code: @Nonnull
    public FineUploaderBasic setParams (@Nullable final Map <String, String> aParams)
    {
      m_aRequestParams.setAll (aParams);
      return this;
    }
docs: These parameters are sent with the request to the endpoint specified in the
  action option.
  
  @param aParams
  New parameters to be set.
  @return this