tests: replace hard-coded `/dev/null` with variable

- add variable for the null device filename and use that in Perl code.
- initialize this variable with `NUL` on native Windows.
-

tests: replace hard-coded `/dev/null` with variable

- add variable for the null device filename and use that in Perl code.
- initialize this variable with `NUL` on native Windows.
- add `%DEV_NULL` variable and use it in tests.

Fixes `The system cannot find the path specified.` messages seen when
running `runtests.pl` with native Windows Perl.

Also adjust code to not break mcedit syntax highlighting.

Cherry-picked from #14949
Closes #15098

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tets: testrunner fairness

Collect all ready runners from select() and process in a loop. This
assures fairness in processing among all runners.

Formerly, only the first ready ru

tets: testrunner fairness

Collect all ready runners from select() and process in a loop. This
assures fairness in processing among all runners.

Formerly, only the first ready runner in the list of all was processed,
leading to later runners being delayed in processing and reporting
overly long test durations.

Also, reduce the backend idle timeout for the h2/h3 test servers so that
process shutdowns take less time.

Closes #14967

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tests: use exec when spawning nghttpx

This stops keeping perl and shell processes around that are no longer
needed, plus it eliminates an unneeded shell message when the server is
la

tests: use exec when spawning nghttpx

This stops keeping perl and shell processes around that are no longer
needed, plus it eliminates an unneeded shell message when the server is
later terminated.

Closes #13772

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tests: fix http servers to run with a dynamic log directory

Ref: #10818

tests: HTTP server fixups

- httpserver.pl -> http-server.pl for consistency
- add http3-server.pl to EXTRA_DIST; alphabetise for maintainability
- nghttpx proxy invocation scripts sh

tests: HTTP server fixups

- httpserver.pl -> http-server.pl for consistency
- add http3-server.pl to EXTRA_DIST; alphabetise for maintainability
- nghttpx proxy invocation scripts should not use getcwd

Closes #10568

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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tests: add 3 new HTTP/2 test cases, plus https: support for nghttpx

- a simple https get
- a simple https post
- a multi get of 4 requests and check that same connection was used

tests: add 3 new HTTP/2 test cases, plus https: support for nghttpx

- a simple https get
- a simple https post
- a multi get of 4 requests and check that same connection was used

Closes #10114

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tests: add HTTP/3 test case, custom location for proper nghttpx

- adding support for HTTP/3 test cases via a nghttpx server that is
build with ngtcp2 and nghttp3.
- test2500 is the

tests: add HTTP/3 test case, custom location for proper nghttpx

- adding support for HTTP/3 test cases via a nghttpx server that is
build with ngtcp2 and nghttp3.
- test2500 is the first test case, performing a simple GET.
- nghttpx is checked for support and the 'feature' nghttpx-h3
is set accordingly. test2500 will only run, when supported.
- a specific nghttpx location can be given in the environment
variable NGHTTPX or via the configure option
--with-test-nghttpx=<path>

Extend NGHTTPX config to H2 tests as well

* use $ENV{NGHTTPX} and the configured default also in http2 server starts
* always provide the empty test/nghttpx.conf to nghttpx. as it defaults to
reading /etc/nghttpx/nghttpx.conf otherwise.

Added nghttpx to CI ngtcp2 jobs to run h3 tests.

Closes #9031

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copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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curl.se: new home

Closes #6172

copyright: fix out-of-date copyright ranges and missing headers

Reported by the new script 'scripts/copyright.pl'. The script has a
regex whitelist for the files that don't need copyrigh

copyright: fix out-of-date copyright ranges and missing headers

Reported by the new script 'scripts/copyright.pl'. The script has a
regex whitelist for the files that don't need copyright headers.

Removed three (mostly usesless) README files from docs/

Closes #5141

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tests: enable HTTP/2 tests to run with non-default port numbers

runtests: make stripfile work on stdout as well

... and have test 1700 use that to strip out the nghttpx server: headers

http2-tests: test1700 is the first real HTTP/2 test

It requires that 'nghttpx' is in the PATH, and it will run the tests
using nghttpx as a front-end proxy in front of the standard HTTP/

http2-tests: test1700 is the first real HTTP/2 test

It requires that 'nghttpx' is in the PATH, and it will run the tests
using nghttpx as a front-end proxy in front of the standard HTTP/1 test
server. This uses HTTP/2 over plain TCP.

If you like me have nghttpx installed in a custom path, you can run test 1700
like this:

$ PATH=$PATH:$HOME/build-nghttp2/bin/ ./runtests.pl 1700

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