HTTP status code and status code

HTTP status code and status code

1. Message 2. Successful 3. Redirection 4. Request error 5. Server Error

304: the response is forbidden to contain a message body. If the client sends a conditional GET request and the request is allowed, the content of the document (since the last access or according to the request conditions) if the status code is not changed, the server should return this status code.
305: the requested resource can be accessed only through the specified proxy.
400: The syntax is incorrect. The current request cannot be understood by the server. Unless modified, the client should not submit this request again, or the request parameters are incorrect.
403: the server has understood the request but refused to execute it.
404: The request failed. The requested resource is not found on the server.
500: the server encountered an unexpected situation, which made it unable to process the request. Generally, this problem occurs when the source code of the server is incorrect.