Rest API fails to post attachment, if the name contains square braces (or other special characters).

• Example filename 

https://****api/v1/CreatAttachment?table_name=sn_customerservice_case&table_sys_id=xxxxxxxx&file_name=yyyyy[zzzzz].png

• if the filename contains "[" and "]" , then API fails to post the attachments, but if the name of the filename is simple then it works perfectly fine.
• Error Messages :

trax BR inc2.2: Error executing REST request: Invalid uri

and

Invalid query

• The square brackets ( [zzzzz] ) are not escaped and so the filename is not correct.

• Solutions are to either escape the square brackets or use URL encoding 

e.g.

Changed 

file_name=yyyyy[zzzzz].png'

to

file_name=yyyyy%5Bzzzzz%5D.png'