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ASM illegal meta character '!'

We are implementing ASM here at the site. We had enabled traffic learning and have got 5000+ suggestions. Majority of those suggestions comes under 'Illegal meta character in URL'. And the illegal character being referred to is the exclamation mark '!'.

I understand that I can include that as accepted character, but would like to know why F5 considers '!' as illegal when the RFC declares it to be legal character.

Please share your views

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USER ACCEPTED ANSWER & F5 ACCEPTED ANSWER

"!" is a dangerous character because in UNIX-based system it can indicate that a text file may become executable (google for "shebang" and "hashbang" if you would like to learn more).

However "!" is also used by some modern frameworks like Angular so I assume that is why you got very high number of learning suggestions to allow it in URLs

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Comment made 1 week ago by smalex 72

thank you so much Samstep

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