cmd/server sets now environment variables KAPOW_DATA_URL and KAPOW_CONTROL_URL

Remove golinter error S1036: unnecessary guard around map access in 
spawn package

internal/server/data/resource.go

@@ -175,11 +175,7 @@ func setResponseHeaders(w http.ResponseWriter, r *http.Request, h *model.Handler
 	}
 
 	hds := h.Writer.Header()
-	if _, ok := hds[name]; ok {
-		hds[name] = append(hds[name], string(vb))
-	} else {
-		hds[name] = []string{string(vb)}
-	}
+	hds[name] = append(hds[name], string(vb))
 }
 
 func setResponseCookies(w http.ResponseWriter, r *http.Request, h *model.Handler) {

internal/server/user/spawn/spawn.go

@@ -44,7 +44,7 @@ func Spawn(h *model.Handler, out io.Writer) error {
 	if out != nil {
 		cmd.Stdout = out
 	}
-	cmd.Env = append(os.Environ(), "KAPOW_DATA_URL=http://localhost:8082")
+	cmd.Env = os.Environ()
 	cmd.Env = append(cmd.Env, "KAPOW_HANDLER_ID="+h.ID)
 
 	err = cmd.Run()

internal/server/user/spawn/spawn_test.go

@@ -94,6 +94,8 @@ func TestSpawnWritesToStdout(t *testing.T) {
 }
 
 func TestSpawnSetsKapowURLEnvVar(t *testing.T) {
+	t.Skip("Not neccessary as this variable is now set by server at start up")
+
 	h := &model.Handler{
 		Route: model.Route{
 			Entrypoint: locateJailLover(),