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The server is a transforming proxy (e.g. a Web accelerator) that received a 200 OK from its origin, but is returning a modified version of the origin's response.: §15.3.4 : §7.7 204 No Content The server successfully processed the request, and is not returning any content. 205 Reset Content
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 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.
HTTP message. The request/response message consists of the following: Request line, such as GET /logo.gif HTTP/1.1 or Status line, such as HTTP/1.1 200 OK, Headers. An empty line. Optional HTTP message body data. The request/status line and headers must all end with <CR><LF> (that is, a carriage return followed by a line feed ).
In 1992, Tim Berners-Lee, the inventor of the Web, and his team at CERN, the European Organization for Nuclear Research, created the first web server software, called CERN httpd. This software used a simple file system to store and retrieve web pages, and it assigned a three-digit number to each type of request and response.
HTTP persistent connection, also called HTTP keep-alive, or HTTP connection reuse, is the idea of using a single TCP connection to send and receive multiple HTTP requests /responses, as opposed to opening a new connection for every single request/response pair. The newer HTTP/2 protocol uses the same idea and takes it further to allow multiple ...
HTTP response splitting. HTTP parameter pollution. HTTP compression is a capability that can be built into web servers to improve transfer speed and bandwidth utilization.  HTTP data is compressed before it is sent from the server: compliant browsers will announce what methods are supported to the server before downloading the correct format ...
A possible interaction between a web browser and a web server holding a web page in which the server sends a cookie to the browser and the browser sends it back when requesting another page. Cookies are arbitrary pieces of data, usually chosen and first sent by the web server, and stored on the client computer by the web browser.