Error page should only apply to ui.page endpoints

[ghbm-itk]

First Check

• I added a very descriptive title here.
• This is not a Q&A. I am sure something is wrong with NiceGUI or its documentation.
• I used the GitHub search to find a similar issue and came up empty.

Example Code

# File1.py
from nicegui import app, ui

@ui.page("/")
def gui():
    ui.label("Hello!")

@app.get("/api")
def api():
    return {"response": "hello from api"}

@app.get("/api_error")
def api():
    return {"response": 1/0}

ui.run()

# File2.py
import requests

result = requests.get("http://127.0.0.1:8080/api_error")
print(result)
print(result.text)

Description

I think the default error page should only apply to ui.page endpoints and not endpoints defined by app.get etc.

It creates a very ugly error response for api users, when they receive the error page as html when not viewed in a browser.
Instead api endpoints should be handled by fastapi's normal error handling.

NiceGUI Version

3.11

Python Version

3.11

Browser

Edge

Operating System

Windows

Additional Context

No response

[evnchn]

3 minutes, PR incoming