http: improve AWS HTTP v4 Signature auth

- Add support services without region and service prefixes in
the URL endpoint (ex. Min.IO, GCP, Yandex Cloud, Mail.Ru Cloud Solutions, etc)

http: improve AWS HTTP v4 Signature auth

- Add support services without region and service prefixes in
the URL endpoint (ex. Min.IO, GCP, Yandex Cloud, Mail.Ru Cloud Solutions, etc)
by providing region and service parameters via aws-sigv4 option.
- Add [:region[:service]] suffix to aws-sigv4 option;
- Fix memory allocation errors.
- Refactor memory management.
- Use Curl_http_method instead() STRING_CUSTOMREQUEST.
- Refactor canonical headers generating.
- Remove repeated sha256_to_hex() usage.
- Add some docs fixes.
- Add some codestyle fixes.
- Add overloaded strndup() for debug - curl_dbg_strndup().
- Update tests.

Closes #6524

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hyper: fix CONNECT to set 'data' as userdata

Follow-up to 14e075d1a7fd

connect: fix compile errors in `Curl_conninfo_local`

.. for the `#else` (`!HAVE_GETSOCKNAME`) case

Fixes https://github.com/curl/curl/issues/6548
Closes #6549

Signed-of

connect: fix compile errors in `Curl_conninfo_local`

.. for the `#else` (`!HAVE_GETSOCKNAME`) case

Fixes https://github.com/curl/curl/issues/6548
Closes #6549

Signed-off-by: Layla <layla@insightfulvr.com>

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transfer: fix GCC 10 warning with flag '-Wint-in-bool-context'

... and return the error code from the Curl_mime_rewind call.

Closes #6537

avoid warning: enum constant in boolean context

copyright: fix missing year (range) updates

RELEASE-NOTES: synced

openssl: lowercase the hostname before using it for SNI

... because it turns out several servers out there don't actually behave
correctly otherwise in spite of the fact that the SNI fie

openssl: lowercase the hostname before using it for SNI

... because it turns out several servers out there don't actually behave
correctly otherwise in spite of the fact that the SNI field is
specifically said to be case insensitive in RFC 6066 section 3.

Reported-by: David Earl
Fixes #6540
Closes #6543

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KNOWN_BUGS: cmake: ExternalProject_Add does not set CURL_CA_PATH

Closes #6313

KNOWN_BUGS: Multi perform hangs waiting for threaded resolver

Closes #4852

KNOWN_BUGS: "pulseUI VPN client" is known to be buggy

First entry in the new section "applications" for known problems in
libcurl using applications.

Closes #6306

tool_writeout: make %{errormsg} blank for no errors

Closes #6539

build: fix djgpp builds

- Update build instructions in packages/DOS/README

- Extend 'VPATH' with 'vquic' and 'vssh'.

- Allow 'Makefile.dist' to build both 'lib' and 'src'.

build: fix djgpp builds

- Update build instructions in packages/DOS/README

- Extend 'VPATH' with 'vquic' and 'vssh'.

- Allow 'Makefile.dist' to build both 'lib' and 'src'.

- Allow using the Windows hosted djgpp cross compiler to build for MSDOS
under Windows.

- 'USE_SSL' -> 'USE_OPENSSL'

- Added a 'link_EXE' macro. Etc, etc.

- Linking 'curl.exe' needs '$(CURLX_CFILES)' too.

- Do not pick-up '../lib/djgpp/*.o' files. Recompile locally.

- Generate a gzipped 'tool_hugehelp.c' if 'USE_ZLIB=1'.

- Remove 'djgpp-clean'

- Adapt to new C-ares directory structure

- Use conditional variable assignments

Clarify the 'conditional variable assignment' in 'common.dj'.

Closes https://github.com/curl/curl/pull/6382

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hyper: fix typo in c-hyper.c

settting -> setting

Closes #6538

libssh2: fix CURL_LIBSSH2_DEBUG-enabled build

Follow-up to 2dcc940959772a

Reported-by: Gisle Vanem
Bug: https://github.com/curl/curl/commit/2dcc940959772a652f6813fb6bd3092095a48

libssh2: fix CURL_LIBSSH2_DEBUG-enabled build

Follow-up to 2dcc940959772a

Reported-by: Gisle Vanem
Bug: https://github.com/curl/curl/commit/2dcc940959772a652f6813fb6bd3092095a4877b#commitcomment-46420088

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asyn-thread: fix build for when getaddrinfo missing

This is a follow-up to 8315343 which several days ago moved the resolver
pointer into the async struct but did not update the code tha

asyn-thread: fix build for when getaddrinfo missing

This is a follow-up to 8315343 which several days ago moved the resolver
pointer into the async struct but did not update the code that uses it
when getaddrinfo is not present.

Closes https://github.com/curl/curl/pull/6536

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urldata: move 'ints' to the end of 'connectdata'

To optimize storage slightly.

Closes #6534

urldata: store ip version in a single byte

Closes #6534

urldata: remove duplicate 'upkeep_interval_ms' from connectdata

... and rely only on the value already set in Curl_easy.

Closes #6534

urldata: remove 'local_ip' from the connectdata struct

As the info is already stored in the transfer handle anyway, there's no
need to carry around a duplicate buffer for the life-time o

urldata: remove 'local_ip' from the connectdata struct

As the info is already stored in the transfer handle anyway, there's no
need to carry around a duplicate buffer for the life-time of the handle.

Closes #6534

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urldata: remove duplicate port number storage

... and use 'int' for ports. We don't use 'unsigned short' since -1 is
still often used internally to signify "unknown value" and 0 - 65535

urldata: remove duplicate port number storage

... and use 'int' for ports. We don't use 'unsigned short' since -1 is
still often used internally to signify "unknown value" and 0 - 65535 are
all valid port numbers.

Closes #6534

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urldata: remove the duplicate 'ip_addr_str' field

... as the numerical IP address is already stored and kept in 'primary_ip'.

Closes #6534

select: convert Curl_select() to private static function

The old function should not be used anywhere anymore (the only remaining
gskit use has to be fixed to instead use Curl_poll or no

select: convert Curl_select() to private static function

The old function should not be used anywhere anymore (the only remaining
gskit use has to be fixed to instead use Curl_poll or none at all).

The static function version is now called our_select() and is only built
if necessary.

Closes #6531

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Curl_chunker: shrink the struct

... by removing a field, converting the hex index into a byte and
rearranging the order. Cuts it down from 48 bytes to 32 on x86_64.

Closes #6527

curl: include the file name in --xattr/--remote-time error msgs