对nginx的特定URL进行ssl加密参数无法传递

环境中前端一台nginx，后端tomcat，现在要对client到nginx的请求进行ssl加密，考虑到速度的影响，只对动态请求加密（即所有已.do结尾的请求），其它js/png 等文件不加密，为避免https与http混排的问题，jsp也不加密。
nginx.conf主要配置:

server {
    listen       80;
    server_name  localhost;
    ...
    location / {
        root  /apps/oa/oaapp/OA1;
        index  index.jsp index.html;
    }
    location ~ .*\.do$ {
        rewrite ^(.*)$ https://ittest.example.com$1 permanent;
    }
}

    server {
        listen 443;
        server_name ittest.example.com;

        ssl on;
        ...

    location / {
        proxy_set_header Host $host:$server_port;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://localhost:8080/;
    }        

比如现在访问登录页面login.html时，发送用户名密码请求http://ittest.example.com/member/login.do，按照上面的规则应该被rewrite到https://ittest.example.com/member/login.do处理，我从chrome也确实看到了301重定向了，但是，新的https请求方法变成了GET，用户名密码信息也没从http传送过去。请问该怎么解决？

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301就是这样的，可以尝试配置307状态码，在现代浏览器中它不会把post转化为get

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