Analyze and solve the problem that Vue external network pictures cannot be displayed

When using Vue to develop websites or applications, we often encounter situations where external network images cannot be displayed normally. This may be caused by a variety of factors. This article explains these problems and how to solve them.

1. Cause of the problem

1. Cross-domain problem

When you use an external URL to obtain image resources in a Vue application, due to the security policy Restrictions, the browser will deny access to resources from other hosts. This is called a cross-domain problem.

This is because by default, JavaScript can only access resources under the same domain name, port and protocol as the current page. This is a security strategy to prevent attackers from attacking malicious websites through cross-domain scripting. .

2. Image link error

Another possible reason is that the image link you provided is incorrect or expired. This is one of the most common errors and is usually caused by an external server changing the image path or deleting the image.

3. Server failure

When the image file you request is located on the server, then when the server fails, your image resources will not be accessible or loaded.

2. Methods to solve cross-domain problems

To solve cross-domain problems, you need to set the HTTP header file of the Vue application to allow access to external resources. If you are a developer who has mastered back-end technology, you can set up CORS (Cross-Origin Resource Sharing) on ​​the server side.

If you do not have server-side technical knowledge, you can use the reverse proxy method to solve cross-domain issues. This approach is generally suitable for development environments because in a production environment you need better workarounds to avoid potential security issues.

The following is how to use a reverse proxy to solve cross-domain problems:

1. Configure the config/index.js file of the Vue application and add the proxyTable field to dev Among the options:

module.exports = {
  dev: {
    // ...
    proxyTable: {
      '/api': {
        target: 'http://example.com',
        changeOrigin: true
      }
    }
  }
}

In the above configuration, we forward all API requests of the application to 'http://example.com/api'. The changeOrigin option is used to instruct the server to fully accept the client request in order to access external resources.

2. Restart the Vue application and check whether the cross-domain problem has been resolved.

3. Other solutions

1. Check whether the image link is correct

As mentioned before, you need to ensure that the link is correct, otherwise you The browser will not be able to access the image resource. You can test the validity of the link by opening it in your browser and checking if you can access the image.

2. Use CDN

Using a CDN (Content Delivery Network) can speed up the loading of your images and reduce the risk of cross-domain issues. You can use open source CDN services like Bootstrap cdn or Google Fonts cdn in your Vue app.

3. Confirm server failure

If you cannot load images in your Vue application, please check whether the corresponding file is damaged or whether the server is faulty. If the server is down, you can contact the administrator for repair or updates.

Conclusion

Dealing with image loading issues in your Vue app may take some effort, but as long as you understand the causes of these issues and learn how to solve them, you will be able to achieve better results User experience and higher application performance. Try the suggestions above and choose the best solution for your Vue app based on your specific situation.

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