Archive for the ‘web proxy’ Category

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Friday, November 7th, 2008

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Use a proxy server and setup proxy in your browser?

Saturday, July 5th, 2008

 the use of proxy servers without the express permission from the owner of the proxy server may be illegal in some states and/or countries. Use at your own risk. Use your favorite search engine and search for ‘proxy server list’. You’ll find many sites with lists of proxy servers, their IP address, the port they listen on, and usually what country they are in. Write down a few of them.

You may see references to four different types of proxy servers:

  • Transparent Proxy - This type of proxy server identifies itself as a proxy server and also makes the original IP address available through the http headers. These are generally used for their ability to cache websites and do not effectively provide any anonymity to those who use them. However, the use of a transparent proxy will get you around simple IP bans. They are transparent in the terms that your IP address is exposed, not transparent in the terms that you do not know that you are using it (your system is not specifically configured to use it.)
  • Anonymous Proxy - This type of proxy server indentifies itself as a proxy server, but does not make the original IP address available. This type of proxy server is detectable, but provides reasonable anonymity for most users.
  • Distorting Proxy - This type of proxy server identifies itself as a proxy server, but make an incorrect original IP address available through the http headers.
  • High Anonymity Proxy - This type of proxy server does not identify itself as a proxy server and does not make available the original IP address.

Instructions to config with Internet Explorer 6.0

  1. On the Tools menu in Internet Explorer, click Internet Options, click the Connections tab, and then click LAN Settings.
  2. Under Proxy server, click to select the Use a proxy server for your LAN check box.
  3. In the Address box, type the IP address of the proxy server.
  4. In the Port box, type the port number that is used by the proxy server for client connections (by default, 8080).
  5. You can click to select the Bypass proxy server for local addresses check box if you do not want the proxy server computer to be used when you connect to a computer on the local network (this may speed up performance).
  6. Click OK to close the LAN Settings dialog box.
  7. Click OK again to close the Internet Options dialog box.

Instructions to config with Internet Explorer 5

  1. Click Start, point to Settings, click Control Panel, and then double-click Internet.
  2. Click the Connections tab, click LAN Settings, and then click to select the Use Proxy Server check box.
  3. In the Address box, type the appropriate proxy server information, and use the following format: http://<address>
  4. Click Advanced, and then type the appropriate proxy settings in the Servers area. Use the following syntax for the proxy settings: http://<address>:<port> where <address> is the Web address of the proxy server, and <port> is the port number that is assigned to the proxy server. For example, if the proxy server’s address is “proxy.example.microsoft.com” and the port number is 80, the setting in the Proxy Server box should appear like this: http://proxy.example.microsoft.com:80 Important: If you use a backslash (\) instead of a slash (/) in the proxy server’s address, the settings disappear from the Proxy Server box and Internet Explorer does not find the proxy server.

    If you are using the Internet Protocol (IP) address of your proxy server, make sure not to type leading zeros. For example, use 10.25.0.1 instead of 010.025.000.001.

set up proxy with  FireFox

  1. Select the Tools Menu
  2. Select Options
  3. Select Connection Settings
  4. Select Manual Proxy Configuration
  5. Check Use the same proxy for all protocols
  6. Enter the IP address for the HTTP proxy server
  7. Enter the port of the HTTP proxy server
  8. Click Okay

HTTP Proxy Cache

Saturday, July 5th, 2008

What is HTTP Proxy Cache?
There are three reasons for using a HTTP proxy server:

  1. Because you are behind a firewall (for security) and you have to.
  2. Because using a cache speeds up Web browsing significantly, for you and everyone else.
  3. Because you don’t have enough ‘real’ IP addresses for your machines.

If you are behind a firewall you are probably using one already. If not, you might consider installing one.

Configuring a browser for HTTP proxy

Some browsers may accept only one value, for instance (on Unix) by using setenv http_proxy http://somewhere.org:80/. Certain domains may be excluded, typically ones own domain, by using setenv no_proxy some.org,some.other.org. Other browsers, such as Netscape, have a more sophisticated scheme for supporting multiple proxies. Netscape has a scheme for automated proxy handling using Javascript. Mosaic-2.7 also allows a list of proxies.

Bypassing cache in Proxy

If an http request has the Pragma: no-cache header set, then the cache is directed to get a new copy. It may, however, save the new copy itself. Using Reload on Netscape, Mosaic and Lynx (possibly all browsers) sends a request with this header.

Cacheable and uncacheable documents and Proxy

Regular HTML files are usually cacheable. Cacheing agents may require a valid Last-Modified header , and may not cache objects greater than a certain size or subject to other restrictions. HTML documents generated by CGI scripts can be made cacheable or not by generating an Expires header, though some agents may not cache URLs with “cgi-bin” or a query string. Documents requiring authorisation should not normally be cached. Netscape has an option to cache documents obtained from an SSL (Secure) server locally. If you turn this on, someone who gains access to your computer (perhaps by stealing it) can read all your recent secure transactions. Note that different cache servers may interpret the http specification in slightly different ways, so that a document cached by one may not be cached by another.