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Kamesh SinghKamesh Singh 

Custom Close Case Button Issue After Winter'21 Release

Hi All.

I have a Custom Close Case Button in my customer community and below is the code.

This code was working till last week before Winter'21 release but after that its failing and below errors we are getting.

This is the url its redirecting to:


Error on Page.
You have sent us an Illegal URL or an improperly formatted request.

Can anyone please help on this?
VinayVinay (Salesforce Developers) 
Hi Kamesh,

This might happen if we are passing any special characters or % in the URL attributes.

Check below reference link for above error.