open-webui/backend/main.py

from fastapi import FastAPI, Request
from fastapi.staticfiles import StaticFiles
from fastapi import HTTPException
from fastapi.middleware.wsgi import WSGIMiddleware
from fastapi.middleware.cors import CORSMiddleware
from starlette.exceptions import HTTPException as StarletteHTTPException

from apps.ollama.main import app as ollama_app
from apps.web.main import app as webui_app

import time


class SPAStaticFiles(StaticFiles):

    async def get_response(self, path: str, scope):
        try:
            return await super().get_response(path, scope)
        except (HTTPException, StarletteHTTPException) as ex:
            if ex.status_code == 404:
                return await super().get_response("index.html", scope)
            else:
                raise ex


app = FastAPI()

origins = ["*"]

app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


@app.middleware("http")
async def check_url(request: Request, call_next):
    start_time = int(time.time())
    response = await call_next(request)
    process_time = int(time.time()) - start_time
    response.headers["X-Process-Time"] = str(process_time)

    return response


app.mount("/api/v1", webui_app)
app.mount("/ollama/api", WSGIMiddleware(ollama_app))
app.mount("/",
          SPAStaticFiles(directory="../build", html=True),
          name="spa-static-files")