Hi Jeff,
I think you are over-thinking this a bit
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>> Maybe my question is too simple.
>> I'm asking what _I_ should on my NetTalk server do so that it's possible that THEY can do the simple GET to retrieve the image. :-)
The short answer is "nothing for you to do - it already does that".
The long answer adds the sentence ".. as long as the image is in the web folder,or sub folder.".
In other words, files in the web (or sub) folders can be served if the user just enters the name.
There's nothing for you do to - the server is a server, and this is what it serves.
There's no "API" involved here - serving files is what the web server _does_.
I think you've gone down a very (very) common thought problem though. Typically we start with serving static files, then graduate to Web API's then Web Apps (then Mobile apps). Along the way we can start overthinking a situation - especially (I've noticed) serving static files.
_Of course_ it can then more complicated (like serving from a BLOB field etc), but at it's root static files in the web folder are just "served".
cheers
Bruce