Error encoding utf-8 in JSONResponse.render (UnicodeEncodeError)

[MrArlian]

I tried to pass data that is not supported by utf-8 in order to test my code, but I encountered a problem where JSONResponse refuses to display JSON due to a UnicodeEncodeError.

This is related to 'FastAPI,' but I don't think it should be an issue, as they use your library!!
I think this can be fixed by adding errors="ignore" to the encode function in starlette.responses.JSONResponse.render

Traceback (most recent call last):
  File "E:\Python\lib\site-packages\starlette\middleware\exceptions.py", line 68, in __call__
    await self.app(scope, receive, sender)
  File "E:\Python\lib\site-packages\fastapi\middleware\asyncexitstack.py", line 20, in __call__
    raise e
  File "E:\Python\lib\site-packages\fastapi\middleware\asyncexitstack.py", line 17, in __call__
    await self.app(scope, receive, send)
  File "E:\Python\lib\site-packages\starlette\routing.py", line 718, in __call__
    await route.handle(scope, receive, send)
  File "E:\Python\lib\site-packages\starlette\routing.py", line 276, in handle
    await self.app(scope, receive, send)
  File "E:\Python\lib\site-packages\starlette\routing.py", line 66, in app
    response = await func(request)
  File "E:\Python\lib\site-packages\fastapi\routing.py", line 271, in app
    raise RequestValidationError(_normalize_errors(errors), body=body)
fastapi.exceptions.RequestValidationError: [{'type': 'value_error', 'loc': ('body', 'password'), 'msg': 'Value error, The password contains a character that cannot be encoded.', 'input': 'string\ud800', 'ctx': {'error': InvalidPasswordCharacter('The password contains a character that cannot be encoded.')}, 'url': 'https://errors.pydantic.dev/2.4/v/value_error'}]

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "E:\Python\lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 408, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
  File "E:\Python\lib\site-packages\uvicorn\middleware\proxy_headers.py", line 84, in __call__
    return await self.app(scope, receive, send)
  File "E:\Python\lib\site-packages\fastapi\applications.py", line 292, in __call__
    await super().__call__(scope, receive, send)
  File "E:\Python\lib\site-packages\starlette\applications.py", line 122, in __call__
    await self.middleware_stack(scope, receive, send)
  File "E:\Python\lib\site-packages\starlette\middleware\errors.py", line 184, in __call__
    raise exc
  File "E:\Python\lib\site-packages\starlette\middleware\errors.py", line 162, in __call__
    await self.app(scope, receive, _send)
  File "E:\Python\lib\site-packages\starlette\middleware\exceptions.py", line 88, in __call__
    response = await handler(request, exc)
  File "E:\Python\lib\site-packages\fastapi\exception_handlers.py", line 23, in request_validation_exception_handler
    return JSONResponse(
  File "E:\Python\lib\site-packages\starlette\responses.py", line 196, in __init__
    super().__init__(content, status_code, headers, media_type, background)
  File "E:\Python\lib\site-packages\starlette\responses.py", line 55, in __init__
    self.body = self.render(content)
  File "E:\Python\lib\site-packages\starlette\responses.py", line 205, in render
    ).encode("utf-8")
UnicodeEncodeError: 'utf-8' codec can't encode character '\ud800' in position 153: surrogates not allowed

[Kludex]

I need an MRE.

It doesn't look like we have an issue here.