How to solve the 'Network Error' caused by Vue Axios across domains

The method to solve the cross-domain problem of Vue Axios includes: Configuring the CORS header on the server side to use the Axios proxy on the server to use JSONP on the WebSocket on the CORS plug-in

How to solve the "Network Error" caused by Vue Axios across domains

When using Vue Axios for cross-domain requests, you may encounter a "Network Error" error, which is usually caused by the browser security mechanism. Here is how to resolve this issue:

1. Configure CORS header on the server side

CORS (cross-domain resource sharing) is a browser security mechanism designed to prevent malicious websites from accessing user data. To solve the cross-domain problem, the server needs to configure CORS in the response header.

The specific configuration method varies by server type. For example, for a Node.js server, you can install the cors module and use the following code:

 <code>app.use(cors({ origin: 'https://example.com', methods: ['GET', 'POST', 'PUT', 'DELETE', 'HEAD', 'OPTIONS'], headers: ['Content-Type', 'Authorization'] }));</code>

2. Use Axios Agent

If CORS cannot be configured on the server side, you can use the Axios proxy to solve cross-domain problems. Axios provides proxy options that allow proxying requests to another server.

 <code>const axios = require('axios'); const instance = axios.create({ proxy: { host: 'proxy.example.com', port: 8080 } });</code>

3. Use JSONP

JSONP (JSON with Padding) is a cross-domain alternative solution. It allows loading of JSON data from different domain names in script tags.

 <code>$.ajax({ url: 'https://example.com/api/data', dataType: 'jsonp', success: function(data) { console.log(data); } });</code>

4. Use WebSocket

WebSocket is a full duplex communication protocol that allows for persistent connections between the browser and the server. It is not restricted by cross-domain and can therefore be used for cross-domain communication.

5. Use the CORS plugin

For Chrome and Firefox browsers, you can use the CORS plugin to temporarily allow cross-domain requests.

Notes:

• Make sure your browser supports CORS.
• Access-Control-Allow-Origin must be included in the server response header.
• The request method must match the methods allowed in the CORS configuration.

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