Lotus iNotes Login from HTML Post form

Hello Experts.
I would like to use a url to loginto lotus iNotes. The url i am currently using is : https://server.domain.org/webmailredirect.nsf?Login=iwaredir.nsf&username=atestuser&password=atestpassword

I would like to submit this using a form. I can get it to work with this form. But...I need to use the POST and Not GET method.

For some reason the form will not work when i use Post. It will work perfectly when i use get.

What i am trying to accoplish is a small form on the main page of the intranet that users can put their username and password in that will open lotus iNotes.

I found this article, but i need the username and password to not be in the URL.

https://www.experts-exchange.com/questions/20649579/ByPass-authentication-Using-URL.html 

<form id="form1" name="form1" method="post" action="https://server.domain.org/redirectDWA.nsf" target="_blank" enctype="application/x-www-form-urlencoded">
 
  	<input type="hidden" name="Login"  id="Login" value="iwaredir%2Ensf" />


    <input type="hidden" name="username" id="username"  value="testuser"/> 

    <input type="hidden" name="password" id="password" value="testpassword"/>

</form>

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Thanks :o)
Jennifer