After checking the state and status code we are sure and safe to proceed further. Now we can manipulate the data sent as response from the server.

iii) Accessing the response data:

We have two options to collect the data:

1. xmlHttp.responseText: It is used to access plain text response from the server.
2. xmlHttp.responseXML: It is used to obtain XML formatted data.
In the method above, the response data is collected in the variable str and then it is used to alert the message.

To dynamically determine the response types you can write:

var contentType = xmlHttp.getResponseHeader(“content-type”);

The possible returned content types are ‘text/xml’ or ‘text/plain’ indicating XML or plain text content respectively.