异常：
: PWC4662: Request header is too large
at .(:740)
at .(:657)
at .(:543)
at (:712)
at (:577)
at (:831)
at (:341)
at (:263)
at (:214)
at $(:380)
at (:265)
at (:106)
|#]
解决方法 ：修改tomcat的参数，在properties文件中添加：
tomcat 请求设置
-http-header-size=1048576
//-connections=3000
//-http-post-size=1048576
//-threads=1000