https:// redirect to https://www in NGINX

Question

How do you redirect all non-www links to my website to https://www. I know that there are a lot of solutions for .htaccess but I haven't been able to find anything sufficient for nginx.

At the moment all I have is

##
# Redirect non-www to www
##
server {
     listen 80;
     server_name example.com; # add other domains separated by a space as necessary
     rewrite ^/(.*)$ https://www.example.com/$1 permanent;
}

which redirects:

example.com
www.example.com
http://example.com
http://www.example.com

to https://www.example.com which is what I want, except that https://example.com doesn't redirect https://www.example.com

How do so how do I get https:// to redirect to https://www.?

Answer 1

Since my last answer using the "if" statement is not recommended in most cases, I came up with another solution which seems to be working perfectly.

What I did was create another server block with www in the server_name and had my other server blocks redirect to it.

server {
    listen 80;
    listen [::]:80 default_server ipv6only=on;
    return 301 https://www.example.com$request_uri;
}

# HTTPS — proxy all requests to the Node app
server {
    # Enable HTTP/2
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name example.com;
    return 301 https://www.example.com$request_uri;

    # Use the Let’s Encrypt certificates
    ...
}

server {
    # Enable HTTP/2
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name www.example.com;

    # Use the Let’s Encrypt certificates
    ...
}

Answer 2

So far what I came up with is a simple if statement under port 443 to check if the domain is non-www and then redirect to www

server {
# Enable HTTP/2
listen 443 ssl http2;
listen [::]:443 ssl http2;
server_name example.com;
if ($host = example.com) {
    return 301 https://www.example.com$request_uri;
}

# Use the Let’s Encrypt certificates
...

I'm no expert but I don't think this is the best solution because it will be doing an if statement for every request if I'm right?