curl --request POST "https://gptproto.com/v1/messages" \
  --header "Authorization: Bearer $GPTPROTO_API_KEY" \
  --header "Content-Type: application/json" \
  --header "anthropic-version: 2023-06-01" \
  --data '{
    "model": "claude-haiku-4-5-20251001",
    "max_tokens": 1024,
    "messages": [
      {
        "role": "user",
        "content": [
          {
            "type": "text",
            "text": "請分析這份 PDF 文件並提供其內容摘要"
          },
          {
            "type": "document",
            "source": {
              "type": "url",
              "url": "https://tos.gptproto.com/resource/gptproto.pdf"
            }
          }
        ]
      }
    ]
  }'