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X-Forwarded-Proto

The X-Forwarded-Proto (XFP) header is a de-facto standard header for identifying the protocol (HTTP or HTTPS) that a client used to connect to your proxy or load balancer. Your server access logs contain the protocol used between the server and the load balancer, but not the protocol used between the client and the load balancer. To determine the protocol used between the client and the load balancer, the X-Forwarded-Proto request header can be used.

A standardized version of this header is the HTTP Forwarded header.

Syntax

X-Forwarded-Proto: <protocol>

Directives

<protocol>
The forwarded protocol (http or https).

Examples

X-Forwarded-Proto: https

Other non-standard forms:

# Microsoft
Front-End-Https: on

X-Forwarded-Protocol: https 
X-Forwarded-Ssl: on 
X-Url-Scheme: https

Specifications

Not part of any current specification. The standardized version of this header is Forwarded.

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
X-Forwarded-Proto ? ? ? ? ? ?
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
X-Forwarded-Proto ? ? ? ? ? ?

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto