public HttpBuilder param(String name, String value) {
        return param(name, value, true);
    }
public HttpBuilder param(String name, String value) {
        return param(name, value, true);
    }
public HttpBuilder param ( String name , String value ) { return param ( name , value , true ) ; }
增加参数，默认使用urlEncoding
@param name
@param value
@return
增加参数，默认使用urlEncoding