I'm using squid2.5STABLE4. And I'm using upper proxy server than squid server. browser → squid → upper proxy → Web server When I fail to access, I get error messages in browser. In error message URL is described like below. NONE://10.72.43.56:8181http://nonexist-domain.com/ 10.72.43.56 is IP address of upper proxy server. 8181 is port number of upper proxy server. "http://nonexist-domain.com/" is URL I requested. I don't want to represent the part of "NONE://10.72.43.56:8181". I want to represent only "http://nonexist-domain.com/". Can I customize the representation of URL like above.