Nghttp2

HTTP/2 library in C From Wikipedia, the free encyclopedia

nghttp2 is a C library. It is an implementation of HTTP/2.

Original authorTatsuhiro Tsujikawa
Initial release2013
Stable release
1.68.0[1] Edit this on Wikidata / 25 October 2025; 4 months ago (25 October 2025)
Written inC
Quick facts Original author, Initial release ...
nghttp2
Original authorTatsuhiro Tsujikawa
Initial release2013
Stable release
1.68.0[1] Edit this on Wikidata / 25 October 2025; 4 months ago (25 October 2025)
Written inC
PlatformmacOS, Windows, POSIX
TypeHTTP/2 implementation
LicenseMIT License
Websitenghttp2.org
Repositorygithub.com/nghttp2/nghttp2
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History

nghttp2 was created by Tatsuhiro Tsujikawa as a derivative of spdylay, an implementation of SPDY, a communications protocol created by Google in 2009, in C.[2][3]

Several well-known projects use nghttp2 to implement HTTP/2, including Apache and cURL.[4][5]

Features

HTTP/2 implementation

nghttp2 will send a WINDOW_UPDATE frame upon consuming more than half of the flow control window. For instance, if the sender specifies the SETTINGS_INITIAL_WINDOW_SIZE [sic] as 65,535 octets in the SETTINGS frame, nghttp2 will send a WINDOW_UPDATE frame upon exceeding 32,768 octets. The initial window size may be changed using the -w and -W flags.[6]

Tools

nghttp2 offers multiple tools. nghttp is a command-line tool that uses nghttp2 to output HTTP/2 messages from a URL.[7] nghttp's dependency-based priority is based on Firefox; when a connection is established, nghttp sends five PRIORITY frames.[8] Other tools provided include nghttpd, an HTTP/2 server, nghttpx, an HTTP/2 proxy, h2load, an HTTP/2 load testing tool, and inflatehd and deflatehd, tools to decompress and compress using the HPACK header compression algorithm.[9]

nghttp3

nghttp3 is an implementation of HTTP/3 in C and authored by Tsujikawa. nghttp3 uses the QUIC network protocol designed by Jim Roskind at Google.[10]

References

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