​Nginx HTTP​​服务器的报错“​​400 Bad Request: The plain HTTP request was sent to HTTPS port​​”,本文将讲解如何解决这个问题。简单从报错的字面意思上来看,是因为HTTP请求被发送到HTTPS端口,这种报错多出现在Nginx既处理HTTP请求又处理HTTPS请求的情况。

以下是Nginx常用的SSL配置(出于安全原因,我们使用了本站域名),配置文件将让Nginx侦听80和443端口,并将所有的HTTP请求重定向到HTTPS:

server {
listen 443;
server_name blog.yoodb.com;
charset UTF-8;
ssl on;
ssl_certificate /usr/local/nginx/conf/ssl/blog/2539791_blog.yoodb.com.pem;
ssl_certificate_key /usr/local/nginx/conf/ssl/blog/2539791_blog.yoodb.com.key;
ssl_session_timeout 5m;
ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
if ($scheme = http) {
return 301 https://$host$request_uri;
}
location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto https;
proxy_pass http://172.17.6.114:8082;
}
location ~*/upload/images/ {
expires 1h;
root /mnt/app/project/files;
}
location ~*/dynamic/images/ {
expires 1h;
root /mnt/app/project/files;
}
}


以上的配置看上去都很正常,但是用户请求如果通过80端口来访问网站时,例如使用http://blog.yoodb.com,那么这个请求就会在浏览器收到错误nginx 400 bad request“​​The plain HTTP request was sent to HTTPS port​​”,示例图片如下:

解决故障码400,“”The plain HTTP request was sent to HTTPS port“”_tomcat

Nginx报这种错误是因为每一次用户请求试图通过HTTP访问你的网站,这个请求被重定向到HTTPS。于是Nginx预计使用SSL交互,但原来的请求(通过端口80接收)是普通的HTTP请求,于是会产生错误。

另一方面,如果一个用户使用https://blog.yoodb.com访问网站,他们就不会遇到上述错误。此外,如果你有其他的网站配置为不使用SSL,Nginx会尝试使用HTTPS,这种情况下也会造成上述错误。

解决办法:

将上面配置文中的“ssl on; ” 注释掉或者修改成 “ssl off;”;“listen 443;”修改为“listen 443 ssl”;新增“listen 80”,这样Nginx就可以同时处理HTTP请求和HTTPS请求了,具体参考如下:

server {
listen 80
listen 443 ssl;
server_name blog.yoodb.com;
charset UTF-8;
ssl_certificate /usr/local/nginx/conf/ssl/blog/2539791_blog.yoodb.com.pem;
ssl_certificate_key /usr/local/nginx/conf/ssl/blog/2539791_blog.yoodb.com.key;
ssl_session_timeout 5m;
ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
if ($scheme = http) {
return 301 https://$host$request_uri;
}
location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto https;
proxy_pass http://172.17.6.114:8082;
}
location ~*/upload/images/ {
expires 1h;
root /mnt/app/project/files;
}
location ~*/dynamic/images/ {
expires 1h;
root /mnt/app/project/files;
}
}


java redirect重定向https跳转http问题,如果https访问nginx通过nginx proxy_pass到http的tomcat服务正常能够访问,但是java redirect就跳转到http,导致报错“​​400 Bad Request: The plain HTTP request was sent to HTTPS port​​”。

解决办法:

proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto https;
proxy_pass http://172.17.6.114:8082;
proxy_redirect http:// https://;


实现流程是根据nginx的不同执行阶段,来完成Location http到https。

1)​​proxy_pass​​执行前,先设置了request head host 为https外网访问的域名+端口

2)​​proxy_pass​​执行后,tomcat结果返回response

3)​​proxy_redirect​​修改response中的location中的协议http为https外网访问的协议。

注:java redirect重定向主要是通过访问tomcat服务的请求head项来决定的,默认是http协议,域名是通过读取host地址,默认host中不包括访问端口。