<div id="add_list" style="display:none">
<h3 class="">Class name</h3>
<form method="POST" id="form_id" enctype="multipart/form-data" name="post_form">
    <input type="hidden" name="type" value="liste">
    <div class="table-responsive">
        <table class="table">
            <tr>
                <td><label for="a">Label a</label></td>
                <td><input type="text" id="a" name="a"></td>
            </tr>
        </table>
    </div>
    <input type="submit" value="Submit">
</form>
</div>

This is the form in question. It is being run inside a Flask app.

On submit, the terminal shows, with “url” placeholder for the actual & intended url:

127.0.0.1 - - [<Date>] "GET /url?type=liste&a=asdf HTTP/1.1" 200 - 

I tried to fill the form on the HTML page, and expected a

127.0.0.1 - - [<Date>] "POST /url?type=liste&a=asdf HTTP/1.1" 200 - 

to show up

this did not happen