Sceenshot

Add this HTML to your layout

<div id="web2py">
        <h1>Web2py Environment</h1>
        <div id="w2p_environ">
            <div id="w2p_request">
                <h2>Request</h2>
                <div class="data">
                    {{=BEAUTIFY(request)}}
                </div>
            </div>

            <div id="w2p_response">
                <h2>Response</h2>
                <div class="data">
                    {{=BEAUTIFY(response)}}
                </div>
            </div>

            <div id="w2p_session">
                <h2>Session</h2>
                <div class="data">
                    {{=BEAUTIFY(session)}}
                </div>
            </div>
        </div>
    </div>

Add this CSS

Do alter the CSS to fit your website, so it can be useful and not in the way.

#web2py {
    position: absolute;
    top: 5px;
    left: 5px;
    height: 5%;
    width: 25%;
    background-color: #111111;
    color: white;
    overflow: auto;
}

#web2py h1 {
    margin: 0;
    padding: 0;
}

#web2py #w2p_environ {
    position: absolute;
    top: 50px;
    left: 5px;
    height: 100%;
    width: 100%;
    background-color: #111111;
    color: white;
}

#web2py .data {
    display: none;
    overflow: auto;
    position: relative;
    height: 600px;
    width: 100%;
}

Add this Javascript

            web2py_height = "5"
            jQuery("#web2py #w2p_environ").hide();
            jQuery("#web2py .data").hide();
            jQuery("#web2py h2").bind("click", function() {
                jQuery("#web2py .data").slideUp();
                jQuery(this).next().slideDown();
            });
            jQuery("#web2py h1").bind("click", function() {
                if (web2py_height == "100"){
                    web2py_height = "5"
                }else{
                    web2py_height = "100"
                }
                jQuery("#web2py").css({
                    "height": web2py_height + "%",
                });
                jQuery("#web2py #w2p_environ").slideToggle();
            });