How to detect the request protocol (HTTP or HTTPS) in a App Platform's Web Service Component?

Posted November 9, 2021
Nginx PHP DigitalOcean App Platform

App Platform reverse proxies the requests to the Components but always to the same port, making it impossible to differ the request’s protocol used by just checking whether was the port 443 or 80 that received the request.

For exemple, NGINX allows us to use the Forwarded header to carry that information through a proxy thus letting or application check the protocol originally used to make the request.

Others also work with the X-Forwarded-Proto header with some other headers to carry that information through a proxy, but this one doesn’t seem to work.

That said, how could I check via PHP inside my component (running NGINX + PHP-FPM) which was the protocol originally used to make the request?

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bgever • June 16, 2022

I did a test and found the following headers to be set by the proxy (IPs faked) for my HTTPS endpoint:

x-forwarded-for: 123.123.123.123,100.101.102.103
x-forwarded-proto: https
cdn-loop: cloudflare
do-connecting-ip: 123.123.123.123

Note that the headers are sent lower-case.

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