How to enable CORS in flask

Question

I am trying to make a cross origin request using jquery but it keeps being reject with the message      XMLHttpRequest cannot load http       No  Access-Control-Allow-Origin    header is present on the requested resource  Origin     is therefore   not allowed access    I am using flask  heroku  and jquery   the client code looks like this     document  ready function             submit contact   click function e           e preventDefault              ajax               type   POST               url   http                        data                          name   name   value     name   val                           name   email   value     email   val                            name   phone   value     phone   val                           name   description   value     desc   val                                                 data  name 3 amp email 3 amp phone 3 amp description 3               crossDomain true              success  function msg                    alert msg                                            on the heroku side i am using flask and it is like this  from flask import Flask request from flask ext mandrill import Mandrill try      from flask ext cors import CORS    The typical way to import flask-cors except ImportError        Path hack allows examples to be run without installation      import os     parentdir   os path dirname os path dirname os path abspath   file          os sys path insert 0  parentdir       from flask ext cors import CORS app   Flask   name     app config  MANDRILL API KEY           app config  MANDRILL DEFAULT FROM          app config  QOLD SUPPORT EMAIL         app config  CORS HEADERS      Content-Type   mandrill   Mandrill app  cors   CORS app    app route   email   methods   POST    def hello world        name request form  name       email request form  email       phone request form  phone       description request form  description        mandrill send email          from email email          from name name          to    email   app config  QOLD SUPPORT EMAIL              text  Phone   phone   n n  description            return  200 OK   if   name         main         app run

User · Answer

Here is what worked for me when I deployed to Heroku.

http://flask-cors.readthedocs.org/en/latest/
Install flask-cors by running - pip install -U flask-cors

from flask import Flask
from flask_cors import CORS, cross_origin
app = Flask(__name__)
cors = CORS(app)
app.config['CORS_HEADERS'] = 'Content-Type'

@app.route("/")
@cross_origin()
def helloWorld():
  return "Hello, cross-origin-world!"

How to enable CORS in flask

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