email clients, standalone download managers like youtube-dl, and other command-line utilities like cURL. The user agent is the client in a client–server...

Development of HTTP was initiated by Tim Berners-Lee at CERN in 1989 and summarized in a simple document describing the behavior of a client and a server...

Hypertext Transfer Protocol (HTTP) response status codes are issued by a server in response to a client's request made to the server. It includes codes...

communications between a client and server protects the communications against eavesdropping and tampering. The authentication aspect of HTTPS requires a trusted...

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...

HTTP responses compatible with versions of client HTTP requests, (e.g., HTTP/1.0, HTTP/1.1, HTTP/2, HTTP/3). Logging: usually web servers have also the...

fulfill it, if it was correct. HTTP 403 provides a distinct error case from HTTP 401; while HTTP 401 is returned when the client has not authenticated, and...

it easier to maintain the Web Session and supporting HTTP cookies and file uploads. Most client-server sessions are maintained by the transport layer...

the conceptual equivalent to HTTP/1.1 name-based virtual hosting, but for HTTPS. This also allows a proxy to forward client traffic to the right server...

service requesters, called clients. Often clients and servers communicate over a computer network on separate hardware, but both client and server may be on...

allows clients and servers to elect to use HTTP/1.1, 2.0, or potentially other non-HTTP protocols. Maintain high-level compatibility with HTTP/1.1 (for...

it behind a flag. Open-source libraries that implement client or server logic for QUIC and HTTP/3 include On 7 June 2021, LiteSpeed Web Server (and OpenLiteSpeed)...

selecting an HTTP (not HTTPS) URL to the site, the client, such as a Web browser, will automatically upgrade to HTTPS without making an HTTP request, thereby...

from the HTTP protocol to the WebSocket protocol. The WebSocket protocol enables full-duplex interaction between a web browser (or other client application)...

HEAD, the client must ask the user before redirecting. Client request: GET /index.php HTTP/1.1 Host: www.example.org Server response: HTTP/1.1 301 Moved...

indicates a client error, such as a mistyped Uniform Resource Locator (URL). The following two digits indicate the specific error encountered. HTTP's use of...

Caching policy differs between browsers. HTTP does not provide a method for a web server to instruct the client to "log out" the user. However, there are...

information to the subscribed client. Under certain conditions, such as restrictive security policies that block incoming HTTP requests, push technology is...

file is partitioned into one or more segments and delivered to a client using HTTP. A media presentation description (MPD) describes segment information...

Social Operating System. p. 237 HTTP State Management Mechanism. doi:10.17487/RFC6265. RFC 6265. "Persistent client state HTTP cookies: Preliminary specification"...

Client Hints is an extension to the HTTP protocol that allows servers to ask the client (usually a web browser) for information about its configuration...

A web cache (or HTTP cache) is a system for optimizing the World Wide Web. It is implemented both client-side and server-side. The caching of multimedia...

Task Force (IETF) in the RFC 7231 specification. The HTTP 402 status code indicates that the client must make a payment to access the requested resource...

The most common form of HTTP tunneling is the standardized HTTP CONNECT method. In this mechanism, the client asks an HTTP proxy server to forward the...

proxy server is a server application that acts as an intermediary between a client requesting a resource and the server providing that resource. It improves...

transfer. For this reason, a web browser is often referred to as an HTTP client or a user agent. Requisite materials, including text, style sheets, images...

HTTP header field introduced in HTTP/1.1. In the exchange, the client begins by making a cleartext request, which is later upgraded to a newer HTTP protocol...

HTTP/2 Server Push is an optional feature of the HTTP/2 and HTTP/3 network protocols that allows servers to send resources to a client before the client...

rewrite POST to GET. Client request: GET /index.html HTTP/1.1 Host: www.example.com Server response: HTTP/1.1 302 Found Location: http://www.iana.org/domains/example/...

this requirement, many legacy HTTP/1.1 servers do not support pipelining correctly, forcing most HTTP clients to not use HTTP pipelining. The technique was...