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Super Moderator
How a Proxy Server works
Summary
This article attempts to describe how your web browser fetches pages from the World Wide Web for a variety of methods, including transparent and non-transparent web cahces.
More Information
Without any proxy
- Your PC does a dns lookup of the required domain using its own (locally) defined dns servers.
- It sends the http request on tcp port 80 to the destination server?s IP address.
- This request is routed over the network direct to the specified server IP.
- The requested page is then returned, by the server, direct to the client.
Using a manually defined proxy
- Your PC does a dns lookup of the proxy servers IP using its own (locally) defined dns servers.
- It sends the http request on tcp port 8080 to the proxy servers IP address.
- This request is routed over the network direct to the specified proxy server IP.
- The proxy server checks if it has a valid copy of the requested page in its cache (using the domain name, not IP address).
- If the proxy has the page it returns it directly back to the client ? job done.
- If the proxy does not have the page it does a dns lookup of the requested domain using it?s own defined dns servers.
- The proxy sends the http request on tcp port 80 to the destination servers IP address.
- This request is routed over the network direct to the destination servers IP.
- The requested page is then returned, by the destination server, directly back to the proxy server.
- The requested page is then returned, by the proxy server, direct to the client.
Transparent Proxy (if you have no manually defined proxy, but NTL?s proxies are active)
- Your PC does a dns lookup of the destination servers IP using its own (locally) defined dns servers.
- It sends the http request on tcp port 80 to the destination servers IP address.
- This request is intercepted by NTL?s routers and re-directed to one of a group of transparent proxy [cache] servers ? the decision on which proxy server gets used is based on the requested domains IP address.
- The chosen proxy server checks if it has a valid copy of the requested page in its cache (using the domain name, not IP address).
- If the proxy has the page it returns it directly back to the client, Job done.
- If the proxy does not have the page it does a dns lookup of the requested domain using it?s own defined dns servers.
- The proxy sends the http request on tcp port 80 to the destination servers IP address.
- This request is routed over the network direct to the destination servers IP.
- The requested page is then returned, by the destination server, directly back to the proxy server.
- The requested page is then returned, by the proxy server, direct to the client.
This article was originally written by Paul M on the CF forum.
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Re: How a Proxy Server works
Who is Zippy 4
lol
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Re: How a Proxy Server works
Zippy 3's brother.
Administrator
![](image.php?s=04d190acb4adad9e23b8bc2584ab3e36&u=8&type=sigpic&dateline=1509894523)
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Member
Re: How a Proxy Server works
younger or older?? is the 4 his age or order of birth
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Pass me the Banhammer
Re: How a Proxy Server works
![Quote](images/misc/quote_icon.png)
Originally Posted by
Jules
Who is Zippy 4
![Confused](https://www.cableforum.info/board/images/smilies/confused.png)
lol
A relative of Bungle ?
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Junior Member
Re: How a Proxy Server works
![Quote](images/misc/quote_icon.png)
Originally Posted by
Rob
Should be a good mod then haha bungle things hahaha
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Junior Member
Re: How a Proxy Server works
Someone mentioned my name?
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Member
Re: How a Proxy Server works
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Senior Member
Re: How a Proxy Server works
![Quote](images/misc/quote_icon.png)
Originally Posted by
David F
Yes Matt lol lol
Nice bit of investigation
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Pass me the Banhammer
Re: How a Proxy Server works
There were a few big clues in the mods area
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Junior Member
Re: How a Proxy Server works
I think someone Bungled his identity
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