How to use Nginx to configure the same origin policy to protect front-end security

As the complexity of front-end applications continues to increase, the security issues of Web applications are becoming more and more important. The same-origin policy is an important security measure to avoid security issues such as cross-site scripting attacks. Nginx is a powerful web server software. This article will introduce how to use Nginx to configure the same-origin policy to protect front-end security.

1. Same-origin policy

The same-origin policy is a security principle in web development that is used to restrict how documents or scripts under one domain name interact with resources under another domain name. . Homology means that the protocol, domain name and port are all the same, which is called "completely consistent".

The same origin policy can prevent malicious attacks between websites. For example, a hacker may write a malicious JavaScript program and embed it into some web pages. When users visit these web pages, the JavaScript program will steal sensitive information from the user's computer.

2. Nginx’s same-origin configuration

One of the ways to configure the same-origin policy is to use the reverse proxy function of Nginx. A reverse proxy is a proxy server located on the server side that proxies the connection between the client and the server and isolates requests from different sources.

The following will introduce how to use Nginx to configure the same-origin policy to protect front-end security:

1. Configuring Nginx
   First, you need to add the following content to the Nginx configuration file:

location / {

add_header 'Access-Control-Allow-Origin' 'http://localhost:8080';
add_header 'Access-Control-Allow-Credentials' 'true';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';

}

This configuration file snippet gives us the following information:

Access-Control-Allow-Origin: Specifies allowed access The external domain URI of this resource can be set to *.

Access-Control-Allow-Credentials: Specifies whether requests allowing cross-domain access are allowed to carry identity information.

Access-Control-Allow-Methods: Specify allowed HTTP request methods.

Access-Control-Allow-Headers: Specify the allowed request header fields.

2. Configure the front-end application
   Next, add the following content to the JavaScript code of the front-end application:

var xhr = new XMLHttpRequest();
xhr .open('POST', 'http://localhost:8080/api/save', true);
xhr.withCredentials = true;
xhr.setRequestHeader('Content-Type', 'application/json ');
xhr.onreadystatechange = function () {

if (xhr.readyState === 4 && xhr.status === 200) {
    console.log(xhr.responseText);
}

};
xhr.send(JSON.stringify({name: 'John', age: 26}));

This code uses the XMLHttpRequest object to initiate a POST request. The request URI is http://localhost:8080/api/save, in which the withCredentials attribute is set to true, indicating that the request can carry identity information.

3. Test the application
   Finally, launch the application and visit the front-end application’s page. In the browser's developer tools, you can see that the request header contains information such as Access-Control-Allow-Origin and Access-Control-Allow-Credentials, which verifies the correctness of the Nginx configuration.

Through the above steps, you can use Nginx to configure the same-origin policy to protect front-end security.

3. Summary

The same origin policy is an important security measure in web development, and Nginx can help us configure the same origin policy. In actual applications, in addition to configuring the same-origin policy, we also need to use other security measures, such as SSO single sign-on, CSRF prevention, XSS prevention, etc., to ensure the security of web applications.

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