minor: modified ErrInvalidRequestBody

http/errors.go

@@ -5,7 +5,7 @@ import (
 )
 
 var (
-	ErrInvalidRequestBody         = errors.New("invalid request body")
+	ErrInvalidRequestBody         = "invalid request body: %v"
 	ErrNilRequestBody             = errors.New("request body cannot be nil")
 	ErrInDevelopment              = errors.New("in development")
 	ErrInvalidAuthorizationHeader = errors.New("invalid authorization header")