feat: simplify SOP to immediate-effect configuration

internal/middleware/http_test.go

@@ -30,3 +30,34 @@ func TestRequestLoggerUsesStatusLevelAndDurationMilliseconds(t *testing.T) {
 		t.Fatalf("duration_ms is missing from request log")
 	}
 }
+
+func TestCORSAllowsAllOriginsAndAnswersPreflight(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	router.Use(CORS())
+	router.GET("/ping", func(c *gin.Context) { c.Status(http.StatusOK) })
+
+	req := httptest.NewRequest(http.MethodGet, "/ping", nil)
+	req.Header.Set("Origin", "https://crm.example.com")
+	rec := httptest.NewRecorder()
+	router.ServeHTTP(rec, req)
+
+	if got := rec.Header().Get("Access-Control-Allow-Origin"); got != "*" {
+		t.Fatalf("Access-Control-Allow-Origin = %q, want *", got)
+	}
+	if got := rec.Header().Get("Access-Control-Allow-Headers"); got != "*" {
+		t.Fatalf("Access-Control-Allow-Headers = %q, want *", got)
+	}
+
+	preflight := httptest.NewRequest(http.MethodOptions, "/ping", nil)
+	preflight.Header.Set("Origin", "https://crm.example.com")
+	preflightRec := httptest.NewRecorder()
+	router.ServeHTTP(preflightRec, preflight)
+
+	if preflightRec.Code != http.StatusNoContent {
+		t.Fatalf("preflight status = %d, want %d", preflightRec.Code, http.StatusNoContent)
+	}
+	if got := preflightRec.Header().Get("Access-Control-Allow-Origin"); got != "*" {
+		t.Fatalf("preflight Access-Control-Allow-Origin = %q, want *", got)
+	}
+}