Fix ip blocker 2nd try (#1796)

* fix ipblock v2

fix ipblock 2nd try

* remove sleep inside ip block

dont ignore other exceptions

typo

* remove asyncio

* Update lnbits/middleware.py

---------

Co-authored-by: callebtc <93376500+callebtc@users.noreply.github.com>

lnbits/middleware.py

@@ -2,7 +2,7 @@ from http import HTTPStatus
 from typing import Any, List, Tuple, Union
 from urllib.parse import parse_qs
 
-from fastapi import FastAPI, Request
+from fastapi import FastAPI, Request, Response
 from fastapi.responses import HTMLResponse, JSONResponse
 from slowapi import _rate_limit_exceeded_handler
 from slowapi.errors import RateLimitExceeded
@@ -218,6 +218,14 @@ def add_ip_block_middleware(app: FastAPI):
                 status_code=403,  # Forbidden
                 content={"detail": "IP is blocked"},
             )
+        # this try: except: block is not needed on latest FastAPI (await call_next(request) is enough)
+        # https://stackoverflow.com/questions/71222144/runtimeerror-no-response-returned-in-fastapi-when-refresh-request
+        # TODO: remove after https://github.com/lnbits/lnbits/pull/1609 is merged
+        try:
             return await call_next(request)
+        except RuntimeError as exc:
+            if str(exc) == "No response returned." and await request.is_disconnected():
+                return Response(status_code=HTTPStatus.NO_CONTENT)
+            raise  # bubble up different exceptions
 
     app.middleware("http")(block_allow_ip_middleware)