Post links cannot be opened from Gmail Android app

[daniel-lerch]

Steps to reproduce

1. Open a blog post email in Gmail on Android
2. Click on the Read more button

Actual behavior

A custom tab opens and loads the admin login screen.

Expected behavior

A custom tab opens gets authenticated and shows the blog post.

Additional context

After analyzing traffic with tcpdump it looks like Android custom tabs ignore Set-Cookie headers and send the package id from the app they were launched from as Referrer. This problems appears both in Chrome and Firefox and might be a conceptual incompatibility with TravelBlog's architecture.