I wish to send and receive binary data to a server via POST. Somehow I need to send two integers (8 bytes), the server then returns binary records which I need to capture. I have been looking into NSData, the documentation appears to suggest it can receive binary data from a URL with the method "dataWithContentsOfURL" ... But the only method I see for sending is "writeToURL:atomically:" but the documentation then says "at present only file:// URLs are supported". Am I barking up the wrong tree with NSData?