How to retrieve values from tera template by rocket framework?

Question

I need to get values from input form of tera template to rocket code. How can I do that? Here is the template:

{% extends "base" %}

{% block content %}
    <h3>Task:</h3>
    <ul>
        <p>{{task}}</p>
        <input type="text" name="answer">
    </ul>

    <p>Return to main menu <a href="/home">Home</a></p>
{% endblock content %}

I need somehow retrieve the value from the field. If there is a way to receive it by pressing "Enter" that would be even nicer. Thank you for your attention.

I know what to do on the rocket end, but I don't know how to send data from tera templates.

Also, if somebody can say how to do it by pressing "Enter" for example, that would be really great.