Recently, I noticed that certain websites incorporate a CSS tag such as style.css?ver=1. Can you explain the significance of this?
What exactly is the purpose of adding ?ver=1 to the CSS tag?
Could you provide instructions on how to implement this in code?
To prevent CSS caching.
When a website updates its CSS, the version number is increased to force the browser to fetch the new file instead of using the cached old version.
Otherwise, a browser might load new HTML code but still use the outdated CSS, causing certain elements of the site to appear broken.
By appending '?ver=1' to the end of a URL in an HTTP request, it appears as though the request is a GET query with parameters. However, browsers and proxies that follow best practices will not cache parameterized queries. Additionally, these well-behaved browsers and proxies should also adhere to response headers like 'Cache-control: no-cache', 'Expires', 'Last-Modified', and 'ETag', which are all designed to dictate proper caching behavior.
The usage of '?ver=1' as a method is considered inefficient because it serves as a costly workaround for site developers who may be unaware or too lazy to implement the correct response headers. Essentially, this approach results in the CSS file being requested on every page load, even though CSS files rarely, if ever, change in practice.
In light of this, my advice is simple: Avoid using this method altogether.
The reason for including ?ver=1 in the link is to dynamically update the css file version. By incrementing the version number, it ensures that clients download the latest style.css file instead of using a cached version.
When working on a web application using HTML, CSS, or other technologies and incorporating external CSS or JS files, you may encounter a situation where changes made to these files are not immediately reflected in the browser.
This occurs because the browser often relies on cached versions of the .css and .js files instead of downloading the latest updates. This can lead to your recent modifications not appearing as expected.
<link rel="stylesheet" href="style.css?v=1.1">
In the scenario above, by including "?v=1.1" after "style.css" in the link tag, the browser is prompted to recognize this as a new version of the file and download it fresh, ensuring that any changes to the stylesheet or script file are properly displayed.
In my opinion, the addition of ?ver=1 indicates the version number of the web application. Whenever a new build is generated, the app can be updated with the new ver to reflect the changes. This ensures that the browser loads the latest CSS file instead of using the cached one (which may have a different file name).
If you're interested, you can take a look at this website:
In my opinion, a more efficient approach would involve incorporating a hash created from the file size or a checksum derived from the file content or last-modified date. This way, there is no need to constantly update a version number; instead, the number can be dynamically generated based on the evolving characteristics of the file.
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