Vivo browser JS loading failed: How to solve the 304 Not Modified cache problem?

Vivo browser JS loading failure troubleshooting

When using vivo's own browser to access the H5 page, some users reported that the JavaScript code could not be loaded and executed normally. This article will conduct in-depth analysis of this problem and provide corresponding solutions.

In the problem description, the developer provides an HTML page containing jQuery and custom JS files. The code in the <script> tag on the page and the alert in the $(document).ready() function can be executed normally, but the code located in the index.js file cannot be executed. The browser console displays a 304 Not Modified error.</script>

The root cause of the problem lies in the HTTP caching mechanism. 304 Not Modified status code indicates that the resource requested by the client has not changed and the server returns the cached version. This usually occurs when using GET requests and the server has a cache policy configured. Since the index.js file is cached by the browser, the browser will not download it again even if the file content is updated, resulting in the latest code being unable to be executed.

There are two main solutions:

Method 1: Server-side configuration

The server side should be configured to disable or control cache policies. This requires modifying the server-side configuration file, and the specific operation depends on the software and environment used by the server. The goal is to prevent the browser from using the cached index.js file, forcing the browser to re-get the latest version from the server.

Method 2: Modify client URL parameters

In the client code, add a timestamp parameter to the requested JS file URL, forcing the browser to think that each request is a different resource. For example, would:

 <script type="text/javascript" src="./index.js"></script>

Modified to:

 <script type="text/javascript" src="./index.js?t=" date></script>

In this way, every time the page is loaded, the URL will change and the browser will re-request the index.js file, thereby avoiding caching problems.

In addition, there may be compatibility issues with the vivo browser itself. If the above method does not work, it is recommended to try using another browser (such as Microsoft Edge) to exclude browser compatibility factors. This helps determine whether the problem stems from the vivo browser's processing mechanism or security policy for specific JS files.

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