Django comments flag "cancel" returns incorrect url

[DF]

I've set up django's built in comments in my application and I'm employing the flagging ability. The flagging works fine, but the 'cancel" link that appears on the template returns the following error when clicked:

could not find http

The template/form is as follows:

{% extends "base.html" %}

{% load i18n %}

{% block title %}{% trans "Flag this comment" %}{% endblock %}

{% block content %}

<h3>{% trans "Are you sure you want to flag this comment?" %}</h3>

<br />

 <blockquote>{{ comment|linebreaks }}</blockquote>

 <form action="." method="post">{% csrf_token %}

{% if next %}<div><input type="hidden" name="next" value="{{ next }}" id="next" /></div>{% endif %}

<p class="submit">

<input type="submit" class="btn btn-danger button-left" name="submit" value="{% trans "Flag" %}" /> or <a href="{{ comment.get_absolute_url }}">cancel</a>

</p>

  </form>

 {% endblock %}

Any insight into this would be greatly appreciated.