code: public static String getServerScheme() {
          String ret = getLatkeProperty("serverScheme");
          if (null == ret) {
              final RequestContext requestContext = REQUEST_CONTEXT.get();
              if (null != requestContext) {
                  ret = requestContext.getRequest().getScheme();
              } else {
                  ret = "http";
              }
          }
  
          return ret;
      }
docs: Gets server scheme.
  
  @return server scheme