X-Forwarded-Proto

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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.

Header type	Request header
Forbidden header name	no

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 compatibility

Update compatibility data on GitHub

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

Legend

Compatibility unknown: Compatibility unknown
Non-standard. Expect poor cross-browser support.: Non-standard. Expect poor cross-browser support.