POST /v1/messages HTTP/1.1
Accept-Encoding: identity
Content-Length: 96
Host: 174.138.116.231:9999
Content-Type: application/json
Anthropic-Version: 2023-06-01
X-Api-Key: probe
User-Agent: claude-code/1.x
Connection: close

{"model": "claude-sonnet-4-5", "max_tokens": 5, "messages": [{"role": "user", "content": "hi"}]}