405 Method not allowed when uploading file
<p>I have a class-based view with a defined <code>post</code> method, which is the end-point of a file upload.</p>

<p>The request is made using the <code>ng-file-upload</code> module.</p>

<p>When executing the upload request, I receive a <code>405 Method not allowed</code> error.</p>

<p>If I try to make a POST to that same URL with the same parameters (except for the file), it's working fine.</p>

<p>I can see in Firebug that the Response Headers are different:</p>

<ul>
<li>When sending the request via POST, the response's allowed method are POST and OPTIONS</li>
<li>When sending via upload, they are GET, HEAD and OPTIONS</li>
</ul>

<p>What could be causing this?</p>

<p>[edit]
As requested, here is the (simplified) code of the view handling method:</p>

<pre><code>def order_data(order, request):
    """
    Return a serialized order with added permission information
    """
    data = OrderSerializer(order).data

    # Add a few custom fields on the data dict

    return data

class SaveOrder(APIView):

    def post(self, request):
        data = request.data.get('order')

        if data.get('id', None) is not None:
            if not request.user.has_perm('orders.modify_order'):
                return HttpResponseForbidden()
            else:
                order = Order.objects.get(id=data['id'])
        else:
            if not request.user.has_perm('orders.create_order'):
                return HttpResponseForbidden()
            else:
                order = Order()

        # Fill in order using the fields in data

         order.save()

        return JsonResponse(order_data(order, request))
</code></pre>

<p>[edit2] Actually the behaviour is not exactly what I've described earlier:</p>

<ul>
<li>With <code>upload</code> to url <code>/order/save-order</code> I get an error saying that I need a trailing slash</li>
<li>With <code>upload</code> to url <code>/order/save-order/</code> I get a 405</li>
<li>With <code>post</code> to url <code>/order/save-order</code> it's working fine (original code)</li>
<li>With <code>post</code> to url <code>/order/save-order/</code> I get a 404</li>
</ul>