调用api报错

[neicedai]

(fog) PS C:\Users\NEO\fogsight> python start_fogsight.py
--- 后端启动中，请访问 http://127.0.0.1:8000 ---
--- 在默认浏览器中打开前端: http://127.0.0.1:8000 ---
INFO: Started server process [40880]
INFO: Waiting for application startup.
INFO: Application startup complete.
INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO: 127.0.0.1:54486 - "GET / HTTP/1.1" 200 OK
INFO: 127.0.0.1:54486 - "GET /static/style.css?v=20250922161259 HTTP/1.1" 200 OK
INFO: 127.0.0.1:54486 - "GET /static/script.js?v=20250922161259 HTTP/1.1" 200 OK
INFO: 127.0.0.1:54486 - "GET /static/favicon.png?v=20250922161259 HTTP/1.1" 200 OK
INFO: 127.0.0.1:61197 - "GET / HTTP/1.1" 200 OK
INFO: 127.0.0.1:61197 - "GET /static/style.css?v=20250922161310 HTTP/1.1" 200 OK
INFO: 127.0.0.1:50709 - "GET /static/script.js?v=20250922161310 HTTP/1.1" 200 OK
INFO: 127.0.0.1:50709 - "GET /static/favicon.png?v=20250922161310 HTTP/1.1" 200 OK
INFO: 127.0.0.1:50709 - "POST /generate HTTP/1.1" 200 OK
INFO:fogsight:Starting LLM stream for topic: 冒泡排序
INFO:google_genai.models:AFC is enabled with max remote calls: 10.
INFO:httpx:HTTP Request: POST https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-pro:generateContent "HTTP/1.1 503 Service Unavailable"