This is the port, or ports, Squid uses to listen for HTTP requests from cache clients. If your system has more than one network interface, you can use the optional hostname prefix to make Squid bind the socket to a specific IP address. The hostname must correspond to one of your interface addresses. I recommend using an IP address here, instead of a hostname, to avoid DNS lookup delays at startup.
If you run Squid as a surrogate (accelerator), you probably want to accept HTTP connections on port 80. Binding to privileged ports requires root permissions.
http_port [hostname:]port [[hostname:]port] ...
http_port 8080 http_port 3128 3129 3130 3131 http_port 192.168.1.1:3128
https_port, icp_port, htcp_port, snmp_port, httpd_accel_port, http_access