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.
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
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