Merge pull request #338 from youyong205/master

refactor
Merge pull request #339 from youyong205/master

modify the testcase
由于nginx还未确定制定，引入Null 的bug
Merge pull request #341 from youyong205/master

modify the jsp
Merge pull request #340 from jialinsun/master

由于nginx还未确定制定，引入Null 的bug