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The first question to ask is whether it's a web proxy or an HTTP proxy. Does it look like a web server? Keywords to look for in search results are PHP-proxy, CGI-proxy, Glype, and NPH, as well as domain names. Do the rDNS and WHOIS suggest it's a dedicated server or hosting range? Open the IP address in your browser.
The server then proceeds to make the connection on behalf of the client. Once the connection has been established by the server, the proxy server continues to proxy the TCP stream to and from the client. Only the initial connection request is HTTP - after that, the server simply proxies the established TCP connection.
A Gemini browser, for example, may be the client and an application running on a computer hosting a Gemini site may be the server. The client sends a Gemini request message to the server, and the server sends back a response message. Gemini uses a separate connection to the same server for every resource request. [6]
Some anonymizing proxy servers may forward data packets with header lines such as HTTP_VIA, HTTP_X_FORWARDED_FOR, or HTTP_FORWARDED, which may reveal the IP address of the client. Other anonymizing proxy servers, known as elite or high-anonymity proxies, make it appear that the proxy server is the client.
Free and open-source software portal; Pages in category "Free proxy servers" ... Caddy (web server) E. EAccelerator; M. MMCache; N. Nginx; O.
A de facto standard for identifying the originating protocol of an HTTP request, since a reverse proxy (or a load balancer) may communicate with a web server using HTTP even if the request to the reverse proxy is HTTPS. An alternative form of the header (X-ProxyUser-Ip) is used by Google clients talking to Google servers.
Free proxy servers (15 P) F. Forward proxy (4 P) R. Reverse proxy (18 P) Pages in category "Proxy servers" ... Web Proxy Auto-Discovery Protocol; WinGate; X.
HTTP functions as a request–response protocol in the client–server model. A web browser, for example, may be the client whereas a process, named web server, running on a computer hosting one or more websites may be the server. The client submits an HTTP request message to the server.