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背景：ssl on打开后直接访问Http，出现400错，想能通过Http访问到，得注释掉ssl on;即可。
Problem
When viewing any of my sites using port 80, the following error appeared on non-SSL websites:

Nginx 400 Bad Request The plain HTTP request was sent to HTTPS port
Original server block:

server {
    listen 80;
    listen 443;

    ssl on;
    ssl_certificate         /path/to/cert/example.pem;
    ssl_certificate_key     /path/to/cert/example.private.key;

    root /path/to/wordpress;
    index index.php;

    # Website URL
    server_name blog.duaneleem.com;

    # etc...
}


Solution
After reading NGINX documentation, the solution to this was to place the SSL directive on “listen.” Here’s a sample server block that demonstrates this:

server {
    listen 80;
    listen 443 ssl;

    ssl_certificate         /path/to/cert/example.pem;
    ssl_certificate_key     /path/to/cert/example.private.key;

    root /path/to/wordpress;
    index index.php;

    # Website URL
    server_name blog.duaneleem.com;

    # etc...
}
By adding “ssl” to the listen directive to all my server blocks, everything started working again.


From： https://blog.duaneleem.com/nginx-ssl-on/

作者：jackxiang@向东博客 专注WEB应用 构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除
地址：https://jackxiang.com/post/9853/
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