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, 2 insertions, 4 deletions

diff --git a/service/http/request.go b/service/http/request.go
index 8da5440f..f3fff198 100644
--- a/service/http/request.go
+++ b/service/http/request.go
@@ -8,7 +8,6 @@ import (
 	"net/url"
 	"strings"
 
-	json "github.com/json-iterator/go"
 	"github.com/sirupsen/logrus"
 	"github.com/spiral/roadrunner"
 	"github.com/spiral/roadrunner/service/http/attributes"
@@ -136,13 +135,12 @@ func (r *Request) Close(log *logrus.Logger) {
 func (r *Request) Payload() (p *roadrunner.Payload, err error) {
 	p = &roadrunner.Payload{}
 
-	j := json.ConfigCompatibleWithStandardLibrary
-	if p.Context, err = j.Marshal(r); err != nil {
+	if p.Context, err = json.Marshal(r); err != nil {
 		return nil, err
 	}
 
 	if r.Parsed {
-		if p.Body, err = j.Marshal(r.body); err != nil {
+		if p.Body, err = json.Marshal(r.body); err != nil {
 			return nil, err
 		}
 	} else if r.body != nil {