code: @Nonnull
    public final APIDescriptor addRequiredParams (@Nullable final String... aParamNames)
    {
      if (aParamNames != null)
        for (final String sParamName : aParamNames)
          addRequiredParam (sParamName);
      return this;
    }
docs: Add one or more required request parameters. If one of these request
  parameters are not present, invocation will not be possible.
  
  @param aParamNames
  The names of the required HTTP parameters. May be <code>null</code>
  or empty.
  @return this for chaining
  @see #addRequiredParam(String)