To formalize they are now XML-compliant (with some asterisks.)
Also to help syntax highlighters work on them to make their content more
readable.
Also:
- Delete empty comment decorations.
- GHA/checksrc: simplify XML check.
- runtests: fail to load test data with XML prolog missing.
Follow-up to bfe6eb1c06#19927
Follow-up to 87ba80a6dfCloses#19946
Use the %VERSION instead. The user-agent stripping was introduced at the
time before we had %VERSION (introduced in e6b21d4). The tests would
then remove the user-agent header to make them possible to be compared
in a version independent way.
Fixes#19355
Reported-by: Stefan Eissing
Closes#19356
When multiple headers share the same name, AWS SigV4 expects them to be
merged into a single header line, with values comma-delimited in the
order they appeared.
Add libtest 1978 to verify.
Closes#16743
