Making the _next option work in Formspree - html

Question

I'm working on a contact form for a static website at www.peek.solutions. The contact form works, in that I'm (after confirmation of my e-mail address) able to receive e-mails at the given address. Here is the code used:
<form id="contactform" action="//formspree.io/kurt.peek#gmail.com" method="POST">
<div class="col-sm-7 slideanim">
<div class="row">
<div class="col-sm-6 form-group">
<input class="form-control" id="name" name="name" placeholder="Name" type="text" required>
</div>
<div class="col-sm-6 form-group">
<input class="form-control" id="email" name="_replyto" placeholder="Email" type="email" required>
</div>
</div>
<textarea class="form-control" id="comments" name="message" placeholder="Message" rows="5"></textarea><br>
<div class="row">
<div class="col-sm-12 form-group">
<button class="btn btn-default pull-right" type="submit">Send</button>
</div>
</div>
</div>
<input type="hidden" name="_next" value="//peek.solutions/confirmation.html" />
<input type="text" name="_gotcha" style="display:none" />
</form>
The problem is that when I submit the form by pressing the "Submit" button, I'm redirected to Formspree's default confirmation page:
However, through the line
<input type="hidden" name="_next" value="//peek.solutions/confirmation.html" />
I was trying to make this confirmation page default to www.peek.solutions/confirmation.html. As far as I can tell, this line follows the documentation at https://formspree.io/. Can anyone tell why this is not working?

Answer 1

Updating your URLs to include http: will fix the issue. so for the _next value it should be http://peek.solutions/confirmation.html,
To prevent exposing your email, and using the now legacy method of using your email in forms, you can sign up for a free Formspree account and generate a custom endpoint. More info on legacy forms can be found here.