mmustafasenoglu opened a new pull request, #13314:
URL: https://github.com/apache/trafficserver/pull/13314
## Summary
Remove the exception that allowed '@' character in header names.
## Changes
- Removed the special case that allowed '@' in header names
- Updated the comment to reference RFC 9110 Section 5.1
## Why
RFC 9110 Section 5.1 states that header field names must consist only of
tchar characters:
```
tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*"
/ "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
/ DIGIT / ALPHA
```
'@' is not in this list, so header names containing '@' should be rejected
with a 400 response.
The previous fix for INKqa09141 incorrectly allowed '@' in header names.
Fixes #12082
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