![]() #Squidman mac updatePartial downloads are also extensively used by Microsoft Windows Update so that extremely large update packages can download in the background and pause halfway through the download, if the user turns off their computer or disconnects from the Internet. This feature is used extensively by video streaming websites such as YouTube, so that if a user clicks to the middle of the video progress bar, the server can begin to send data from the middle of the file, rather than sending the entire file from the beginning and the user waiting for the preceding data to finish loading. The same Squid server could act as a classical web cache, caching HTTP requests from clients within the business (i.e., employees accessing the internet from their workstations), so accelerating web access and reducing bandwidth demands.įor example, a feature of the HTTP protocol is to limit a request to the range of data in the resource being referenced. For example, a business might host its own website on a web server, with a Squid server acting as a reverse proxy between clients (customers accessing the website from outside the business) and the web server. It is possible for a single Squid server to serve both as a normal and a reverse proxy simultaneously. 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. ![]()
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