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 HTTPD ACCELERATOR SERVICE 
In this acceleration mode, if the Web Server runs on     the same server where Squid is installed, you must set its daemon to run on     port 81. With the Apache web server, you can do it by assigning the line     Port 80 to Port 81 in its httpd.conf file. If the Web Server runs on other     servers in your network like we do, you can keep the same port number (80)     for Apache, since Squid will bind on a different IP number where port (80)     is not already in use. 
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