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import httpx
from fastapi import FastAPI, Request
from fastapi.responses import StreamingResponse
import uvicorn

# Poe API 的目标主机
POE_API_HOST = "api.poe.com"

app = FastAPI()

# 创建一个可复用的 httpx 异步客户端
client = httpx.AsyncClient(base_url=f"https://{POE_API_HOST}", timeout=30.0)

@app.api_route("/{path:path}", methods=["GET", "POST", "PUT", "DELETE", "OPTIONS", "HEAD", "PATCH"])
asyncdefreverse_proxy(request: Request, path: str):
    """
    一个通用的反向代理，将请求转发到 POE_API_HOST。
    """
    # 构建目标 URL
    target_url = httpx.URL(path=f"/{path}", query=request.url.query.encode("utf-8"))

    # 准备请求头
    headers = {k: v for k, v in request.headers.items() if k.lower() != 'host'}
    headers['host'] = POE_API_HOST # 必须将 Host 头设置为目标主机

    # 准备请求体
    req_content = request.stream()

    # 发送请求到目标服务器
    proxied_request = client.build_request(
        method=request.method,
        url=target_url,
        headers=headers,
        cnotallow=req_content,
    )
    proxied_response = await client.send(proxied_request, stream=True)

    # 将响应流式传回
    return StreamingResponse(
        proxied_response.aiter_bytes(),
        status_code=proxied_response.status_code,
        headers=proxied_response.headers,
        media_type=proxied_response.headers.get("content-type"),
    )

if __name__ == "__main__":
    # 启动uvicorn服务器
    uvicorn.run(
        "poeapi:app",
        host="0.0.0.0",
        port=8090,
        reload=True,
        log_level="info"
    )