What should I do if "Error: Access Denied" appears when using vue-resource in a Vue application?

Vue is a popular JavaScript framework that helps developers build modern web applications. In Vue, vue-resource is a commonly used HTTP library that provides a convenient way to send HTTP requests and handle responses.

However, when using vue-resource, you may encounter a common error: Error: Access Denied. This error usually occurs when trying to send an HTTP request and it means that you do not have sufficient permissions to access the resource. Below we will introduce some solutions.

1. Check the server settings

"Error: Access Denied" is usually caused by CORS (Cross-Origin Resource Sharing) issues. To resolve this issue, you need to make sure your server is set up correctly. On the server side, you need to allow cross-origin requests. This can be achieved by setting the correct response headers. In the HTTP response, you need to set header information such as Access-Control-Allow-Origin and Access-Control-Allow-Methods to allow requests to be sent via CORS. If you are using Node.js as your server, you can easily achieve this using CORS middleware.

2. Use a proxy

Another way to solve the CORS problem is to use a proxy in the Vue application. In development mode, you can use the configuration file vue.config.js to set the proxy. For example, you can configure your Vue application to run on localhost:8080 and forward all API requests to http://example.com/api:

module.exports = {
devServer: {

proxy: {
  '^/api': {
    target: 'http://example.com',
    changeOrigin: true,
    pathRewrite: { '^/api': '/api' }
  }
}

}
}

This will tell the Vue application to redirect API requests to http://example.com/api when sending them, thus avoiding CORS question.

3. Use JSONP

JSONP is another way to solve CORS problems. It allows you to request resources from different domains directly in your browser. In a Vue application, you can use the vue-jsonp plugin to implement JSONP. First, you need to install vue-jsonp:

npm install vue-jsonp --save

Then use it in your Vue application:

import Vue from 'vue'
import VueJsonp from 'vue-jsonp'

Vue.use(VueJsonp)

Now you can use Vue's VueJsonp method to send requests to different domain names.

Summary

"Error: Access Denied" when using vue-resource in a Vue application usually means that you do not have sufficient permissions to access the resource. This problem is usually caused by CORS issues. To solve this problem, you can check the server settings, use a proxy or use JSONP. Using these techniques, you can easily solve the "Error: Access Denied" problem and make your Vue application work properly.

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