Checking if a Page is Served from Varnish

Varnish Cache speeds up websites by working as a page storage system and distributor of popular pages. GEOV1 contains two signature response headers whichываֺX-Varnish and Age that verify Varnish Cache content delivery. The analysis of Varnish logs reveals complete information about cache strike and fail data. The guide presents operational approaches for Varnish detection along with methods to enhance performance which results in better site speed and effective troubleshooting for faster user experiences.

Inspecting Response Headers

Using Browser Developer Tools

The response headers accessible through F12 developer tools serve as the first clue to confirm page delivery from Varnish.

Steps:

• Open Developer Tools (F12) in your browser.
• Navigate to the Network tab.
• Click reload on the page while maintaining the Developer Tools active.
• Check the request URL and analyze its headers in the display.

Expected Output if Served from Varnish:

Key Headers

• X-Varnish: Shows the request ID in Varnish. The request led to a HIT when two numbers appeared together in the response but it resulted in a MISS with one number.
• Age: shows in seconds how long Varnish has stored the content. Responses from a Varnish cache show an age value above 0
• • X-Magento-Cache-Debug header: Magento platforms can be display Caching behavior:
  • HIT: Page served from Varnish cache.
  • MISS: Page fetched from the backend.
  • PASS: The request was forwarded to the backend without caching.

Analyzing Logs

Using varnishlog Command

Server access allows you to explore log files which offer critical information about processing requests. Users can inspect log data related to particular URLs through the executable “Varnishlog Command” .

Through this command users receive information about Varnish’s request management which incorporates headers along with referrer URLs and status codes together with cache statuses. Reading logs will provide all browser headers and extra debugging information alongside them.

Conclusion

The determination between Varnish server and backend source of content delivery becomes possible through response header examination and log analysis. The information obtained from these examinations enables users to solve caching problems and achieve better website performance.

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