The existing code tried but did not properly reject alternative services
using negative or too large port numbers.
With this fix, the logic now also flushes the old entries immediately
before adding a new one, making a following header with an illegal entry
not flush the already stored entry.
Report from the ongoing source code audit by Trail of Bits.
Adjusted test 356 to verify.
Closes#9607
missing CRs and modified %hostip
lib556/test556: use a real HTTP version to make test reuse more convenient
make sure the weekday in Date headers matches the date
test61: replace stray "^M" (5e 4d) at the end of a cookie with a '^M' (0d)
Gets the test working with external proxies like Privoxy again.
Closes#6463
Allow pretty much anything to be part of the ALPN identifier. In
particular minus, which is used for "h3-20" (in-progress HTTP/3
versions) etc.
Updated test 356.
Closes#4182
