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Which NSString encoding method will percent escape the ampersand (&) character correctly into %26?
stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding
gets the spaces (%20) and other baddies but ignores ampersands!?!
Ampersands won’t be processed by that method because they’re legal characters in a URL. You should probably pre-process particularly problematic pieces, piecemeal, prior to this call.