loadrunner post提交json格式

Action()
{

　　//web_reg_save_param ("S_respond","LB=","RB=",LAST);

　　//web_reg_save_param("saveTestCode","LB=saveTestCode":"","RB="",LAST);
　　web_add_header("Content-Type","application/json;charset=UTF-8");

　　lr_start_transaction("saveTestCode");

　　web_custom_request("saveTestCode",
　　"URL=http://127.0.0.1:88/saveTestCode",
　　"Method=POST",
　　"TargetFrame=",
　　"Resource=0",

　　"RecContentType=application/json",
　　"Referer=",
　　//"Snapshot=t3.inf",
　　"Mode=HTTP",
　　//"EncType=application/json;charset=UTF-8",
　　"Body={"userName":"{userName}","content":"{content}"}",
　　LAST);

　　lr_end_transaction("saveTestCode", LR_AUTO);

　　//打印返回信息
　　//lr_convert_string_encoding ( lr_eval_string ("{S_respond}"),LR_ENC_UTF8 ,NULL,"respond");

　　//打印转码后的响应报文
　　//lr_output_message ( " listGames :%s",lr_eval_string ("{respond}"));

　　return 0;
}