Forwarding User Auth ID as a HTTP header

[BrianLesko]

1. The problem I’m having:

I am trying to forward my user auth ID to a HTTP header so that my backend server can use it.

Here is the section of my Caddyfile in question:

:80
root * /home/myuser/website
file_server

handle_path /app* {
  basic_auth {
    user password
  }
  header X-User-ID "{http.auth.user.id}"
  root * /home/myuser/website
  file_server {
    index file.html
  }
}

Note: ive left out some other handle paths

I have also tried removing the quotes around {http.auth.user.id}
I have also tried adding the following line after asking chatGPT for help

header Access-Control-Expose-Headers "X-User-ID"

2. I am using some JS code client side to retrieve and log the header from the server, this is the response:

X-User-ID:"{http.auth.user.id}"

I also used curl -I and got the same result.

3. Caddy version:

v2.8.4

4. How I installed and ran Caddy:

I installed caddy with apt and I am running caddy with caddy run

a. System environment:

I am running on Ubuntu 22.04 on a raspberry pi

[francislavoie]

Sorry for the wait, I had a busy week.

Looks like you already got your answer here though:

Auth User ID not resolved when forwarding as a custom header

Basically it’s a directive ordering issue.