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GNU libmicrohttpd 0.9.74 released

From: Evgeny Grin
Subject: GNU libmicrohttpd 0.9.74 released
Date: Sun, 19 Dec 2021 19:11:39 +0300
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.4.0

Dear all,

I'm very glad to finally announce the new release of GNU libmicrohttpd library version 0.9.74.
This release brings a lot of fixes and improvements, and
important new features.
The most significant addition is the new experimental
implementation of WebSockets contributed by David Gausmann. This
implementation is not fully tested yet so currently it is disabled
by default.
Other changes include a lot of improvements and clarifications
in doxy comments in microhttpd.h header file, improved compliance
with the RFC HTTP specifications, the new implementation of reply
header forming, the new implementation of request chunked encoding
parsing, new automatic error replies, internal optimisations, and
many important fixes, including fixes for long-standing bugs.

More detailed list of notable changes:

API changes:
+ Added new function MHD_get_reason_phrase_len_for().
+ Added MHD_CONNECTION_INFO_HTTP_STATUS type of information
  queried by MHD_get_connection_info().
+ Added new response flag MHD_RF_SEND_KEEP_ALIVE_HEADER to force
  sending of "keep-alive" header even if not required by RFC.
+ Added new response creation function
  MHD_create_response_from_buffer_with_free_callback_cls() with
  custom cleanup callback.
+ Added new response flag MHD_RF_HTTP_1_0_COMPATIBLE_STRICT with
  the same functionality as existing MHD_RF_HTTP_VERSION_1_0_ONLY
  flag. The old flag will be deprecated.
+ Added new response flag MHD_RF_HTTP_1_0_SERVER with the same
  functionality as existing MHD_RF_HTTP_VERSION_1_0_RESPONSE flag.
  The old flag will be deprecated.

New features:
+ Added experimental WebSockets extension with separate header.
  Disabled by default as it is not fully tested yet.
+ Added '--enable-sanitizers[=address,undefined,leak,user-poison]'
  configure parameter (instead of '--enable-sanitizer'),
  implemented custom memory poisoning for memory pools.

Improvements and enhancements:
* Doxy function descriptions was corrected, clarified, extended,
  and improved. Now it should be much easier to learn MHD just by
  reading the headers.
* Completely rewritten reply header forming. New implementation is
  more robust, simpler maintainable and expandable, and better
  follows RFC HTTP specifications.
* Performance improvements: now HTTP version and request method are
  decoded one time only (previously MHD used string comparison many
  times during processing the data).
* Rewritten request chunked payload decoding. The new
  implementation better conforms to the HTTP RFC, detects format
  problems earlier, replies to the clients with description of
  detected problems, handles untypical (but syntactically correct)
  values properly.
* Added special replies for wrong/unsupported HTTP versions in
  requests, broken HTTP chunked encoding in requests,
* As required by HTTP RFC, added automatic error replies if client
  used broken chunked encoding, too large chunk size, too large
  payload size, or broken Content-Length header.
* Optimized connection's memory pool handling.
* Changed timeout precision from one second to one millisecond.
* Added some checks for incorrect user data, reporting problems in
  MHD log.
* Improved performance of hash calculations functions by using
  compiler built-ins (if available).
* Implemented SHA-1 calculations (required for WebSockets).
* Added universal MSVC project that works with any (sufficiently
  new) version of MSVC.
* Developed simple HTTP client to test MHD under very special
* Implemented 45 new tests.
* Improved existing tests to test more aspects of MHD.
* Added check for correct results of system and libcurl functions.
* Response headers are checked during forming of responses.
* HTTPS tests were improved.
* Added rebuild on W32 of all required files if files are missing.
* Many internal optimisations and improvements.

Functionality changes:
* Keep-alive header is omitted by default for HTTP/1.1 connections.
  Use of header can be enforced by response flag.
* Chunked encoding is used for HTTP/1.1 non-keep-alive connections
  for responses with unknown size. Previously MHD used "indication
  of the end of the response by closing connection" in such cases,
  however it is not correct for HTTP/1.1 connections as per HTTP
* As required by HTTP RFC, use HTTP/1.1 version instead of HTTP/1.0
  in reply headers when client is HTTP/1.0 . HTTP/1.0 version can
  be enforced by response flag.
* User response headers are used in replies in the same order as
  was added by application.
* Allowed tab characters in response header values.
* All custom "Connection:" response headers are automatically
  combined into single "Connection:" header.
* "keep-alive" token silently dropped from custom "Connection:"
  response header. "Keep-alive" cannot be enforced and used
  automatically if possible.
* Allow tab character in custom response header value.
* Disallow space character in custom response header value.
* Do not allow responses with 1xx codes for HTTP/1.0 requests.
* Detected and reported incorrect "Upgrade" responses.
* W32 targets are changed to Vista+ by default. XP is supported

# Fixed short busy-waiting (up to one second) when connection is
  going to be expired and closed.
# Fixed handling of errors during start of new connection, fixed
  inability to accept new connections in thread-per-connection mode
  due to the missing decrement of number of daemon's connections if
  start of new thread is failed.
# Fixed incorrect parsing of LFLF, LFCR, CRCR, and bare CR as
  single linefeed in request header and request chunked payload.
  Now only CRLF or bare LF are recognized as linefeed.
# Fixed response chunked encoding handling. Now it works properly
  with non-keep-alive connection, with fixed size replies (if
  chunked was enforced by header), and in other situations.
# Other fixes for chunked replies.
# Fixed handling of custom connection timeout in thread-per-
  connection mode.
# Fixed wrongly used MHD_REQUEST_TERMINATED_COMPLETED_OK code for
  application notification when MHD_REQUEST_TERMINATED_WITH_ERROR
  code must be used.
# Fixed code MHD_REQUEST_TERMINATED_READ_ERROR not reported (code
  MHD_REQUEST_TERMINATED_WITH_ERROR was incorrectly used instead).
# Fixed handling of request chunked encoding with untypical
# Fixed processing of last part of hex-encoded values under
  certain conditions.
# Fixed returned value for MHD_FEATURE_AUTOSUPPRESS_SIGPIPE on W32,
  now it is MHD_YES as W32 does not need SIGPIPE suppression.
# Fixed portability of bitwise NOT for enums values.
# Fixed SHA-256 and MD5 calculations with unaligned data.
# Fixed incorrect caseless matching for HTTP version.
# Fixed incorrect caseless matching for request method.
# Fixed compatibility with old GnuTLS versions.
# Fixed compiler warnings on 32-bits platforms.
# Fixed blocking sockets setting in tests and examples for W32.
# Fixed examples to really use libmagic if present.
# HTTPS tests were fixed.
# Fixed libcurl test with case-insensitive match for HTTP methods,
  method names must use case-sensitive match.
# Fixed tests compatibility with old libcurl versions.
# Fixed build on W32 with llvm-dlltool (this tool is too

You can download GNU libmicrohttpd from

* and all GNU FTP mirrors.
* Our git repository at

Please report bugs to our bugtracker at

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

Best Wishes,

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