## What changed?
Forward originally received HTTP headers for Nexus CompleteOperation
requests.
## Why?
This avoids header sanitization that occurs in the interceptors as those
headers are still needed on the forwarded request.
## How did you test it?
- [x] built
- [ ] run locally and tested manually
- [x] covered by existing tests
- [ ] added new unit test(s)
- [ ] added new functional test(s)