Add logs when error is generated in error handler

Gopkg.lock

@@ -764,7 +764,6 @@
   version = "v1.3.7"
 
 [[projects]]
-  branch = "master"
   name = "github.com/jjcollinge/servicefabric"
   packages = ["."]
   revision = "8eebe170fa1ba25d3dfb928b3f86a7313b13b9fe"
@@ -1250,7 +1249,7 @@
     "roundrobin",
     "utils"
   ]
-  revision = "c2414f4542f085363f490048da2fbec5e4537eb6"
+  revision = "adbef6bedf021985587c3c18c9d4b84b2d78f67c"
 
 [[projects]]
   name = "github.com/vulcand/predicate"
@@ -1739,6 +1738,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "53d03fd81596d9560d751bc1102615990a91b0779cff079784a9a1c6641bd503"
+  inputs-digest = "a3429eccf578f09c7c521a32f81df1af5f0a24cb8c9702b7b768f3db34153216"
   solver-name = "gps-cdcl"
   solver-version = 1

vendor/github.com/vulcand/oxy/forward/rewrite.go

@@ -85,6 +85,10 @@ func forwardedPort(req *http.Request) string {
 		return port
 	}
 
+	if req.Header.Get(XForwardedProto) == "https" || req.Header.Get(XForwardedProto) == "wss" {
+		return "443"
+	}
+
 	if req.TLS != nil {
 		return "443"
 	}

vendor/github.com/vulcand/oxy/utils/handler.go

@@ -4,6 +4,8 @@ import (
 	"io"
 	"net"
 	"net/http"
+
+	log "github.com/sirupsen/logrus"
 )
 
 type ErrorHandler interface {
@@ -28,6 +30,7 @@ func (e *StdHandler) ServeHTTP(w http.ResponseWriter, req *http.Request, err err
 	}
 	w.WriteHeader(statusCode)
 	w.Write([]byte(http.StatusText(statusCode)))
+	log.Debugf("'%d %s' caused by: %v", statusCode, http.StatusText(statusCode), err)
 }
 
 type ErrorHandlerFunc func(http.ResponseWriter, *http.Request, error)