How to Configure Nginx force HTTP to redirect to HTTPS Step by Step?

This guide will show you how to redirect HTTP to HTTPS using Nginx.

Table of content

Configure Nginx SSL 

force HTTP to redirect to HTTPS 

force non-www to  www

Prerequisites

OS:Ubuntu 18.04 *64。A Linux server running Nginx

nginx version: nginx/1.14.0 (Ubuntu)

2.转发思路

Browser(https) ---> Nginx (server port 443 ssl)----> HTTP ----> Kestrel

Browser(http) ---> Nginx (server port 80 http)-->redirect 301--> Nginx (server port 443 ssl)----> HTTP ----> Kestrel (force HTTP to redirect to HTTPS )

配置http不带www域名转发

Browser(http://example.com) --->(https://www.example.com) ---> Nginx (server port 443 ssl)----> HTTP ----> Kestrel

配置https不带www域名转发

Browser(https://example.com) --->(https://www.example.com)---> Nginx (server port 443 ssl)----> HTTP ----> Kestrel

To enforce an HTTP to HTTPS redirect, you need to edit the Nginx configuration file.

In most cases, you can locate the file in the /etc/nginx/sites-available directory.

Step 1:create web server port  443 in nginx 

vi /etc/nginx/sites-enabled

Create 1 server blocks in the /etc/nginx/sites-enabled file

Step 2:create web server port  80 in nginx 

step 3:Redirect HTTP to HTTPS per Site 

we recommend to force all your webshop traffic from http:// to https://

server {
       listen       80; #监听端口
       server_name  a.domain.com b.domain.com c.domain.com; #请求域名
       return      301 https://$host$request_uri; #重定向至https访问。
   }

Step 4：Redirect from www website to non-www website

server {

    server_name www.new_company.com;

    return 301 $scheme://new_company.com$request_uri;

}

other:

Redirect All Sites to HTTPS

server {
	listen 80 default_server;
	listen [::]:80 default_server;
	server_name _;
	return 301 https://$host$request_uri;
}

or

Let’s analyze the code line by line:

listen 80 default_server - Sets this server block as the default (catch-all) block for all unmatched domains.
server_name _ - _ is an invalid domain name that never matches any real domain name.
return 301 https://$host$request_uri - Redirect the traffic to the corresponding HTTPS server block with status code 301 (Moved Permanently). The $host variable holds the domain name of the request.
For example, if the visitor opens http://example.com/page2 in the browser, Nginx will redirect the request to https://example.com/page2.

Redirect to www

if ($host !~* ^www\.) {
    return 301 https://www.$host$request_uri; 
}

Redirect to non-www

if ($host ~* ^www\.(.*)) {
    set $host_without_www $1;
rewrite ^(.*) http://$host_without_www$1 permanent;
}