Test if URL image exists

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New at brightscript.

using this variable:
myimage = “http://192.168.1.100/images/bigimage.jpg”

i just need a way to test if the file exists or not.

something like
result = doesFileExists(myimage)

result can be boolean true/false, or better if the file exists, result holds the URL, otherwise result is null.

Any help? I’m struggling with the docs and cant find any examples. Thanks.