How to set request header in php to allow cross-domain

With the continuous advancement of network technology, more and more websites need to interact with other websites to achieve data sharing and resource acquisition. Cross-domain issues have become an important issue in this process, especially with the trend of front-end and back-end separation.

Among back-end languages, PHP is a widely used language. In order to solve the cross-domain problem of PHP, we need to set the request header to allow cross-domain.

In PHP projects, we can use the header() function to set request header information, and use the Access-Control-Allow-Origin option in the header() function to allow cross-domain requests for the specified domain name.

For example, we can add the following code in the PHP code:

header("Access-Control-Allow-Origin: http://www.example.com");

Among them, the specified http://www.example.com is a domain name that allows cross-domain requests. If you need to allow multiple To make cross-domain requests for a domain name, we can use the following code:

header("Access-Control-Allow-Origin: http://www.example.com, http://www.another-example.com");

In addition, we can also set the Access-Control-Allow-Credentials option to allow cross-domain requests to send cookies and other information.

header("Access-Control-Allow-Credentials: true");

It should be noted that this option will only work if the withCredentials option is also set during cross-domain requests.

In addition to the above two options, we can also set other options for the request header, such as Access-Control-Allow-Methods, Access-Control-Allow-Headers, etc. These options can be set according to actual needs.

In general, setting request headers in PHP projects to allow cross-domain problems can effectively solve cross-domain problems and improve the functional scalability and interactivity of the website. It should be noted that when setting request headers, you should follow security principles and set only the specified domain name to allow cross-domain requests to ensure the security of the website.

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