全英文 介绍HTTP传输协议PPT
HTTP, short for Hypertext Transfer Protocol, is the foundation of data commun...
HTTP, short for Hypertext Transfer Protocol, is the foundation of data communication on the World Wide Web. Designed to transfer information between servers and clients in a reliable and efficient manner, HTTP has been a crucial component in the development of modern web-based applications. In this article, we provide a comprehensive introduction to the HTTP transmission protocol.HTTP BasicsHTTP is a protocol based on the Transmission Control Protocol (TCP). It utilizes the client-server model, where a client makes a request for information from a server, which then responds with the relevant data. HTTP is a stateless protocol, meaning that each request is treated independently of any previous request-response pair.HTTP communication occurs through the exchange of messages, called requests and responses. A request is sent by the client to request specific content from the server, while a response is sent by the server to provide the requested content.HTTP RequestAn HTTP request message is composed of three parts:Request MethodThis indicates the action that the client wants to perform on the server. The most commonly used request methods are GET, POST, PUT, DELETE, and HEADRequest URIThis identifies the resource on the server that the client wants to access. It is also known as the Universal Resource Identifier (URI)Request HeadersThese provide additional information about the request, including the type of data expected, the length of the message body, and information related to caching and securityHere's an example of an HTTP request message in its entirety:HTTP ResponseThe server responds to the client's request with an HTTP response message, which also contains three parts:Response Status CodeThis indicates the status of the request, whether it was successfully processed or if there was an error. The most common status codes are 200 (OK), 301 (Moved Permanently), 404 (Not Found), and 500 (Internal Server Error)Response HeadersThese provide additional information about the response, including the type of content returned (e.g., HTML, JSON), the length of the message body, and caching directivesResponse BodyThis contains the actual content being transmitted. It could be HTML markup, an image, JSON data, or any other type of informationHere's an example of an HTTP response message:HTTP Communication ProcessHTTP communication typically follows these steps:Client ConnectsThe client establishes a TCP connection with the server by sending an opening handshake to the server using the HTTP version and other parametersRequest TransmissionThe client sends the HTTP request message to the server, including the request method, URI, and headers along with any data needed for processingResponse TransmissionThe server processes the request and sends back an HTTP response message with the appropriate status code, headers, and response bodyConnection ClosureAfter exchanging data, both parties close the TCP connection by sending a closing handshake. This concludes the HTTP communication sessionSummaryThe Hypertext Transfer Protocol (HTTP) is the foundation of data communication on the World Wide Web. It provides a reliable and efficient mechanism for transferring information between web servers and clients using the client-server model. HTTP is
