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# HTTP Request Methods HTTP request methods define the communication mode between clients and servers. According to HTTP standards, HTTP requests can use multiple request methods. Here is a list of common HTTP request methods: | No. | Method | Description | | --- | --- | --- | | 1 | GET | Retrieve resources from the server. Used to request data without making changes. For example, fetching web pages or images from the server. | | 2 | POST | Send data to the server to create new resources. Commonly used for submitting form data or uploading files. The sent data is included in the request body. | | 3 | PUT | Send data to the server to update existing resources. If the resource doesn't exist, it creates a new one. Unlike POST, PUT is usually idempotent, meaning multiple identical PUT requests won't produce different results. | | 4 | DELETE | Delete specified resources from the server. The request contains the identifier of the resource to be deleted. | | 5 | PATCH | Make partial modifications to resources. Similar to PUT but PATCH only changes part of the data rather than replacing the entire resource. | | 6 | HEAD | Similar to GET, but the server only returns response headers without the actual data. Used to check resource metadata (e.g., verify resource existence, view response header information). | | 7 | OPTIONS | Returns the HTTP methods supported by the server. Used to check which request methods the server supports, often used for CORS preflight requests. | | 8 | TRACE | Echoes the request received by the server, mainly for diagnostics. Clients can view the processing path of the request in the server. | | 9 | CONNECT | Establishes a tunnel to the server, typically used for HTTPS connections. Clients can send encrypted data through this tunnel. | ## Request Methods Defined by Each Version ### HTTP/1.0 HTTP/1.0 defines the following three request methods: * **GET** - Request specified resources. * **POST** - Submit data to process requests. * **HEAD** - Request response header information for resources. ### HTTP/1.1 HTTP/1.1 introduced more methods: * **GET** - Request specified resources. * **POST** - Submit data to process requests. * **HEAD** - Request response header information for resources. * **PUT** - Upload files or update resources. * **DELETE** - Delete specified resources. * **OPTIONS** - Request supported methods from the server. * **TRACE** - Echo received requests, mainly for diagnostics. * **CONNECT** - Establish a tunnel for proxy server communication, typically used for HTTPS. ### HTTP/2 HTTP/2 essentially continues using HTTP/1.1 methods but optimizes the protocol to improve transmission efficiency and speed. HTTP/2 also introduces new features like multiplexing, header compression, and server push. ### HTTP/3 HTTP/3 is implemented based on the QUIC protocol and continues using HTTP/2 methods. HTTP/3 mainly improves the transport layer by using UDP instead of TCP to enhance transmission speed and reliability.