headers: make sure the trailing newline is not stored

extended test1940 to verify blank header fields too

Bug: https://curl.se/mail/lib-2024-01/0019.html
Reported-by: Dmitry Kar

headers: make sure the trailing newline is not stored

extended test1940 to verify blank header fields too

Bug: https://curl.se/mail/lib-2024-01/0019.html
Reported-by: Dmitry Karpov
Closes #12675

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tests/data/test1940: use binary mode for expected stdout

The generated stdout data is written in binary mode with [LF]
line endings, therefore we also need to do a binary comparison.

tests/data/test1940: use binary mode for expected stdout

The generated stdout data is written in binary mode with [LF]
line endings, therefore we also need to do a binary comparison.

Assisted-by: Jay Satiro
Assisted-by: Daniel Stenberg

Follow up to c9b60f005358a364cbcddbebd8d12593acffdd84
Fixes #8920
Closes #8936

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http: restore header folding behavior

Folded header lines will now get passed through like before. The headers
API is adapted and will provide the content unfolded.

Added test 1

http: restore header folding behavior

Folded header lines will now get passed through like before. The headers
API is adapted and will provide the content unfolded.

Added test 1274 and extended test 1940 to verify.

Reported-by: Petr Pisar
Fixes #8844
Closes #8899

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configure: add --enable-headers-api to enable the headers API

Defaults to disabled while labeled EXPERIMENTAL.

Make all the headers API tests require 'headers-api' to run.

header api: add curl_easy_header and curl_easy_nextheader

Add test 1940 to 1946 to verify.

Closes #8593