Use template in custom handler for 404 or 500 pages

[Aju100]

How can I use the Jinja2 template to render my custom template using TemplateResponse like the below code in the following sample code of 404 or 500 exception?

from fastapi import FastAPI
from fastapi.templating import Jinja2Templates
@app.get('/')
async def home(request: Request):
    return templates.TemplateResponse("general_pages/home.html",{"request":request})

In below code, it used HTMLResponse but How I can use for my custom template like flask or django application.

from flask import render_template

@app.errorhandler(404)
def page_not_found(e):
    # note that we set the 404 status explicitly
    return render_template('404.html'), 404

from starlette.applications import Starlette
from starlette.responses import HTMLResponse


HTML_404_PAGE = <h1>Here is 404</h1>
HTML_500_PAGE = <h1>Here is 500</h1>


async def not_found(request, exc):
    return HTMLResponse(content=HTML_404_PAGE, status_code=exc.status_code)

async def server_error(request, exc):
    return HTMLResponse(content=HTML_500_PAGE, status_code=exc.status_code)


exception_handlers = {
    404: not_found,
    500: server_error
}

app = Starlette(routes=routes, exception_handlers=exception_handlers)

Reference:

• https://www.starlette.io/exceptions/
• https://flask.palletsprojects.com/en/1.1.x/patterns/errorpages/

[Hultner]

Take a look at the documentation for overriding the default exception handlers. I think that should be enough to achieve what you're asking about.

[tiangolo]

Thanks for the help here @Hultner ! 👏 🙇

Thanks for reporting back and closing the issue @Aju100 👍

Sorry for the long delay! 🙈 I wanted to personally address each issue/PR and they piled up through time, but now I'm checking each one in order.