What is the 401 error in PHP?

The 401 error code in php means that the server refuses to access the resource requested by the user. The solution: 1. Check the user name and password, verify that the provided user name and password are correct and provide them again; 2. Check the access permissions , check the permission settings in the resource and change if necessary; 3. Clear the cache, clear the browser cache and cookies and try to reconnect; 4. Try again using another browser or device.

Operating system for this tutorial: Windows 10 system, PHP version 8.1, Dell G3 computer.

PHP 401 error code means that the server denies access The resource requested by the user. This error may confuse many users because it is generally believed that the 401 error code only appears when authenticating to the server is required. In fact, this error code can appear in many different network settings, including web applications and APIs.

What is PHP 401 error code

First, let us take a look at the definition of PHP 401 error code. This error code is usually accompanied by a prompt, such as "HTTP Error 401 - Unauthorized" or "401 Unauthorized Error". What it means is: You do not have the credentials required to be authorized to access this page.

Simply put, if a page requires the user to authenticate, but no authentication credentials are provided in the request or the credentials provided are incorrect, then a 401 error code will appear. This typically occurs on pages that require the user to log in to view.

Causes of PHP 401 errors

Unauthorized access: If a user attempts to access certain resources that require login, and the user does not provide login credentials , a 401 error will occur.

Invalid or wrong credentials: 401 will also be returned if the authentication credentials provided are invalid or wrong.

Network failure: Some network failures may cause 401 errors, such as network connection interruption or proxy server failure.

Incorrect permission settings: Server administrators can set permissions that prohibit certain users or groups from accessing certain resources. If a user attempts to access a resource that they are not authorized to access, a 401 error will occur.

Solutions to PHP 401 errors

1. Check the username and password: Verify that the username and password provided are correct and provide them again.

2. Check access permissions: If it is an access permission problem, check the permission settings in the resource and change it as needed.

3. Clear cache: Clear browser cache and cookies, and try to connect again.

4. Try again using other browsers or devices: Sometimes browsers or devices may block access to certain websites, so try using other browsers or devices for testing.

In conclusion, although PHP 401 errors can be frustrating, in most cases, there is a solution to this problem. Finding the cause, understanding the solution, and dealing with the problem as quickly as possible is key.

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