question: public void addParameter ( final String paramName , final String paramValue ) throws IllegalArgumentException { LOG . trace ( "enter PostMethod.addParameter(String, String)" ) ; if ( ( paramName == null ) || ( paramValue == null ) ) { throw new IllegalArgumentException ( "Arguments to addParameter(String, String) cannot be null" ) ; } super . clearRequestBody ( ) ; params . add ( new NameValuePair ( paramName , paramValue ) ) ; }
target:  Adds a new parameter to be used in the POST request body.