Merge #472

472: feat(http): Distinct app and internal error codes in the handleError function r=48d90782 a=48d90782

This PR introduces distinct error codes for the app and internal RR errors.
Errors: 
```go
roadrunner.ErrNoAssociatedPool
roadrunner.ErrAllocateWorker
roadrunner.ErrWorkerNotReady
roadrunner.ErrEmptyPayload
roadrunner.ErrPoolStopped
roadrunner.ErrWorkerAllocateTimeout
roadrunner.ErrAllWorkersAreDead
```
now associated with the internal error codes. All other errors are application errors.
Some types of errors are impossible to distinguish in the RR1, for example `json.Unmarshall` internal error or similar.
The `.rr.yaml` now contain two more options for the errors.
```yaml
http:
    internalErrorCode: 502,
    appErrorCode: 502
```
Default behavior unchanged (500 error code as before), but now might be overridden.
closes #471 

Co-authored-by: Valery Piashchynski <[email protected]>

1 files changed, 6 insertions, 1 deletions

diff --git a/service/http/service.go b/service/http/service.go
index 25a10064..7a175dcb 100644
--- a/service/http/service.go
+++ b/service/http/service.go
@@ -118,7 +118,12 @@ func (s *Service) Serve() error {
 		s.rr.Attach(s.controller)
 	}
 
-	s.handler = &Handler{cfg: s.cfg, rr: s.rr}
+	s.handler = &Handler{
+		cfg:               s.cfg,
+		rr:                s.rr,
+		internalErrorCode: s.cfg.InternalErrorCode,
+		appErrorCode:      s.cfg.AppErrorCode,
+	}
 	s.handler.Listen(s.throw)
 
 	if s.cfg.EnableHTTP() {