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I have a quick question. Why exclamation mark doesn't work in UTM parameters.

I will give you an example - this url which is generated by external tool doesn't work and redirect to home page:

https://www.example_site.com/xx/xx/xxx?utm_source=facebook&utm_medium=cpc&utm_term=XX&utm_campaign=Test_Test_Test&utm_id=xx1!12345678

But when i manually delete ! mark from utm_id (last part) it starts working:

https://www.example_site.com/xx/xx/xxx?utm_source=facebook&utm_medium=cpc&utm_term=XX&utm_campaign=Test_Test_Test&utm_id=xx112345678

utm_id is generated automatically so I cannot change it other way then manually all the time.

How could I solve this problem and why this is happening?

Michal
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  • Why do you expect it to work? Any exclamation points in URLs should probably be percent-encoded, like `%21`. – tripleee Aug 06 '21 at 07:29
  • Actually - "%" mark behave in the same way as "!". I check another characters and so far "#" and "?" marks are working as I expect. – Michal Aug 06 '21 at 07:56

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