Pub is not feeling well

Fatal package site error.

Please open an issue: https://github.com/dart-lang/pub-dev/issues/new

Add these details to help us fix the issue:

Requested URL: https://web.pub-dev.net/packages?q=topic%3Aurl-preview+platform%3Awindows
Request ID: 9abc337dc09a42b52f7a5902fe135f37