The raw url is:
/?var1=1&var2=2+2%2f3&var1=3

The url encoded is:
%2f%3fvar1%3d1%26var2%3d2%2b2%252f3%26var1%3d3

The url decoded is:
/?var1=1&var2=2 2/3&var1=3

The query string NameValueCollection is:
var1 - 1,3
var2 - 2 2/3