HTTP HTTP (Hypertext Transfer Protocol) is a communication protocol used to send messages between the client and server, mainly used for the web. It’s stateless, meaning each request is independent, which is why web browsers often use cookies to save state.
Request Structure Request Line: Method, URI, HTTP version (e.g., GET /index.html HTTP/1.1). Headers: Metadata about the request. Body (Optional): Data for POST, PUT, PATCH requests. Response Structure Status Line: HTTP version, status code, reason phrase (e.g., HTTP/1.1 200 OK). Headers: Metadata about the response. Body (Optional): Response data (HTML, JSON, etc.). Methods GET: Retrieve a resource. Should only retrieve data and not have side effects. POST: Submit data to be processed. PUT: Replace a resource. DELETE: Delete a resource. PATCH: Partially modify a resource. HEAD: Retrieve headers only. OPTIONS: Describe communication options. HTTP Headers HTTP headers are key-value pairs providing additional information about requests and responses.
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