Web view shows the connection is blocked

I imported a working Django web app into repl.it. It does work in the browser. But in the repl.it web view, it crashes. I've tried four browsers. The ones with the most useful messages were Opera and Firefox.

The Opera message:

1944af39-b599-40cf-a6ba-c1a9f3897dcc.id.replitusercontent.com is blocked
1944af39-b599-40cf-a6ba-c1a9f3897dcc.id.replitusercontent.com refused to connect.

The Firefox message:

Firefox Can’t Open This Page
To protect your security, 1944af39-b599-40cf-a6ba-c1a9f3897dcc.id.replitusercontent.com will not allow Firefox to display the page if another site has embedded it. To see this page, you need to open it in a new window.
Learn more…
Report errors like this to help Mozilla identify and block malicious sites

Firefox "learn more" link:


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