Axios, POST request to Flask

Question

I try to make a POST to a flask server using axios:

var config = { headers: {  
                      \'Content-Type\': \'application/json\',
                        


        

Answer 1

You need to add CORS support to your Flask app. See a related threat here: Flask-CORS not working for POST, but working for GET. A popular CORS extension for Flask can be found here: https://flask-cors.readthedocs.io/en/latest/.

Answer 2

If anyone else is stuck, be sure to check your before and after request methods. My problem was this:

@app.before_request
def oauth_verify(*args, **kwargs):
    """Ensure the oauth authorization header is set"""
    if not _is_oauth_valid():
        return some_custome_error_response("you need oauth!")

So then this would raise an exception on any request, including an OPTIONS method. Of course, the fix is easy:

@app.before_request
def oauth_verify(*args, **kwargs):
    """Ensure the oauth authorization header is set"""
    if request.method in ['OPTIONS', ]:
        return
    if not _is_oauth_valid():
        return some_custome_error_response("you need oauth!")