![]() ![]() Request the server to delete the resource identified by the URL Request the server to store a resource and use the URL as its identifier Request to obtain the response message header of the resource identified by the URL, often used for fault tracking ![]() Request for the resource identified by the URLĪppend new data after the resource identified by the URL The content of the entire message segment is ordinary ASCII text, and the fields are separated by spaces or carriage returns, as shown in the following figure: There are two types of HTTP messages: request messages and response messages. Web pages usually contain a basic HTML file and several reference objects. These files are addressed by a URL address. Objects are simply files (such as graphic files, Java applets, and sound clip files). The browser sends an HTTP request message to the server for the objects contained in the Web page, and the server accepts the request and responds with an HTTP response message containing these objects. Web server is used to store Web objects, each object is addressed by URL, and Web client usually refers to browser. The protocol defines the format of these messages and how the client and server exchange messages. The HTTP protocol is implemented by two parts of the program: a client program and a server program. The application layer protocol of the Web is the Hypertext Transfer Protocol HTTP. This article briefly introduces the theoretical knowledge of the Web application layer protocol, describes in detail the meaning of each field of the HTTP request message and the response message, and selects HTTP related messages from the Wireshark capture packet for analysis.
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