pgrade
mechanisms of [ ` upgrade-insecure-requests ` ](/en-
US/docs/Web/HTTP/Headers/Content-Security-Policy/upgrade-insecure-requests) :

http

    
    
    GET / HTTP/1.1
    Host: example.com
    Upgrade-Insecure-Requests: 1
    

The server can now redirect to a secure version of the site. A [ ` Vary `
](/en-US/docs/Web/HTTP/Headers/Vary) header can be used so that the site isn't
served by caches to clients that don't support the upgrade mechanism.

http

    
    
    Location: https://example.com/
    Vary: Upgrade-Insecure-Requests
    

##  Specifications

Specification  
---  
[ Upgrade Insecure Requests  
#  preference  ](https://w3c.github.io/webappsec-upgrade-insecure-
requests/#preference)  
  
##  Browser compatibility

BCD tables only load in the browser  with JavaScript enabled. Enable
JavaScript to view data.

##  See also

  * [ ` Content-Security-Policy ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)
  * CSP [ ` upgrade-insecure-requests ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/upgrade-insecure-requests) directive 

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