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An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided. 497 HTTP Request Sent to HTTPS Port. An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. 499 Client Closed Request.
v. t. e. HTTP header fields are a list of strings sent and received by both the client program and server on every HTTP request and response. These headers are usually invisible to the end-user and are only processed or logged by the server and client applications. They define how information sent/received through the connection are encoded (as ...
HTTP/3. HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web, complementing the widely-deployed HTTP/1.1 and HTTP/2. Unlike previous versions which relied on the well-established TCP (published in 1974), [ 2 ] HTTP/3 uses QUIC, a multiplexed transport protocol built on UDP. [ 3 ]
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A proxy auto-config ( PAC) file defines how web browsers and other user agents can automatically choose the appropriate proxy server (access method) for fetching a given URL . A PAC file contains a JavaScript function FindProxyForURL(url, host). This function returns a string with one or more access method specifications.
A forward cache is a cache outside the web server's network, e.g. in the client's web browser, in an ISP, or within a corporate network. A network-aware forward cache only caches heavily accessed items. A proxy server sitting between the client and web server can evaluate HTTP headers and choose whether to store web content.
v. t. e. The X-Forwarded-For ( XFF) HTTP header field is a common method for identifying the originating IP address of a client connecting to a web server through an HTTP proxy or load balancer . The X-Forwarded-For HTTP request header was introduced by the Squid caching proxy server's developers. [citation needed] X-Forwarded-For is also an ...
Many websites have customized their 404 pages with creative designs, messages, or features to entertain or assist their visitors. For example, Google's 404 page features a broken robot and a link to its homepage, [4] while GitHub's 404 page shows a random image of a parallax star field and a link to its status page. [5]