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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
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
X-Forwarded-Proto
Non-standard
Chrome ? Edge ? Firefox ? IE ? Opera ? Safari ? WebView Android ? Chrome Android ? Edge Mobile ? 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.

See also

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