The HTTP (Hypertext Transfer Protocol) response message is sent by the server to the client in response to an HTTP request. The HTTP response message consists of several parts, including:
This is the first line of the HTTP response message, and it specifies the HTTP version, status code, and reason phrase of the response. For example:
HTTP/1.1 200 OK
In this example, the HTTP version is “HTTP/1.1”, the status code is “200”, and the reason phrase is “OK”.
Response headers provide additional information about the response, such as the type of data being sent, the date and time of the response, and any caching instructions. Some common response headers include:
Content-Type: text/html Date: Mon, 21 Mar 2023 14:30:00 GMT Cache-Control: max-age=3600
The response body contains the data that the server is sending to the client, such as the contents of an HTML file or an image file. Not all HTTP responses have a response body.
The complete HTTP response message consists of the status line, response headers, and response body (if present) separated by a blank line. The structure of the HTTP response message is important for ensuring that the client can properly interpret and display the server’s response.