Hey Maru,
that's awesome, great news ! I am looking forward to extend GNU Wget2's test suite to support http/2 :-) We are using MHD for the test suite's server side. Thank you so much for working on this ! Regard, Tim On 30.03.2018 14:48, Maru Berezin wrote: > Hello everyone, > > My name is Maru and in the last few months I've been implementing HTTP2 > support for MHD, as a personal programming project. > > https://github.com/maru/libmicrohttpd-http2 > > I've just finished a first alpha release, so I wanted to share my work > with you. > > Some implementation details: > > - I chose the library nghttp2 for handling the HTTP/2 protocol. It works > with byte strings (input and output), leaving the handling of I/O > operations to the user. It is widely used in other projects, such as > curl and Apache httpd. > > - I wanted to implement HTTP2 in the least "intrusive" way possible. > HTTP2 support is disabled by default, and HTTP2 code is only available > when HTTP2 is enabled. > > - I followed the HTTPS implementation: > - enable HTTP2 in the configure script, > - use #ifdef in the MHD legacy code, > - all the implementation code is in the connection_http2.{c,h} files > (connection_http2_helper.h code is only for debug purposes). > > To test the HTTP2 protocol, I used h2spec > https://github.com/summerwind/h2spec . > It is a conformance testing tool for HTTP/2 implementation. It is > compliant with RFC 7540 (HTTP/2) http://www.rfc-editor.org/rfc/rfc7540.txt > and RFC 7541 (HPACK) http://www.rfc-editor.org/rfc/rfc7541.txt . > > I also modified the existing MHD tests, so the server and client use HTTP2. > > The use of HTTP2 is very simple and straightforward: > - User just adds "MHD_USE_HTTP2" flag when calling MHD_start_daemon. > - HTTP2 server settings can be modified using the MHD_OPTION_H2_SETTINGS > option (see src/examples/minimal_example.c). > > Changes: > - Tests: daemons (and curl clients) run in HTTP1 and HTTP2 mode. > - src/examples/: can enable HTTP2 support with the command line option "-h2". > - Added some functions in src/microhttpd/test_helpers.h > - Example of adding a trailer in src/examples/chunked_example.c > - Implemented TLS-ALPN (allows protocol negotiation during the TLS handshake). > - Added HTTP2 connection states to MHD_CONNECTION_STATE (but not sure of > its usefulness). > > To do: > - Modify the http2_stream structure. It's very ugly and messy... > - Allow HTTP1 upgrades to HTTP2 (right now, MHD only handles one version: > HTTP1 or HTTP2). > - Improve the performance. > - More HTTP2-related tests. > - Handle suspend/resume actions correctly (now implemented for only one > stream). > - Finish the verbose/debugging information of sessions and frames (I like > the format used in nghttp client/server). > > Finally: I pulled all the last commits in libmicrohttpd, and merged them > with my code. All tests and examples were run on Linux and passed! > > I followed the coding style of MHD, but there might be incorrectly > formatted line lengths/variable names/braces. > > How to build MHD with HTTP2 support: > > - First, download the library nghttp2: > > (I used version 1.24.0 for the development, but I also tested MHD with > the last release v1.31.0) > > https://github.com/nghttp2/nghttp2/releases > > The following package is required to build the libnghttp2 library: > pkg-config >= 0.20 > > You can build nghttp2: > > configure --prefix=${PREFIX_DIR} --enable-lib-only > make && make install > > - To run the curl tests, install a curl version 7.49.0 (with newer > releases, some HTTP2 tests fail: test_timeout_http2 and > test_get_response_cleanup_http2. I will investigate). > > https://curl.haxx.se/download/curl-7.49.0.tar.gz > > You can build libcurl: > > configure --prefix=${PREFIX_DIR} --with-nghttp2=${PREFIX_DIR} > --without-ssl --with-gnutls > make && make install > > - Download libmicrohttpd-http2: > > https://github.com/maru/libmicrohttpd-http2/archive/v0.1.0.tar.gz > > - I also set: > > export LD_LIBRARY_PATH=${PREFIX_DIR}/lib > > - To enable HTTP2 in MHD, you need to configure it: > > configure --enable-http2 --with-nghttp2=${PREFIX_DIR} > > - Finally, run: > > make && make check > > All comments, questions, and suggestions are more than welcome! > > Best regards, > Maru >
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