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How to return 400 (Bad Request) on Flask?

Hello Guys, How are you all? Hope You all Are Fine. Today We Are Going To learn about How to return 400 (Bad Request) on Flask in Python. So Here I am Explain to you all the possible Methods here.

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Table of Contents

How to return 400 (Bad Request) on Flask?

  1. How to return 400 (Bad Request) on Flask?

    flask.abort is a wrapper around werkzeug.exceptions.abort which is really just a helper method to make it easier to raise HTTP exceptions. That's fine in most cases, but for restful APIs, I think it may be better to be explicit with return responses.

  2. return 400 (Bad Request) on Flask

    flask.abort is a wrapper around werkzeug.exceptions.abort which is really just a helper method to make it easier to raise HTTP exceptions. That's fine in most cases, but for restful APIs, I think it may be better to be explicit with return responses.

Method 1

You have a variety of options:

The most basic:

@app.route('/')
def index():
    return "Record not found", 400

If you want to access the headers, you can grab the response object:

@app.route('/')
def index():
    resp = make_response("Record not found", 400)
    resp.headers['X-Something'] = 'A value'
    return resp

Or you can make it more explicit, and not just return a number, but return a status code object

from flask_api import status

@app.route('/')
def index():
    return "Record not found", status.HTTP_400_BAD_REQUEST

Further reading:

You can read more about the first two here: About Responses (Flask quickstart)
And the third here: Status codes (Flask API Guide)

Method 2

I like to use the flask.Response class:

from flask import Response


@app.route("/")
def index():
    return Response(
        "The response body goes here",
        status=400,
    )

flask.abort is a wrapper around werkzeug.exceptions.abort which is really just a helper method to make it easier to raise HTTP exceptions. That’s fine in most cases, but for restful APIs, I think it may be better to be explicit with return responses.

Summery

It’s all About this issue. Hope all Methods helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which Method worked for you? Thank You.

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