GNU libmicrohttpd 1.0 released

We are glad to announce the release of GNU libmicrohttpd v1.0, and future plans for the library.

About GNU libmicrohttpd

GNU libmicrohttpd is a small C library that makes it easy to run an HTTP server as part of another application. GNU libmicrohttpd is free software and an official GNU package.

Key features that distinguish GNU libmicrohttpd from other projects are:

  • C library: fast and small
  • API is expressive and fully reentrant
  • Implementation is HTTP 1.1 compliant
  • HTTP server can listen on multiple ports
  • Various threading modes
  • Three different sockets polling modes
  • Broad platform support
  • Support for IPv4 and IPv6
  • Support for incremental processing of POST data
  • Support for basic and digest authentication
  • Support for TLS (requires libgnutls)

Do not use GNU libmicrohttpd if you are looking for a standalone HTTP server, there are many other projects out there that provide that kind of functionality already. However, if you want to be able to serve HTTP requests from within your C or C++ application, check it out!

GNU libmicrohttpd has been primarily developed by the GNU maintainers Evgeny Grin and Christian Grothoff over the last 16 years with the help of a large community contributing features, bug reports and bug fixes. We are especially grateful for code security audits performed or paid for by Mozilla and Red Hat.


This is the first non-bugfix release since version 0.9.75 and the first ever stable release of GNU libmicrohttpd. It is a huge one with new features and fixes.

The major changes include:
  • Rewritten parsing of clients' requests, fully aligned with current RFCs (9110 and 9112) requirements. Added detailed control of strict or lenient specification enforcement. Application may choose between more compatible mode or more strict and secure mode.
  • Reworked Digest Auth, greater enhanced support for current RFC 7617 features. MHD currently is the only known server-side implementation with support for SHA-512/256, userhash and username in extended notation. At the same time the very old RFC2069 is supported, as well as MD5 and SHA-256.
  • Improved functionality in multi-threading environment, especially with external sockets polling modes.
  • Reworked Basic Auth, adding new convenient API functions.
  • Re-implemented GnuTLS initialisation. Now supported libmicrohttpd-specific system-wide configuration, as well as generic GnuTLS system-wide configuration. Application may adjust settings based on system configuration instead of specifying its own full configuration.
  • Tons of other new functionality and various fixes. For detailed changes see the ChangeLog or Git commit logs.


You can download GNU libmicrohttpd from:

Please report bugs to our bugtracker.

The documentation (including a reference manual and tutorial) can be found at

Future Development

We will now begin work on a 2nd major version of GNU libmicrohttpd. This version will have an easier to use API, add support for HTTP2 and HTTP3, as well as multiple TLS backends. Initial work on this will be done by Taler Operations AG under a commission from the German Sovereign Technology Fund. The Sovereign Tech Fund supports the development, improvement, and maintenance of open digital infrastructure. Its goal is to sustainably strengthen the Free Software ecosystem, focusing on security, resilience, technological diversity, and the people behind the code. The result will of course be Free Software and continue to be released under the Lesser GNU General Public License.

If you are interested in commercial support or would like to financially support our development, please contact us. We would like to see if we can transition from purely volunteer work to paid work to accelerate development. We would especially like to hear from you if your business might be interested in purchasing (CE) certifications for GNU libmicrohttpd (say for compliance with the EU Cyber Resilience Act). That would help Taler Operations AG to assess this potential business case.

Of course we will continue our best to provide gratis support -- but no warranties -- to developers via the GNU libmicrohttpd mailing-list.

Happy hacking!

Evgeny & Christian