Common HTTP error codes in PHP and their solutions

With the development of the Internet, the HTTP protocol has become the basis of Web applications, and HTTP error codes, as an important part of the HTTP protocol, have also become one of the problems that Web developers often face. This article will mainly introduce common HTTP error codes and their solutions in PHP.

HTTP error code usually consists of 3 digits, indicating the status code returned by the server to the client. According to the different error codes, they can be divided into five categories: 1xx (information prompt), 2xx (success), 3xx (redirect), 4xx (client error) and 5xx (server error). The following is a detailed introduction to common error codes in PHP and their solutions:

1xx (information prompt)

100 Continue: The server has received the request header, and the client should continue to send the request body. .

101 Switching Protocols: The server has understood the request and will comply with the client's request and convert it to another protocol.

These two error codes can be regarded as temporary responses, and generally there will be no problems.

2xx (Success)

200 OK: The request has been successful, and the response header or data body expected by the request will be returned with this response.

201 Created: The request has been fulfilled and the resource has been successfully created.

202 Accepted: The request has been accepted, but has not been processed yet.

203 Non-Authoritative Information: The server has successfully processed the request, but the information returned may come from another source.

204 No Content: The server successfully processed the request, but does not need to return any entity content.

205 Reset Content: The server successfully processed the request, but needs to reset all content on the page.

206 Partial Content: The server has successfully processed a partial GET request.

2xx series error codes mostly indicate that the request has been successfully processed by the server, so you need to ensure that there are no errors in the code.

3xx (Redirect)

301 Moved Permanently: The requested web page has been permanently moved to a new location.

302 Found: The requested web page has been temporarily moved to a new location.

303 See Other: The requested web page must be obtained through the URL provided in the location field.

307 Temporary Redirect: The requested page has been temporarily moved to a new location.

This type of error code is usually caused by the web page being moved and requiring redirection. You need to check whether the URL jumped in the code is correct.

4xx (Client Error)

400 Bad Request: The request is invalid and the server does not understand the client's request syntax.

401 Unauthorized: The request requires authentication.

403 Forbidden: The server refused the request.

404 Not Found: The requested resource does not exist.

408 Request Timeout: The request timed out.

This type of error code is due to an error in the request sent by the client or the requested resource has been deleted. Therefore, you need to check whether the requested URL in the code is correct or whether the requested parameters comply with the specifications.

5xx (server error)

500 Internal Server Error: Server internal error.

502 Bad Gateway: Gateway error.

503 Service Unavailable: The service is unavailable.

504 Gateway Timeout: Gateway timeout.

This type of error code is due to a problem within the server, and you need to check whether there are errors in the server-side code.

In short, although HTTP error codes may cause the client and server to be unable to exchange data normally, by understanding and analyzing the error codes, we can quickly locate the problem and solve the problem quickly.

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