Issue description

Use-case

To test a new version of my endpoint, I want to use the proxy-mirror plugin.

The incoming request is /v1/hello. I'm using the proxy-rewrite plugin to rewrite the path to /hello before sending it to the upstream. However, the priority of proxy-rewrite is 1008; the priority of proxy-mirror 1010.

For this reason, the mirroring is first applied, sending /v1/hello to the mirror host, and only then is the rewrite applied, sending /hello to the nominal upstream. The mirror returns 404, as it doesn't know about v1. I need the opposite, first rewrite, then mirror.

Alternative solutions

• Change the respective priority of proxy-mirror and proxy-rewrite to execute rewrite before mirror.

  Pro: easy fix
  Cons:

  • Breaking change
  • Some users may want to keep the current order

• Move the ordering to configuration. Instead of having the priority in the source code, make it a runtime concern.

  Pro: very flexible
  Cons:

  • Breaking change
  • Require configuring the order, even if the current one fits

• Allow to override default order. Keep the default priority in the source code, but allows overriding it in configuration

  Pro:

  • Very flexible
  • Compatible with existing usage

  Con: design and development effort