Sending a POST request to more than one backend?

1. The problem I’m having:

Not exactly a problem for now, just a question about a feature. I want to collect some data from the network. Data are sent via HTTP POST. I would like to send these data to many (two) backend, replicating the same request to all backend, after authentication and headers manipulations. Is this possible with Caddy and addons?

2. Error messages and/or full log output:

3. Caddy version:

4. How I installed and ran Caddy:

Docker

a. System environment:

Linux

b. Command:

c. Service/unit/compose file:

d. My complete Caddy config:

5. Links to relevant resources:

See mirroring/shadowing · Issue #4211 · caddyserver/caddy · GitHub, that’s not currently supported, but could be implemented as a community plugin.