• 10Oct

    Web proxy servers

    Web proxies forward HTTP requests. Some web proxies allow the HTTP CONNECT to set up forwarding of arbitrary data through the connection; normally this is only allowed to port 443 to allow forwarding of HTTPS traffic.

    Examples of web proxy servers include Apache (with mod_proxy or Traffic Server), HAProxy, IIS configured as proxy (e.g., with Application Request Routing), Nginx, Privoxy, Squid, Varnish (reverse proxy only), WinGate, Ziproxy, Tinyproxy, RabbIT4 and Polipo.
    SOCKS proxy

    SOCKS also forwards arbitrary data after a connection phase, and is similar to HTTP CONNECT in web proxies.
    Transparent proxy

    Also known as an intercepting proxy, inline proxy, or forced proxy, a transparent proxy intercepts normal communication at the network layer without requiring any special client configuration. Clients need not be aware of the existence of the proxy. A transparent proxy is normally located between the client and the Internet, with the proxy performing some of the functions of a gateway or router.[11]

    RFC 2616 (Hypertext Transfer Protocol—HTTP/1.1) offers standard definitions:

    “A ‘transparent proxy’ is a proxy that does not modify the request or response beyond what is required for proxy authentication and identification”.
    “A ‘non-transparent proxy’ is a proxy that modifies the request or response in order to provide some added service to the user agent, such as group annotation services, media type transformation, protocol reduction, or anonymity filtering”.

    TCP Intercept is a traffic filtering security feature that protects TCP servers from TCP SYN flood attacks, which are a type of denial-of-service attack. TCP Intercept is available for IP traffic only.

    In 2009 a security flaw in the way that transparent proxies operate was published by Robert Auger,[12] and the Computer Emergency Response Team issued an advisory listing dozens of affected transparent and intercepting proxy servers.

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