtering.
Cipher suites are chosen by DHE and ECDHE ciphers + GCM (AEAD). Now
default cipher list is the one recommended by Mozilla web site. The
--honor-cipher-order option is removed and now it is always assumed.
ALTSVC and BLOCKED frames are now extension frames. To add new
extension frame without modifying nghttp2_frame union, which causes so
name bump, we separated extension frames from core frames.
nghttp2_frame includes generic nghttp2_extension. The payload member
of nghttp2_extension will point to the structure of extension frame
payload. The frame types of extension frames are defined in
nghttp2_ext_frame_type.
Previously, we use evbuffer_pullup(buf, -1) to linearize the memory
region and it may cause buffer copy. To avoid this, we use the return
value of evbuffer_get_contiguous_space() as 2nd parameter. According
to the libevent manual, by doing so evbuffer_pullup() will not copy or
modify any data in evbuffer.
It seems that specifyig '*' to node parameter in getaddrinfo() is
treated as specifying NULL, but it is not documented. So rather than
relying on this feature, we explicitly treat '*' as "wildcard" address
and specify NULL to node parameter in getaddrinfo().
Now '*,3000' is a default value of --frontend option. Specyfing '*'
binds all addresses including both IPv4 and IPv6.
It appears that some Android client does not like Connection: close in
200 CONNECT response. Browsers fine with this header field. It is
better to remove it. Squid does not emit it too.
Previously stream ID was assigned just before HEADERS or PUSH_PROMISE
was serialized and nghttp2_submit_{request, headers, push_promise} did
not return stream ID. The application has to check assigned stream ID
using before_frame_send_callback. Now it is apparent that priority is
meant to DATA transfer only. Also application can reorder the
requests if it wants. Therefore we can assign stream ID in
nghttp2_submit_* functions and return stream ID from them. With this
change, now application does not have to check stream ID using
before_frame_send_callback and its code will be simplified.
Tatsuhiro Tsujikawa
Alexis La Goutte