How does Nginx automatically jump from http to https?

https is a safer version of http. Automatically jumping to https through http can make it easier for users to use the web.

There are several ways to complete the jump:

1. Open the http and https servers and let http jump to https

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

server {
    listen 443 ssl;
    listen [::]:443 ssl;

    ssl_certificate         certificate_file_path;
    ssl_certificate_key  certificate_key_file_path;

    ...

}

2. Do not open http server, complete the jump directly in the https server, the following three methods can be used

server {

    if ($server_port = 80 )   

    #if ($scheme = http )

    #if ($ssl_protocol = "")

    {
        return 301 https://$host$request_uri;
    }

    
    listen 443 ssl;
    listen [::]:443 ssl;

    ssl_certificate         certificate_file_path;
    ssl_certificate_key  certificate_key_file_path;

    ...

}

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