How to read response returned by a page?

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ASP

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Hi!

I have a website made from asp classic. it has a form that will send action to a certain website. then the website will send a return.

this is how i send post.

<form name='postURL' action='URL' method='post'>
<input type="text" name="Param1" value= ''/>
<input type="text" name="Param2" value='<'/>
<input type="text" name="Param3" value=''/> </form>

after posting. my site will be redirected to a new URL:
and display something like this:
{"resultCode":"000","resultMsg":"Success","txnToken":"cRmQsu1JV81eacb78f82da"}

my question is how do a get the response without redirecting this a new URL?

appreciate your feedback guys.

Thank you.

What I have tried:

here is my code

<form name='postURL' action='URL' method='post'>
<input type="text" name="Param1" value= ''/>
<input type="text" name="Param2" value='<'/>
<input type="text" name="Param3" value=''/> </form>