Bug 21078 - ModernHttpClient latest one is not working for iOS6.x
Summary: ModernHttpClient latest one is not working for iOS6.x
Alias: None
Product: iOS
Classification: Xamarin
Component: Tools ()
Version: master
Hardware: PC Mac OS
: Normal normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2014-07-03 04:31 UTC by Mustafa Shaik
Modified: 2014-07-03 10:37 UTC (History)
3 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Mustafa Shaik 2014-07-03 04:31:33 UTC
I am consuming latest version of ModernHttpClient ( and its crashing on iOS6.1 emulator. I copied the stack trace too. It clearly states that some issue with NSUrlSession and NSUrlSession is available ios7 and above. Is there any work around for this or any other alternate dll that supports starting from iOS5 and later.

Trace Logs: 

System.ArgumentNullException: Argument cannot be null.
Parameter name: configuration
  at MonoTouch.Foundation.NSUrlSession.FromWeakConfiguration (MonoTouch.Foundation.NSUrlSessionConfiguration configuration, MonoTouch.Foundation.NSObject weakDelegate, MonoTouch.Foundation.NSOperationQueue delegateQueue) [0x00006] in /Developer/MonoTouch/Source/monotouch/src/build/compat/Foundation/NSUrlSession.g.cs:677
  at MonoTouch.Foundation.NSUrlSession.FromConfiguration (MonoTouch.Foundation.NSUrlSessionConfiguration configuration, MonoTouch.Foundation.NSUrlSessionDelegate sessionDelegate, MonoTouch.Foundation.NSOperationQueue delegateQueue) [0x00000] in /Developer/MonoTouch/Source/monotouch/src/build/compat/Foundation/NSUrlSession.g.cs:669
  at ModernHttpClient.NativeMessageHandler..ctor (Boolean throwOnCaptiveNetwork) [0x0001c] in /Users/paul/code/paulcbetts/ModernHttpClient/src/ModernHttpClient/iOS/NSUrlSessionHandler.cs:38
  at ModernHttpClient.NativeMessageHandler..ctor () [0x00000] in /Users/paul/code/paulcbetts/ModernHttpClient/src/ModernHttpClient/iOS/NSUrlSessionHandler.cs:35
  at ....

Comment 1 Sebastien Pouliot 2014-07-03 10:37:20 UTC
NSURLSession is only available in iOS 7.0+. The only workarounds are to

* require iOS 7+ for your application(s); or

* use something else, like:

(a) try the CFNetwork backend of HttpClient that ships with Xamarin.iOS [1];


(b) contact the ModernHttpClient author [2] to see if older versions did not require NSURLSession (I do not recall).

[1] http://tirania.org/monomac//archive/2013/Jun.html
[2] http://blog.paulbetts.org/