How to send request without urlencode?

[风]

I want to send the request with the query without urlencode. For example:


I want to request the url:  http://xx.com/?a=<p>b</p>
I do want to urlencode the char: < > /
But when i use HttpClient, it will make a request to : 
http://xx.com/?a=%3cp%3eb%3c%2fp%3e‍


How can i send a request without urlencode? thanks very much!!