kCFErrorDomainCFNetwork error 1 with Safari "user agents"

I am trying to use the different "user agents" to test a web page with Safari in "Developer" mote but I get the above error.   I even get it with the following:

 

 

 

Hello World.

 

 

The different user agents seemed to work with an earlier version of my site but not anymore.  What is broken?

 

Thanks.

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