title: Access-Control-Allow-Origin missing in response from request to MailChimp API URL
body: <p>I have Flask website and a simple form for MailChimp newsletter subscription. I am processing form with AJAX.</p>
  
  <p>In order to do that I need to enable Access-Control-Allow-Origin so I am using Flask-CORS, but I keep getting same error: </p>
  
  <p><strong>Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at <a href="https://us16.api.mailchimp.com/3.0/lists/list-ID/members/" rel="nofollow noreferrer">https://us16.api.mailchimp.com/3.0/lists/list-ID/members/</a>. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing)</strong>.</p>
  
  <p>This is chunk of Python code responsible for that:</p>
  
  <pre><code>from flask import Flask, render_template, request
  from flask_cors import CORS
  
  app = Flask(__name__)
  CORS(app, resources={r"/*": {"origins": "*"}}, send_wildcard=True)
  </code></pre>