Squid is a caching and forwarding HTTP web proxy. It has a wide variety of uses, including speeding up a web server by caching repeated requests, caching World Wide Web (WWW), Domain Name System (DNS), and other network lookups for a group of people sharing network resources, and aiding security by filtering traffic. Although used for mainly HTTP and File Transfer Protocol (FTP), Squid includes limited support for several other protocols including Internet Gopher, Secure Sockets Layer (SSL),[7] Transport Layer Security (TLS), and Hypertext Transfer Protocol Secure (HTTPS). Squid does not support the SOCKS protocol, unlike Privoxy, with which Squid can be used in order to provide SOCKS support.

Squid was originally designed to run as a daemon on Unix-like systems. A Windows port was maintained up to version 2.7. New versions available on Windows use the Cygwin environment.[8] [9] Squid is free software released under the GNU General Public License.

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Squid was originally developed as the Harvest object cache,[7] part of the Harvest project at the University of Colorado Boulder.[10][11] Further work on the program was completed at the University of California, San Diego and funded via two grants from the National Science Foundation.[12] 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.[13][14] Squid version 1.0.0 was released in July 1996.[13] SquidNT, a port of the Squid proxy server was merged into the main Squid project in September 2006.[15]

After 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. This is often useful for Internet service providers to increase speed to their customers, and LANs that share an Internet connection. 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.

A client program (e.g. 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. The latter is typically a corporate set-up (all clients are on the same LAN) and often introduces the privacy concerns mentioned above.

Squid has some features that can help anonymize connections, such as disabling or changing specific header fields in a client's HTTP requests. Whether these are set, and what they are set to do, is up to the person who controls the computer running Squid. People requesting pages through a network which transparently uses Squid may not know whether this information is being logged.[17] Within UK organisations at least, users should be informed if computers or internet connections are being monitored.[18]

As an example, if slow.example.com is a "real" web server, and www.example.com is the Squid cache server that "accelerates" it, the first time any page is requested from www.example.com, the cache server would get the actual page from slow.example.com, but later requests would get the stored copy directly from the accelerator (for a configurable period, after which the stored copy would be discarded). The 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. 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. 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.

It is possible for one Squid server to serve simultaneously as a normal and a reverse proxy. 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. 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.

For example, a feature of the HTTP protocol is to limit a request to the range of data in the resource being referenced. 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.

Partial 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.

Squid can relay partial requests to the origin web server. In order for a partial request to be satisfied at a fast speed from cache, Squid requires a full copy of the same object to already exist in its storage.

If a proxy video user is watching a video stream and browses to a different page before the video completely downloads, Squid cannot keep the partial download for reuse and simply discards the data. Special configuration is required to force such downloads to continue and be cached.[19]

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator. It runs on most available operating systems, including Windows and is licensed under the GNU GPL.

Squid is used by hundreds of Internet Providers world-wide to provide their users with the best possible web access. Squid optimises the data flow between client and server to improve performance and caches frequently-used content to save bandwidth. Squid can also route content requests to servers in a wide variety of ways to build cache server hierarchies which optimise network throughput.

Thousands of web-sites around the Internet use Squid to drastically increase their content delivery. Squid can reduce your server load and improve delivery speeds to clients. Squid can also be used to deliver content from around the world - copying only the content being used, rather than inefficiently copying everything. Finally, Squid's advanced content routing configuration allows you to build content clusters to route and load balance requests via a variety of web servers.

[The Squid systems] are currently running at a hit-rate of approximately 75%, effectively quadrupling the capacity of the Apache servers behind them. This is particularly noticeable when a large surge of traffic arrives directed to a particular page via a web link from another site, as the caching efficiency for that page will be nearly 100%. - Wikimedia Deployment Information.

As for ArcGIS Desktop (ArcMap) it does work with Authenticated Forward Proxies at version 10.3 which was recently released. If the client uses an Authenticated Forward Proxy when ArcMap 10.3 is opened it will display prompt asking for credentials. Once the credentials are entered ArcMap will be able to connect to ArcGIS Online through the Authenticated Forward Proxy.

Have taken up with esri support. esri appear to have been able to reproduce the problem with a default install of SQUID proxy server. They have suggested some changes, which we are currently in discussion with our ICT department to trial. Will keep you posted.

I have a similar issue, although my configuration is slightly different: ArcGIS PRO 1.2 + Portal for ArcGIS 10.3.1 (more than a year after some versions have rolled out!), but also using a SQUID Proxy in a "Named users" licensing configuration. I have checked BUG-000083997 status, which is "Not in Current Product Plan".

I'm already working with ESRI Support staff, but no success yet, so here I am, sharing my prayers to the community... Has anyone out there found a valid configuration for SQUID Proxy and/or ArcGIS PRO?

Anyhow, it seems strange to me... if an "Authenticated Forward Proxy" is not supported it should be pretty clear on the documentation, and if it is a bug (as it seems to be, since it is documented as one) it should be addressed and included in a Product Plan, shouldn't it?

long time ago while using ubuntu 10.04 i have install squid server and webmin and never check it. i know that webmin wont work for long time with ubuntu higher level so that why im back using 10.04 at that time. then i try to install ubuntu 12.04 by taking risk its ok without webmin as far squid still work .. i dont check it after install the 1st beta version of 12.04 and now .. i just wondering why it takes so long time to opening some games on fb or loading cnn news page then i try to check and restart also try to install it but i can't get the access to squid.

Proxy servers are a type of server application that functions as a gateway between an end user and an internet resource. Through a proxy server, an end user is able to control and monitor their web traffic for a wide variety of purposes, including privacy, security, and caching. For example, you can use a proxy server to make web requests from a different IP address than your own. You can also use a proxy server to research how the web is served differently from one jurisdiction to the next, or avoid some methods of surveillance or web traffic throttling. 152ee80cbc

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