A way to adapt the reporting on the source server is to use the X-Forwarded-For HTTP header reported by the reverse proxy, to get the real client's IP address. This does, however, mean that the source server cannot accurately report on its traffic numbers without additional configuration, as all requests would seem to have come from the reverse proxy. The end result, without any action by the clients, is less traffic to the source server, meaning less CPU and memory usage, and less need for bandwidth. In this mode, the cache serves an unlimited number of clients for a limited number of-or just one-web servers.Īs an example, if is a "real" web server, and is the Squid cache server that "accelerates" it, the first time any page is requested from the cache server would get the actual page from, but later requests would get the stored copy directly from the accelerator (for a configurable period, after which the stored copy would be discarded). Another setup is " reverse proxy" or "webserver acceleration" (using http_port 80 accel vhost). The above setup-caching the contents of an unlimited number of webservers for a limited number of clients-is the classical one. Within UK organisations at least, users should be informed if computers or internet connections are being monitored. People requesting pages through a network which transparently uses Squid may not know whether this information is being logged. Whether these are set, and what they are set to do, is up to the person who controls the computer running Squid. Squid has some features that can help anonymize connections, such as disabling or changing specific header fields in a client's HTTP requests. The latter is typically a corporate set-up (all clients are on the same LAN) and often introduces the privacy concerns mentioned above. browser) either has to specify explicitly the proxy server it wants to use (typical for ISP customers), or it could be using a proxy without any extra configuration: "transparent caching", in which case all outgoing HTTP requests are intercepted by Squid and all responses are cached. Because the caching servers are controlled by the web service operator, caching proxies do not anonymize the user and should not be confused with anonymizing proxies.Ī client program (e.g. This is often useful for Internet service providers to increase speed to their customers, and LANs that share an Internet connection. Squid is now developed almost exclusively through volunteer efforts.Īfter a Squid proxy server is installed, web browsers can be configured to use it as a proxy HTTP server, allowing Squid to retain copies of the documents returned, which, on repeated requests for the same documents, can reduce access time as well as bandwidth consumption. SquidNT, a port of the Squid proxy server was merged into the main Squid project in September 2006. Squid version 1.0.0 was released in July 1996. Duane Wessels forked the "last pre-commercial version of Harvest" and renamed it to Squid to avoid confusion with the commercial fork called Cached 2.0, which became NetCache. Further work on the program was completed at the University of California, San Diego and funded via two grants from the National Science Foundation. Squid was originally developed as the Harvest object cache, part of the Harvest project at the University of Colorado Boulder. Squid is free software released under the GNU General Public License. ![]() ![]() New versions available on Windows use the Cygwin environment. A Windows port was maintained up to version 2.7. Squid was originally designed to run as a daemon on Unix-like systems. Squid does not support the SOCKS protocol, unlike Privoxy, with which Squid can be used in order to provide SOCKS support. Although primarily used for HTTP and FTP, Squid includes limited support for several other protocols including Internet Gopher, SSL, TLS and HTTPS. It has a wide variety of uses, including speeding up a web server by caching repeated requests, caching web, DNS and other computer network lookups for a group of people sharing network resources, and aiding security by filtering traffic. Squid is a caching and forwarding HTTP web proxy.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |