How thinkphp completes cross-domain requests

1. Header class

In the thinkphp framework, you can use the Header class to set the response header to realize the function of cross-domain requests. The specific method is to add the following code to the controller method:

header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");

Among them, the first line of code indicates that cross-domain requests from all sources are allowed, or it can be set to a specific source; the second line of code indicates that cross-domain requests are allowed Request header information carried by the request. After setting this up, you can implement basic cross-domain requests.

2. Third-party libraries

In addition to using the Header class to set up cross-domain requests, you can also use third-party libraries to simplify this process. The following takes the mainstream CORS (Cross-Origin Resource Sharing) library cors extension as an example to introduce how to use a third-party library to implement cross-domain requests.

1. Install cors extension

Open the command line window and execute the following command:

composer require topthink/think-cors

2. Configuration cors expansion

In the project's config folder, create a cors.php file and enter the following code:

<?php

return [
    // 允许的请求域名
    &#39;allow_origin&#39;      => [&#39;*&#39;],
    // 允许的请求头信息
    &#39;allow_headers&#39;     => &#39;Origin, X-Requested-With, Content-Type, Accept&#39;,
    // 允许的请求方法
    &#39;allow_methods&#39;     => &#39;GET, POST, PUT, DELETE, PATCH&#39;,
    // 是否允许发送cookie
    &#39;allow_credentials&#39; => true,
    // 跨域请求缓存时间
    &#39;max_age&#39;           => 3600,
];

Among them, $allow\_origin represents the allowed request Domain name, can be set to a specific domain name, or can be set to the wildcard "*"; $allow\_headers represents the allowed request header information, $allow\_methods represents the allowed request methods, $allow\_credentials represents whether sending cookies is allowed, $ max\_age represents the cross-domain request cache time.

3. Modify the configuration file

In the config folder of the project, find the app.php file, the configuration is as follows:

return [
    // ...
    'middleware' => [
        // ...
        \think\middleware\Cors::class,
    ],
];

4. Call cors extension

In the controller method that requires cross-domain requests, you can directly call the method in cors extension to realize the setting of cross-domain requests:

use think\facade\Cors;

public function index() {
    Cors::allowAllOrigin();
    return json(['code' => 200, 'msg' => 'success']);
}

After setting this, cross-domain requests can be implemented.

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