Problem:

 - content length mismatched(ERR_CONTENT_LENGTH_MISMATCH)

 - response string truncated (cut off)


If you are using flask with gevent monkey patch all and you got such a problem above, 

than you should use gevent wsgi instead of flask app.run


For example..

from gevent import monkey

monkey.patch_all()

from flask import Flask

from gevent import wsgi


app = Flask(__name__)


@app.route('/')

def index():

  return 'Hello World'


server = wsgi.WSGIServer(('127.0.0.1', 5000), app)

server.serve_forever()

reason:

flask is not for aysnc future model, so if you want to use asynchronous for http or any socket use, than you should use gevent wsgi

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