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A check that NGINX accepts malformed HTTP/2 or HTTP/3 requests should be specific to such malformed requests, not hidden in general tests for HTTP/2 and HTTP/3 headers.
Do not use a regular expression that matches CR.
Lots of code used a bare LF in the HTTP protocol, but that is wrong: RFC9112 is very clear that CRLF is the HTTP line terminator. Most of the changes are just replacing \n with \r\n or adding missing \r in heredocs, but it is also necessary to update byte counts to include the extra bytes.
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Proposed changes
Only send well-formed messages to NGINX, unless a test is about non-conforming messages being rejected.
Checklist
Before creating a PR, run through this checklist and mark each as complete:
README.mdand/orCHANGELOG.md).