app.py

from flask import Flask

from starlette.requests import Request
from starlette.responses import StreamingResponse
from starlette.background import BackgroundTask

import httpx

client = httpx.AsyncClient(base_url="http://127.0.0.1:8080/")

async def _reverse_proxy(request: Request):
    url = httpx.URL(path=request.url.path,
                    query=request.url.query.encode("utf-8"))
    rp_req = client.build_request(request.method, url,
                                  headers=request.headers.raw,
                                  content=await request.body())
    rp_resp = await client.send(rp_req, stream=True)
    return StreamingResponse(
        rp_resp.aiter_raw(),
        status_code=rp_resp.status_code,
        headers=rp_resp.headers,
        background=BackgroundTask(rp_resp.aclose),
    )

app = Flask(__name__)

app.add_route("/netron", _reverse_proxy, methods=["GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS", "HEAD"])

@app.get("/")
def base():
    return "<p>Netron is running</p>"