Limit the ASGI Falcon handler scope to accept only JSON.

[0x1618]

Hello, as the title says. How do I limit the ASGI Falcon handler scope to accept only JSON from incoming traffic and respond only with JSON?

[CaselIT]

Hi,

You can use a middleware to check if the client accepts json, something like this:

import falcon
from falcon import Request, Response

class ExampleMiddleware:
    async def process_request(self, req: Request, resp: Response) -> None:
        if not req.client_accepts_json:
            raise falcon.HTTPNotAcceptable(
                description="This API only supports responses encoded as JSON."
            )

Regarding replies, you are the one that provides them, so they are in the format you set them.
Errors can be serialized in xml, but there is a flag since 4.0 that prevents it when set to False: https://falcon.readthedocs.io/en/stable/api/app.html#falcon.ResponseOptions.xml_error_serialization

[0x1618]

Thank you so much! I wrote this post because of XML errors that were being sent. Setting xml_error_serialization=False resolved my problem.