title: Flask App deployed on Heroku returns error on post requests
body: <p>I deployed my Flask App on Heroku, I noticed that once deployed post request in the API don't work anymore and the app just responds with status code 400 and <strong>&quot;message&quot;: &quot;The browser (or proxy) sent a request that this server could not understand.&quot;</strong>. Get requests work normally but post don't. Also I am quite confused because if I run the app on localhost everything works as expected but not once deployed. Anyone knows how to solve?</p>
  <p>To parse request argument I use args = ParseArgs.parse_args() from flask_restful and I retrive the value with:</p>
  <p>args = ParseArgs.parse_args()</p>
  <p>mode = args['Mode']
  value = args['Value']</p>
  <p>I tried to look up on google and I saw that it might be the Content-Type header with value application/json, I removed it but the problem still persists.</p>