How can you detect if a website is using Cloudflare by looking at the source code?
Detecting whether a website is using Cloudflare involves examining specific elements in the website’s source code, HTTP headers, and other accessible information.
Here’s a step-by-step guide on how to do it:
- Open the Page Source: Right-click on the webpage and select “View Page Source” or press
Ctrl+U
(Windows) orCmd+Option+U
(Mac). - Look for Cloudflare-Specific Tags and Scripts: Use
Ctrl+F
(Windows) orCmd+F
(Mac) to search for keywords likecloudflare
andcf-
in the source code. Look for:<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
. - Check HTTP Response Headers: Open your browser’s developer tools by pressing F12, and navigate to the “Network” tab. Reload the page to capture network data. Check for
Server: cloudflare
. - Search for JavaScript Variables and Functions: Scan the source code for JavaScript variables and functions specific to Cloudflare:
Cloudflare
,__cf
,cf.beacon
, andcf_cookie
.