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Example of adding CORS headers Flask

An example of adding CORS headers to a Flask app without using Flask-CORS. from flask import Flask, request, jsonify, make_response from werkzeug.datastructures import Headers app = Flask(__name__) @app.route('/', methods=['OPTIONS', 'GET', 'POST']) def index(): # output all request headers to terminal print(request.headers) if request.method == 'POST': # handle json post data here... print(request.get_json()) headers = Headers() headers.add('Access-Control-Allow-Origin', '*') headers.add('Access-Control-Allow-Methods', 'OPTIONS', 'GET', 'POST') headers.add('Access-Control-Allow-Headers', 'Content-Type') headers.add('Access-Control-Max-Age', '300') resp = make_response( jsonify( {'msg':'nailed it! Read more...