"Failed to execute 'postMessage' on 'DOMWindow'" error logged when initializing App Bridge

Shopify Partner
11 0 0

Hi there,


We're currently in the process of migrating to App Bridge and all is going well except for one minor glitch. I'm following the guide here https://shopify.dev/apps/tools/app-bridge/getting-started#authenticate-with-oauth


I break out of the iframe to initiate the OAuth flow. When the OAuth flow is complete, the user lands at our embeddable app (https://shopify.dev.nos.to/hub/shopify/shopify-44907954330). At this stage, I render HTML that creates the App Bridge app with the snippet below:

<script src="https://unpkg.com/@shopify/app-bridge@2"></script>
<script type="application/javascript">
var AppBridge = window['app-bridge'];
var app = AppBridge.createApp({
apiKey: '${shopifyClientId}',
host: '${shopifyHost}' // host parameter mentioned here https://shopify.dev/apps/tools/app-bridge/retrieve-the-host

 The app correctly redirects back to the Shopify admin with our app correctly embedded in the iframe. The following error gets logged 3 times at this stage however. It doesn't appear to impact any functionality, so I'm wondering can this be ignored or do I need to address it?


Failed to execute 'postMessage' on 'DOMWindow': The target origin provided ('https://gary-nosto-local.myshopify.com') does not match the recipient window's origin ('https://shopify.dev.nos.to')
Many thanks,
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