title: Corona SDK network.request not triggering
body: <p>I'm using the qrscanner plugin in Corona SDK to scan a QR code and perform only 2 functions. First it checks a bool value in the DB and if the value is 0 it should display a message and change it to 1.</p>
  
  <p>The first network call works and updates the test in the app, but the second network call does not return anything. The code if very basic as it's my first lua/corona script.</p>
  
  <pre><code>local json = require( "json" )
  local function handleResponse( event )
      if not event.isError then
  
          local data,pos,msg= json.decode(event.response)
          print( event.response )
  
          if not data then
              native.showAlert('error, no response', 'no response from the server', {'OK'})
          else
              if data.checked_in == "0" then
                  myText.text = "Not checked in yet.\nVehicle Detail:\nReg#\n"..data.registration.."\nMake:\n"..data.make.."\nModel:\n"..data.model.."\n"
                  urx2 = "http://mydomain/index.php/checkin/"..message
                  network.request( urx2, "GET", handleResponse2 )
                  print('Scanned message:', message)
              else
                  myText.text = "WARNING: Vehicle already checked in.\nVehicle Detail:\nReg#\n"..data.registration.."\nMake:\n"..data.make.."\nModel:\n"..data.model.."\n"
              end
          end
      else
          native.showAlert('Darn: this url is broken: '..urx, message, {'OK'})
      end
      return true
  end
  
  local function handleResponse2( event )
      if not event.isError then
  
          local data,pos,msg= json.decode(event.response)
          print( event.response )
  
          if not data then
              native.showAlert('error, no response', {'OK'})
          else
              if data.checked_in == "0" then
                  myText.text = "Still not checked in, try again."
              else
                  myText.text = "Successfully checked in."
              end
              sceneGroup:insert( summary )
              print(data.checked_in)
          end
      end
      return true
  end
  
  local function status_listener(message)
      urx = "http://mydomainindex.php/checkedin/"..message
      network.request( urx, "GET", handleResponse )
  end
  
  local function checkin_listener(message)
      urx = "http://mydomain/index.php/checkin/"..message
      network.request( urx, "GET", handleResponse2 )
      print('Scanned message:', message)
  end
  </code></pre>
  
  <p>So everything work up to this point:</p>
  
  <pre><code>                if data.checked_in == "0" then
                  myText.text = "Not checked in yet.\nVehicle Detail:\nReg#\n"..data.registration.."\nMake:\n"..data.make.."\nModel:\n"..data.model.."\n"
                  urx2 = "http://mydomain/index.php/checkin/"..message
                  network.request( urx2, "GET", handleResponse2 )
                  print('Scanned message:', message)
  </code></pre>
  
  <p>What am I missing?</p>