Django ajax HTTP 500 when trying to access request.GET

Hi all

I am trying to write a simple ajax that tries to know whether the username already exist before registering.

Whenever I try to access the request.GET in my view function, a HTTP 500 error is raised, if the view function doesn't access it and only use hard coded values-for test- it works.

Any help ?

My code is :

jquery:

function checkUserNameUnique()

{

$.ajax({url:"/ajax/",

data:{username:$("input.username").val()},

success: function(result){

$("span#usernameMessage").text(result);

}

}

);

}

view:

def ajax(request):

    username=request.GET["username"]

    msg=""

    try:

        user=User.objects.get(username=username)

        msg="username is okay"

    except User.DoesNotExist:

        msg="username already exists"

    return HttpResponse(msg);

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