Used application specified grow size instead of MHD default size.
When free space is becoming low first try to increase free space
to exact increment value before switching to "low memory" mode.
* merged test_get, test_get_chunked, test_put
* fixed use of header instead of footer in chunked data callback
* added checks for results of all used MHD functions
* added reading of all data in the input buffer provided by MHD for
callback
* re-used libcurl handles to re-use connections in all modes
* added testing of 'poll' and 'epoll' for all tests
* removed the need for socat
* removed forking with potential forked process zombies
* fixed processing only of the first request (as soon as socat
connection become broken, all following requests went to nowhere)
* implemented correct response for unsupported methods
* used proper timeout for 'external select()' (taken into account
libcurl timeout too)
* added check for extra reply data
* added debug print of libcurl sent and received data
* merged all tests into single source file
* fixed a lot of compiler warnings
* added check for incorrect replies produced by MHD
* The new algorithm parse the headers in one pass (including folded
headers) thus multiple passes over the same memory area are avoided
(efficiency for large headers should be improved).
* Strict implementation of RFC 9110 and 9112 requirements, including
replacing or reporting error for unacceptable characters.
* Implemented various levels of strictness for requests interpretations:
three levels within RFC requirements (more strict and more secure; less
strict and more compatible with various clients; balanced (default)),
one more relaxed level with violation of RFC's SHOULD/SHOULD NOT,
one even more relaxed level with violation of MUST/MUST NOT,
one stricter level then required by RFC, but absolutely compatible with
clients following RFC's MUST/MUST NOT, and one more even stricter level
compatible with clients following both MUST/MUST NOT and
SHOULD/SHOULD NOT.
* Added detection and handling of more erroneous situations, like space
at the start of the first line (as recommended by RFC).
* Added more detailed responses for invalid requests with descriptions
of the found problems (as recommended by RFC).
* If many chars have been replaced, only summary is reported instead
of flooding logs with messages when request is badly constructed.
* Whitespaces in headers values are trimmed at start and at the end. No
need to handle extra spaces in the app or when using headers in other
MHD parts, like cookie parsing.
* In overall: increased flexibility, the security must be improved,
much better compliance with the standards.
