Non-alphanumeric character problem in cOS Core HTTPPoster

Last modified on 13 Feb, 2023. Revision 9
This short article will describe how to solve problems when using the HTTPPoster with non-alphanumeric characters in the specified URL.
Up to date for
cOS Core 14.00.06
Supported since
cOS Core 9.x
Status OK


We have a firewall using nearly identical lines in HTTPPoster, where only the username and password is different. One of them refuses to login. The only difference is that the one that does not work has non-alphanumeric characters like ‘$’ in the password or username.


Encode such non-alphanumeric characters using URL encoding. This is done by replacing the character with a “%” symbol followed by its two-digit hexadecimal representation.

Example of some characters that need to be URL encoded

Character What to write 
Space %20 
" (quote) %22 
# (pound/hash) %23 
$ (dollar) %24 
% (percent) %25 
& (ampersand) %26 
+ (plus) %2B 
: (colon) %3A 
@ ("at") %40

Syntax example

Username alice, password very@secret%pw at host would become

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