title: Unable to send HttpResponse from Django
body: <p>I am trying to send the JSON Format with added headers in .csv format to a front end for download.
  While sending a HTTP Response I am facing an "is not JSON serializable" error.</p>
  
  <p>My <code>views.py</code> file:</p>
  
  <pre><code>from datetime import datetime
  from django.shortcuts import render
  from django.http import HttpResponse
  import json as simplejson
  import random
  import csv
  
  def DownloadEventLog(request):
      downloadeventlog = "[{\"severity\":\"0\",\"description\":\"USB Connected\",\"date\":\"01/01/2015\",\"time\":\"11:35:20\"},{\"severity\":\"3\",\"description\":\"USB Disconnected\",\"date\":\"01/01/2015\",\"time\":\"10:30:19\"}]";
  
      data = simplejson.loads(downloadeventlog)
      response = HttpResponse(content_type='text/csv')
      response['Content-Disposition'] = 'attachment; filename="eventlog.csv"'
  
      writer = csv.writer(response)
      writer.writerow(data[0].keys())
      for row in data:
          writer.writerow(row.values())
      print response
      return HttpResponse(simplejson.dumps(response), content_type = "application/json")
  </code></pre>
  
  <p>Print response cmd is printing:</p>
  
  <pre><code>Content-Type: text/csv
  Content-Disposition: attachment; filename="eventlog.csv"
  
  date,time,severity,description
  01/01/2015,11:35:20,0,"USB Connected"
  02/02/2015,10:30:19,3,"USB Disconnected"
  </code></pre>
  
  <p>However the last line is throwing an error as follows:</p>
  
  <pre><code>TypeError at /eventlog/downloadeventlog
  &lt;django.http.response.HttpResponse object at 0x9c059ec&gt;is not JSON serializable
  
  Request Method: POST
  Request URL: http://127.0.0.1:8001/eventlog/downloadeventlog
  Django Version: 1.7.1
  Python Version: 2.7.3
  </code></pre>