curl --request POST "https://gptproto.com/v1/responses" \
  --header "Authorization: Bearer $GPTPROTO_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
    "model": "gpt-5.5-pro",
    "input": [
      {
        "role": "user",
        "content": [
          {
            "type": "input_text",
            "text": "這個檔案裡有什麼？"
          },
          {
            "type": "input_file",
            "file_url": "https://tos.gptproto.com/resource/gptproto.pdf"
          }
        ]
      }
    ]
  }'