I've tried to send Sh requests to HSS via xhttp -> diameter_request and found that after successful call I've always got empty $diameter_response.

After reading code of ims_diameter_server module I made following patch to finally get responses:

--- a/src/modules/ims_diameter_server/avp_helper.c
+++ b/src/modules/ims_diameter_server/avp_helper.c
 int pv_get_response(struct sip_msg *msg, pv_param_t *param, pv_value_t *res) {
-       if ((msg->id != current_msg_id_repl) || (responsejson.len < 0)) {
+       if (responsejson.len < 0) {
        return pv_get_strval(msg, param, res, &responsejson);

but then I thought that there should be workaround for unpatched version, so here's little hack to set empty $diameter_response before calling diameter_request function:

#
# Processing HTTP request, it should be POST,
#   with URI: http://host:port/lcs/diameter-peer-name/diameter-app-id/function-code
#
event_route[xhttp:request] {
    xlog("Recieved HTTP request with request $hu\n");

    # make diameter_request function happy -- initialize $diameter_response ;) 
    # without setting $diameter_response first - there's no way to get back response_data
    $diameter_response = '';  
    xlog('trying to call: "diameter_request($(hu{s.select,2,/})", $(hu{s.select,3,/}), $(hu{s.select,4,/}), rb);\n');
    diameter_request($(hu{s.select,2,/}), $(hu{s.select,3,/}), $(hu{s.select,4,/}), $rb);

    xlog("Received Diameter response:\n");
#    xlog("$diameter_response \n");

    xhttp_reply("200", "OK", "application/json", "$diameter_response");
}

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