What should I do if 'Uncaught (in promise) Error: Network Error' occurs when using vue-resource in a Vue application?

Vue is a modern JavaScript framework that has become an integral part of front-end development. Vue provides rich functionality and easy-to-use APIs, allowing developers to build applications quickly and efficiently. However, when using a Vue application, you may encounter "Uncaught (in promise) Error: Network Error" in Vue-resource, which may cause serious problems in the application. This article will explore the possible causes and solutions to this problem when using vue-resource in a Vue application.

This error usually means a problem: Vue-resource cannot connect to the server. This can be caused by a variety of issues. Here are some possible reasons for this error:

1. Cross-origin request issue

Vue-resource cannot be used cross-domain by default due to browser security restrictions Cookies are used in requests. If you want to use cookies in cross-domain requests, you need to set the cross-domain request server to allow the use of cookies. You can use a proxy to solve cross-domain issues:

//Vue.config.js

module.exports = {
    devServer: {
        proxy: {
            '/api/*': {
                target: 'http://localhost:3000',
                changeOrigin: true,
                secure: false,
                pathRewrite: {
                    '^/api': ''
                },
                cookieDomainRewrite: {
                    "*": ""
                }
            }
        }
    }
}

In this way, your request will be proxied to the local server using port 3000.

2. Server Error

If your server cannot connect or encounters any errors, Vue-resource will not be able to connect to it and cause an error. You can try to manually access the corresponding API in the browser to determine the server problem.

3. Network Problems

Network connection and related issues can cause an inability to connect to the server. Please check your network settings to make sure your network connection is working properly.

Solution:

1. Ensure correct configuration

Check whether the Vue-resource configuration is correct. Make sure you provide the correct URL and use the correct request method (GET, POST, etc.), and also make sure Vue-resource is introduced at the correct location in your project.

2. Using the health check mechanism

You can set up a health check mechanism to ensure server availability. If the server is unavailable, you should receive an alert notification.

//使用健康检查
setInterval(() => {
    this.$http.get('/healthcheck')
      .then(response => {
        console.log(response)
      })
      .catch(error => {
        console.error(error)
        alert('服务器错误') // 通知用户服务器问题
      })
}, 10000)

3. Remove cache

Remove cache Using cache may cause network errors. The cache can be removed before each request to ensure that old data is not used.

this.$http.get('/url', { headers: { 'Cache-Control': 'no-cache' } })
    .then(response => {
        console.log(response)
    })
    .catch(error => {
        console.error(error)
})

Conclusion:

Regardless of any of the above problems, Vue-resource will return the "Uncaught (in promise) Error: Network Error" error. This situation may affect the normal functionality of the Vue application and may cause the application to crash. Handle this problem by using health checks and taking the right solutions.

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