Q	A
Bug or feature request?	Bug
Which Swagger/OpenAPI version?	2.0
Which Swagger-UI version?	3.9.0
How did you install Swagger-UI?	loading via cdnjs
Which browser & version?	Chrome 63.0.3239.132
Which operating system?	Windows

Expected Behavior

Clicking the spec link will show the spec

Current Behavior

Instead it links to about:blank. Testing the operations and everything else works, the link worked in 3.0.18

The issue can also be reproduced on the petstore,

Possible Solution

The url is sanitized via

which calls
https://github.com/braintree/sanitize-url/blob/master/index.js
but the relative url does not contain ":" so the regex fails and the link becomes "about:blank"

Context

Workaround is to just copy/paste the spec url into the browser address