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Re: No forward-proxy ports error in 3.3
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On 25/04/2012 1:48 a.m., Ahmed Talha Khan wrote:
Hey Amos,, Can you explain a little how this forward-proxy will be used by squid? So i might be able to make a plausible cause for my setup not working.
Sure. 1) When producing an error page there are CSS embeded images(s),2) When generating FTP directory listing there are icons for each file on the list, 3) When generating FTP directory listing there are icons for each file on the list, 4) The cachemgr.cgi API can be accessed via HTTP or HTTPS protocol through thsis port. 5) URLs inside any HTML manager reports may use this port to target particular worker for servicing a request.
The visible_hostname and forward-proxy port are used to generate the URLs in these responses.
For example: http_port 192.168.0.1:3128 visible_hostname f.example.com generates: http://f.example.com:3128/squid-internal-icons/text.png http://f.example.com:3128/squid-internal-mgr/ http://f.example.com:3128/squid-internal-mgr/menuIt is important that the proxy be directly addressible for these types of things . There are many proxies operating on the Internet, and while the icons request may be serviced by any of them the mgr interface you definitely do not want to proxy-A to respond or perform management requests intended fro proxy-B.
5) to exchange traffic between proxy peers a forward-proxy port is required by cache_peer as the http-port option. This gets used for all traffic fetched through that peer, including cache digests, netdb exchanges and background live/dead monitoring probes.
There are likely some other things I've forgotten, but those are the main ones.
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