json - Can't read a String from URL using NSData -

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i'm using nsdata(contentsofurl) constructor load data url (server returns json in .txt file). date loads fine, can't create nsstring(date:) out of it. can save data using nsfilemanager.createfileatpath() , it's correct, nsstring created out of data nil, can't create json using swiftyjson.

if execute same query in browser download filename.txt.js.

web-sniffer shows header: "content-disposition: attachment; filename="f.txt"".

try 

let str = nsstring(data: data, encoding: uint)

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