Update app.py

app.py

@@ -53,27 +53,31 @@ def corsproxy():
     if not url:
         return "url パラメータが必要です", 400
 
-    # URLが http/https のみ許可（安全のため）
     if not url.startswith("http://") and not url.startswith("https://"):
         return "http または https のURLのみ使用できます", 400
 
     try:
-        # 元URLへ転送
         resp = requests.get(url, headers=request.headers, timeout=10)
 
-        # CORS対応レスポンスヘッダを付与
-        headers = {
-            "Access-Control-Allow-Origin": "*",
-            "Access-Control-Allow-Headers": "*",
-            "Access-Control-Allow-Methods": "GET, POST, OPTIONS"
-        }
+        # 元のレスポンスヘッダを継承
+        response = Response(resp.content, resp.status_code)
 
-        return Response(resp.content, resp.status_code, headers=headers)
+        # CORSヘッダを追記（上書きしない）
+        response.headers["Access-Control-Allow-Origin"] = "*"
+        response.headers["Access-Control-Allow-Headers"] = "*"
+        response.headers["Access-Control-Allow-Methods"] = "GET, POST, OPTIONS"
+
+        # ★ Content-Typeを元のままに設定 ★
+        if "Content-Type" in resp.headers:
+            response.headers["Content-Type"] = resp.headers["Content-Type"]
+
+        return response
 
     except Exception as e:
         return f"エラー: {str(e)}", 500
 
 
+
 @app.route("/cors-proxy", methods=["POST"])
 def corsproxy_post():
     url = request.args.get("url")