HTTP response header
The X-Varnish HTTP header allows you to find the correct log-entries for the transaction. For a cache hit X-Varnish will contain both the ID of the current request and the ID of the request that populated the cache. It makes debugging Varnish a lot easier.
Header usage statisticsX-Varnish-Cache response header information and usage statistics.
|Websites using header X-Varnish-Cache||37,489|
|Percentage of websites that use X-Varnish-Cache header||<0.1%|
|Total discovered header values||130|
|Header uses directives||No|
|Header values are unique or random||No|
|Most popular in the country|| NL|