Convert XML Response to HTTP response

Questions
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1

A get request to this API is returning me a XML response
http://api.wolframalpha.com/v2/query?input=pi&appid=xxxx where xxxx is my appId.

Response.png
Response.png1891×895 82.9 KB

How to get a proper visually understandable format without XML tags.

2

Extract all of the <plaintext> elements from the response.