tree 0ac1ad8b62e6b90efaee7a69e8be4880b49fdda1
parent 83bd4c083927c52a418ef4694780e36176779432
author QUICHE team <quiche-dev@google.com> 1761867798 -0700
committer Copybara-Service <copybara-worker@google.com> 1761867862 -0700

Add helper methods to check a string's RFC 9110, 5.6.2 compliance

https://datatracker.ietf.org/doc/html/rfc9110#section-5.6.2 shows the grammar for a `token` and gives an _inclusive_ listing of characters. Balsa does not currently have a helper which exactly matches this listing of characters. The closest thing we have is the _exclusive_ list `kInvalidHeaderKeyCharList` which _almost_ matches this inclusive list with the exception of `:` for the set of US-ASCII characters. We add the helper here for use by future changes.

Protected by adding helper method for future CL.

PiperOrigin-RevId: 826236709