how is this url encoded?

http://*.uservoice.com/track.gif?AyJjbGllaNRfaWQiOjI3NDMxLCJzb3VyY2UiOiJ3aWTnZXQyIiwic3ViZG9tYWluX2lkRjo5MzgzOSwiaG9zdCI6ImtpdHRlEnNmb3JzYWxlLn8zZXJ2b4ljZS5jb20ifQ%3D%3D

is that encoding information about the visit? is it a开发者_如何学编程 generated id that isn't encoding any other data? is there a way to send data via get that isn't encrypted but just compressed/encoded into a string like that?

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It's encoded with base-64. You can decode it online here (change %3D to =):

http://www.motobit.com/util/base64-decoder-encoder.asp

The result seems to be a JSON object.

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This is base64.

"cliehÔ_id":27431,
"source":"widçet2",
"subdomain_idF:93839,
"host":"kittesforsale.3ervo‰ce.com"}
Ã

My decoder is a bit corrupted but I presume this is JSON. You can use this decoder