Nginx HTTPS在HTTP返回404时起作用

Question

当我访问https://mydomain/my-slug时-得到有效的200响应。 但是，当我访问http://mydomain/my-slug时-Nginx返回404。

这是我的Nginx配置：

# Map CloudFront Header to a variable
map $http_cloudfront_forwarded_proto $cloudfront_proto {
    default "http";
    https "https";
}

server {
    listen 80;
    listen 443;
    server_name mysite.com;

    root /var/www/wordpress;
    index index.php;

    location / {

        set $redirect_to_https 0;
        if ( $cloudfront_proto != 'https' ) {
            set $redirect_to_https 1;
        }

        if ( $request_uri = '/health' ) {
            set $redirect_to_https 0;
        }

        if ( $redirect_to_https = 1 ) {
#            return 301 https://$host$request_uri;
        }


        # This is cool because no php is touched for static content.
        # include the "?$args" part so non-default permalinks doesn't break when using query string
        try_files $uri $uri/ /index.php?$args;
    }

    location ~ \.php$ {
        try_files $uri $uri/ /index.php?$args =404;
        fastcgi_pass unix:/var/run/php/php5.6-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }

    include global/restrictions.conf;
    include global/pagespeed.conf;
}

我在这里错过了什么配置？ 出于当前问题调试的目的，已禁用了SSL重定向。