Reading Time: 6 minutesA Squid Proxy Server is a feature rich web server application that provides both reverse proxy services and caching options for websites. This provides a noticeable speedup of sites and allows for reduced load times when being utilized.Squids reverse proxy is a service that sits between the Internet and the webserver (usually within a private network) that redirects inbound client requests to a server where data is stored for easier retrieval. If the caching server (proxy) does not have the cached data, it then forwards the request on to the webserver where the data is actually stored. This type of caching allows for the collection of data and reproducing the original data values stored in a different location to provide for easier access.A reverse proxy typically provides an additional layer of control to smooth the flow of inbound network traffic between your clients and the webserver.Squid can be used as a caching service to SSL requests as well as DNS lookups. It can also provide a wide variety of support to multiple other types of caching protocols, such as, as well as. Squid is an excellent choice for many types of setups as it provides very granular controls by offering numerous system tools, as well as a monitoring framework using to provide a solid base for your caching needs.When selecting a computer system for use as a dedicated Squid caching proxy server, many users ensure it is configured with a large amount of physical memory (RAM) as Squid maintains an in-memory cache for increased performance.
Installing SquidLet’s start by ensuring our server is up to date:root@test # apt-get updateGet:1 xenial-security InRelease 109 kBHit:2 xenial InReleaseHit:3 xenial InReleaseGet:4 xenial-updates InRelease 109 kBGet:5 xenial-backports InRelease 107 kBFetched 325 kB in 0s (567 kB/s)Reading package lists. DoneNext, at the terminal prompt, enter the following command to install the Squid server:root@test # apt install squidReading package lists. DoneBuilding dependency treeReading state information.
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The Squid proxy server is one of the most famous proxy servers in the world. This software is a ‘must have’ in every network administrator’s tool bag. Squid is being used for web content caching, web access control, as a reverse proxy – anywhere the goal is productivity and easy control. Proxy A sends and ICP query to Proxy B about an object, Proxy B replies with an ICPHIT. Proxy A forwards the HTTP request to Proxy B, but does not pass on the authentication details, therefore the HTTP GET from Proxy A fails. Only ONE proxy cache in a chain is allowed to 'use' the Proxy-Authentication request header.
Multiple settings mention httpaccess. We want to modify the last entry.1164 # Deny requests to certain unsafe ports1165 httpaccess deny!Safeports.1167 # Deny CONNECT to other than secure SSL ports1168 httpaccess deny CONNECT!SSLports.1170 # Only allow cachemgr access from localhost1171 httpaccess allow localhost manager1172 httpaccess deny manager.1186 #httpaccess allow localnet1187 httpaccess allow localhost.1189 # And finally deny all other access to this proxy1190 httpaccess deny all# change to “allow all”.