每次用salmap测试网站时最后都会报出这样一段错误，提升level也没用，一开始以为是网站原因，后来测试自己搭建的dvwa也会出现同样的问题！感谢路过的大佬能给点高见！！！
all tested parameters do not appear to be injectable. Try to increase values for '--level'/'--risk' options if you wish to perform more tests. If you suspect that there is some kind of protection mechanism involved (e.g. WAF) maybe you could try to use option '--tamper' (e.g. '--tamper=space2comment')
