<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def action(context, request, action=None, resource=None, uid=None):
 """Various HTTP POST actions """


    # allow to set the method via the header
    if action is None:
        action = request.get_header("HTTP_X_HTTP_METHOD_OVERRIDE", "CREATE").lower()

    # Fetch and call the action function of the API
    func_name = "{}_items".format(action)
    action_func = getattr(api, func_name, None)
    if action_func is None:
        api.fail(500, "API has no member named '{}'".format(func_name))

    portal_type = api.resource_to_portal_type(resource)
    items = action_func(portal_type=portal_type, uid=uid)

    return {
        "count": len(items),
        "items": items,
        "url": api.url_for("senaite.jsonapi.v1.action", action=action),
    }