Don't let libcurl handle Location headers.

Author: danieleggert

Foundation/NSURLSession+libcurl.swift

@@ -975,6 +975,10 @@ extension NSURLSessionTask.EasyHandle {
     func setPassHeadersToDataStream(flag: Bool) {
         try! CFURLSession_easy_setopt_long(rawHandle, CFURLSession_OptionHEADER, flag ? 1 : 0).asError()
     }
+    /// Follow any Location: header that the server sends as part of a HTTP header in a 3xx response
+    func setFollowLocation(flag: Bool) {
+        try! CFURLSession_easy_setopt_long(rawHandle, CFURLSession_OptionFOLLOWLOCATION, flag ? 1 : 0).asError()
+    }
     /// Switch off the progress meter. It will also prevent the CFURLSession_OptionPROGRESSFUNCTION from getting called.
     func setProgressMeterOff(flag: Bool) {
         try! CFURLSession_easy_setopt_long(rawHandle, CFURLSession_OptionNOPROGRESS, flag ? 1 : 0).asError()
@@ -1144,6 +1148,8 @@ private extension NSURLSessionTask.EasyHandle {
             return NSURLErrorNetworkConnectionLost
         case (CFURLSession_EasyCodeSEND_ERROR, ECONNRESET):
             return NSURLErrorNetworkConnectionLost
+        case (CFURLSession_EasyCodeGOT_NOTHING, _):
+            return NSURLErrorBadServerResponse
         default:
             //TODO: Need to map to one of the NSURLError... constants
             NSUnimplemented()

Foundation/NSURLSession.swift

@@ -840,6 +840,9 @@ private extension NSURLSessionTask {
             //
             // The `HTTPBody` and `HTTPBodyStream` methods are missing from `NSURLRequest` ?!?
         }
+        
+        // HTTP Options:
+        easyHandle.setFollowLocation(false)
         easyHandle.setCustomHeaders([]) //TODO: Fix headers
         easyHandle.setDisableContentDecoding()
         easyHandle.setWaitForPipeliningAndMultiplexing(true)