Forum Discussion
smalex
Altostratus
AltostratusASM 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 c...
samstep
Cirrocumulus
Cirrocumulus"!" 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
