Example of an Asynchronous Mutator Transaction with nowait=true
---------------------------------------------------------------

Request:

::

    POST http://172.29.232.238/api/data/Countries/
     ?hierarchy=[hierarchy]
     &nowait=true
    Payload of the request:

    {'country_name': 'Callback Created Example Country Name',
     'request_meta': {'callback_password': 'password',
                      'callback_url': 'http://localhost:9365',
                      'callback_username': 'username',
                      'external_id': '3x4mpl3-3xt3rn4l-7d',
                      'external_reference': 'External Ref'}}


Synchronous response:

::

    {
    href: "/api/tool/Transaction/e6ac7c1e-c63a-11e3-9af5-08002791605b"
    success: true
    transaction_id: "e6ac7c1e-c63a-11e3-9af5-08002791605b"
    }
    HTTP 202 ACCEPTED


Asynchronous transaction status callback 
(console output of the simple http service provided in the separate example section):

::

    POST - 2014-04-17 16:16:43.737509

        
    Headers:

    {'accept-encoding': 'identity',
     'authorization': 'Basic dXNlcm5hbWU6cGFzc3dvcmQ=',
     'content-length': '275',
     'content-type': 'application/json',
     'host': 'localhost:8080'}


    Raw Callback Body:

    '{"status": "Fail", "transaction": 
    {"href": 
       "http://django.testserver/api/tool/Transaction/
        34866060-fd47-11e3-88dd-080027880ca6/", 
     "id": "34866060-fd47-11e3-88dd-080027880ca6"}, 
     "resource": {"hierarchy": "1c0efge2c0deab10da595101", 
                  "model_type": "data/Countries", 
                  "pkid": "53ac3d41c9527062809c0021"}, 
                  "external_reference": "External Ref", 
                  "external_id": "3x4mpl3-3xt3rn4l-7d"}'

    Pretty Callback Body:

    {u'external_id': u'3x4mpl3-3xt3rn4l-7d',
     u'external_reference': u'External Ref',
     u'resource': {u'hierarchy': u'1c0efge2c0deab10da595101',
                   u'model_type': u'data/Countries',
                   u'pkid': u'53ac3d41c9527062809c0021'},
     u'status': u'Fail',
     u'transaction': {u'href': 
       u'http://django.testserver/api/tool/Transaction/
        34866060-fd47-11e3-88dd-080027880ca6/',
                      u'id': u'34866060-fd47-11e3-88dd-080027880ca6'}}

    localhost - - [17/Apr/2014 16:16:43] "POST / HTTP/1.1" 200 –


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