nghttp2

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

nghttp2
Original author(s)Tatsuhiro Tsujikawa
Stable release
1.52.0 / 2023-02-13
Repository
Written inC
PlatformmacOS, Windows, POSIX
TypeHTTP/2 implementation
LicenseMIT License
Websitenghttp2.org Edit this on Wikidata

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.[1][2]

Several well-known projects use nghttp2 to implement HTTP/2, including Apache and cURL.[3][4]

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_INITAL_WINDOW_SIZE 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.[5]

Tools

nghttp2 offers multiple tools. nghttp is a command-line tool that uses nghttp2 to output HTTP/2 messages from a URL.[6] nghttp's dependency-based priority is based on Firefox; when a connection is established, nghttp sends five PRIORITY frames.[7] 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.[8]

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.[9]

References

Citations

  1. Pollard 2019, p. 18.
  2. "nghttp2 - HTTP/2 C Library". nghttp2. Retrieved March 19, 2023.
  3. Pollard 2019, p. 347.
  4. Ludin & Garza 2017, p. 112.
  5. Pollard 2019, p. 233.
  6. Pollard 2019, p. 116.
  7. Pollard 2019, p. 128.
  8. Ludin & Garza 2017, p. 110.
  9. "The nghttp3 programmers' guide". nghttp2. 2020. Retrieved March 19, 2023.

Bibliography

  • Ludin, Stephen; Garza, Javier (2017). Learning HTTP/2: A Practical Guide for Beginners. Sebastopol: O'Reilly Media. ISBN 9781491962619.
  • Pollard, Barry (2019). HTTP/2 in Action. Shelter Island: Manning Publications. ISBN 9781638352334.
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