main.py

from fastapi import FastAPI, Request, Header, HTTPException
import httpx

app = FastAPI()

# Replace with your actual backend API key and base URL
API_KEY = "sk-qO9N6kQEEULMWtF4YGVlTTSjIPllEm1h1wfEBzSmnSbxiXwe"
BASE_URL = "https://fast.typegpt.net"

# Custom public header
PUBLIC_API_KEY = "TypeGPT-Free4ALL"

@app.api_route("/{path:path}", methods=["GET", "POST"])
async def proxy(request: Request, path: str, x_api_key: str = Header(None)):
    if x_api_key != PUBLIC_API_KEY:
        raise HTTPException(status_code=401, detail="Invalid API key")

    # Reconstruct full URL to target
    target_url = f"{BASE_URL}/{path}"

    # Prepare headers and body
    headers = dict(request.headers)
    headers["Authorization"] = f"Bearer {API_KEY}"
    headers.pop("host", None)

    body = await request.body()

    async with httpx.AsyncClient() as client:
        response = await client.request(
            request.method,
            target_url,
            content=body,
            headers=headers
        )

    return response.json()