[squid-users] Can I safely increase MAX_URL to 12KByte?

[Amos Jeffries]

On 12/01/2026 20:23, Dieter Bloms wrote:
> Hello,
> 
> there is a web application, which uses URLs longer than 8 KByte.
> Now I would like to set MAX_URL to 12 KByte in src/defines.h, but I'am not
> sure what negative effects this might have.
> 
> Does anybody know if I can safely increase this value to 12 KByte?
> 

Maybe. You can try, but no promises on good behaviour.
(This is the same deal as HTTP protocol itself - agents are required to 
support 8KB URLs, "MAY" support more)

FWIW, there are still legacy c-string buffers which are limited to 8KB 
(not using "MAX_URL" constant to stretch) in HTTP Authentication (Basic 
with LDAP, Digest, Kerberos), HTCP, ICP, and pinger which may need to 
have URIs inside them. Those components are more likely to have issues 
than others.


HTH
Amos