Respond with the correct 200 OK code for HEAD requests

Fixes #48

concat_test.go

@@ -69,7 +69,7 @@ func TestConcatPartial(t *testing.T) {
 		ReqHeader: map[string]string{
 			"Tus-Resumable": "1.0.0",
 		},
-		Code: http.StatusNoContent,
+		Code: http.StatusOK,
 		ResHeader: map[string]string{
 			"Upload-Concat": "partial",
 		},
@@ -165,7 +165,7 @@ func TestConcatFinal(t *testing.T) {
 		ReqHeader: map[string]string{
 			"Tus-Resumable": "1.0.0",
 		},
-		Code: http.StatusNoContent,
+		Code: http.StatusOK,
 		ResHeader: map[string]string{
 			"Upload-Concat": "final; http://tus.io/files/a http://tus.io/files/b",
 			"Upload-Length": "10",

head_test.go

@@ -40,7 +40,7 @@ func TestHead(t *testing.T) {
 		ReqHeader: map[string]string{
 			"Tus-Resumable": "1.0.0",
 		},
-		Code: http.StatusNoContent,
+		Code: http.StatusOK,
 		ResHeader: map[string]string{
 			"Upload-Offset": "11",
 			"Upload-Length": "44",

unrouted_handler.go

@@ -313,7 +313,7 @@ func (handler *UnroutedHandler) HeadFile(w http.ResponseWriter, r *http.Request)
 	w.Header().Set("Cache-Control", "no-store")
 	w.Header().Set("Upload-Length", strconv.FormatInt(info.Size, 10))
 	w.Header().Set("Upload-Offset", strconv.FormatInt(info.Offset, 10))
-	w.WriteHeader(http.StatusNoContent)
+	w.WriteHeader(http.StatusOK)
 }
 
 // PatchFile adds a chunk to an upload. Only allowed enough space is left.