When integrating the Nylas Hosted Authentication page into an IFrame within your application, you may encounter a 403 error originating from the provider page. This issue generally arises when the providers have
X-Frame-Options set to
deny. This article aims to explain the reasons behind this occurrence and provides an effective workaround.
The root of the issue is the
X-Frame-OptionsHTTP response header, which is often set to
denyby many providers. This setting effectively prevents the hosted authentication flow from being embedded in an Iframe within your application.
A typical error message might look like this:
Refused to display '<https://accounts.google.com/>' in a frame because it set 'X-Frame-Options' to 'deny'.
Given that the
X-Frame-Optionsis controlled by the provider and not something that Nylas can manipulate, the recommended workaround would be to utilize a popup window instead of an iframe. This alternative approach allows the hosted authentication flow to take place without restrictions imposed by the