api sandbox proxy failover

[MIchaelMainer]

Is your feature request related to a problem? Please describe.
In the case of API sandbox proxy failure, we should have a failover scenario to gracefully handle this scenario.

Describe the solution you'd like
A failover web app

Describe alternatives you've considered
instructions to signed in (use the authenticated) experience, or even dummy response
AB#7528

[adhiambovivian]

@thewahome this PR #955 covers this work?

[thewahome]

No...

[thewahome]

We should close this since our confidence in the proxy improved greatly since the creation of the issue. The issue should be reopened if this changes