> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gcore.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Identify the client protocol with X-Forwarded-Proto

The `X-Forwarded-Proto` header identifies the protocol (HTTP or HTTPS) that a client used to connect to a CDN edge server.

Gcore CDN edge servers include `X-Forwarded-Proto` on every origin request. The value is `http` or `https`.

If a client supplies `X-Forwarded-Proto`, the edge server overwrites it with the actual client-to-CDN protocol instead of appending another value. Origin applications can trust the Gcore-provided value when the origin accepts requests only from Gcore CDN; direct origin requests can contain a spoofed header.

Origin or application logic can read the header to:

* Redirect HTTP clients to HTTPS
* Serve different content based on the request protocol