Allow providing extra DEFAULT_TEXT_MIME_TYPES

[georgebv]

Issue: I want to serve binary files as is (not base64 encoded)
Cause: everything not in DEFAULT_TEXT_MIME_TYPES is base64 encoded by default
Proposed solution: allow providing additional mime types; suggested options:

• when declaring the handler Mangum(app, extra_text_mime_types=["image/png"])
• after declaring the handler handler.add_text_mime_types(["image/png"])

This is my current hacky solution to serve png images:

from mangum import Mangum
from mangum.handlers.utils import DEFAULT_TEXT_MIME_TYPES

from app.main import app

# Monkey patch MIME types
DEFAULT_TEXT_MIME_TYPES.extend(
    [
        "image/png",
    ]
)

handler = Mangum(app)

[jordaneremieff]

Hi @georgebv, this is similar to a recent issue report in #270.

One of the solutions proposed was to re-introduce the text_mime_types configuration, if you are able to put forward a PR to do this, then I will review and merge.

[georgebv]

@jordaneremieff sounds good, I'll link it here once I get to it (~this week). Also, FYI, I am using mangum to deploy a full-blown web app on FastAPI to aws lambda.

[jordaneremieff]

Released in 0.16.0.