Magnum text/html response instead of json response. How to test magnum locally? #321

armujahid · 2024-04-17T17:08:20Z

armujahid
Apr 17, 2024

This is how my fastapi is configured and I can get json validation errors locally.

@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request: Request, exc: RequestValidationError):
    return JSONResponse(
        status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
        content=jsonable_encoder({"detail": exc.errors(), "body": exc.body}),
    )



lambda_handler = Mangum(app, lifespan="on")


if __name__ == '__main__':
    import uvicorn
    import argparse

    argparser = argparse.ArgumentParser(description='For port')
    argparser.add_argument('--port',
                           action='store',
                           type=int,
                           required=False)
    args = argparser.parse_args()
    port = args.port if args.port else 3100

    uvicorn.run("serve:app", host="0.0.0.0", port=port, reload=False,
                log_level="debug", workers=1, limit_concurrency=10)

But after deployment on AWS lambda I get this HTML response in case of any validation error from the AWS API gateway. Note that success 200 responses are being returned without any issue.

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>422 Unknown Reason</title>
</head><body>
<h1>Unknown Reason</h1>
<p>The server understands the media type of the
request entity, but was unable to process the
contained instructions.</p>
</body></html>

Any idea how can I test magnum locally instead of running uvicorn that behaves differently ? Probably I will have to pass event via cli but I couldn't find local testing instructions in docs.

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Magnum text/html response instead of json response. How to test magnum locally? #321

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Magnum text/html response instead of json response. How to test magnum locally? #321

armujahid Apr 17, 2024

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armujahid
Apr 17, 2024