On some browsers, for example:
- Linux Brave Version 1.57.62
- Windows Edge Version 116.0.1938.69
- Windows Firefox Version 117.0
The URL mentioned in section 7.7 fails to load with a Failed to load API definition error that mentions the possibility of a Possible mixed-content issue.
Googling around for a way to solve this error seems to indicate that it can be addressed by setting the Insecure content setting for the site petstore.swagger.io to the value Allow. That being said, this solution did not work in my testing.
I was able to proceed by using either Linux Chrome Version 116.0.5845.179, or Linux Firefox Version 117.0, both of which seem to be defaulting to allow mixed-content.