How to deal with cross-domain request problems encountered in Vue development

How to deal with cross-domain request issues encountered in Vue development

Overview:
In Vue development, we often encounter situations where we need to send cross-domain requests. Cross-domain requests refer to when a resource under a domain name is accessed in the browser, and the domain name of the resource is different from the current domain name. Due to browser origin policy restrictions, cross-domain requests are not allowed by default. This article will introduce how to deal with cross-domain request problems encountered in Vue development.

1. Restrictions of the same-origin policy
   The same-origin policy is one of the browser's restrictions on cross-domain requests initiated by JavaScript. The same-origin policy requires that the domain names, protocols, and ports of the two web pages are exactly the same, otherwise cross-domain requests will occur.
2. Common cross-domain request issues
   In Vue development, common cross-domain request issues include the following situations:

• Development model of front-end and back-end separation , the front end sends requests to the back end through Ajax, and cross-domain requests may occur.
• The front-end uses the Vue development model. When developing locally, if the domain names and ports of the front-end and back-end are different, cross-domain requests will also occur.
• When using the API of a third-party service, if the domain name of the API is different from the domain name of the front-end, cross-domain requests may also occur.

3. Methods to solve cross-domain request problems
   In response to the above situation, we can take the following methods to solve cross-domain request problems:

• Server-side configuration allows cross-domain requests. Corresponding response headers can be set on the server side to allow cross-domain requests. For example, when developing with Node.js on the backend, you can use the cors module to set up allowing cross-domain requests.
• Use proxyTable proxy in Vue development. You can set proxyTable in the webpack configuration file to proxy requests and forward cross-domain requests to the backend interface. For example, in the config/index.js file, you can add the following code:

module.exports = {
  dev: {
    proxyTable: {
      '/api': {
        target: 'http://localhost:8080',
        changeOrigin: true,
        pathRewrite: {
          '^/api': ''
        }
      }
    }
  }
}

In the above code, requests starting with /api are forwarded to http://localhost:8080.

• Use JSONP on the front end for cross-domain requests. If the back-end interface supports JSONP, you can use JSONP on the front-end to send cross-domain requests.

4. Other notes

• Cross-domain requests may cause security issues, so when handling cross-domain requests, you need to pay attention to security.
• In a production environment, cross-domain requests are not allowed due to different domain names. Therefore, when deploying an application, the front-end and back-end need to be deployed under the same domain name to avoid cross-domain request issues.

Conclusion:
In Vue development, we often encounter situations where we need to handle cross-domain request issues. Through methods such as server-side configuration, proxy and JSONP, we can effectively solve cross-domain request issues and ensure the normal operation of the application. At the same time, we also need to pay attention to the security issues that may arise from cross-domain requests, and pay attention to the consistency of domain names when deploying applications to avoid cross-domain request problems.

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