Prestashop 1.7.3.3 Nginx conf + SSL (Letsencrypt) + HTTP/2

yoursite.conf

server {
    charset utf-8;

    #listen SERVER_IP:80;

    server_name YOUR_SITE_DOMAIN www.YOUR_SITE_DOMAIN;
    root        ROOT_PATH_PRESTASHOP;
    index       index.php;
    set $admin_dir /ADMIN_PATH;

    access_log  /var/log/nginx/domains/YOUR_SITE_DOMAIN.log combined;
    #access_log  /var/log/nginx/domains/YOUR_SITE_DOMAIN.bytes bytes;
    error_log   /var/log/nginx/domains/YOUR_SITE_DOMAIN.error.log error;

    location = /favicon.ico {
        log_not_found off;
        access_log off;
    }

    location = /robots.txt {
        auth_basic off;
        allow all;
        log_not_found off;
        access_log off;
    }

    # Deny all attempts to access hidden files such as .htaccess, .htpasswd, .DS_Store (Mac).
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }


    ##
    # Gzip Settings
    ##

    gzip on;
    gzip_disable "msie6";                                             # Do people still use Internet Explorer 6? In that case, disable gzip and hope for the best!
    gzip_vary on;                                                     # Also compress content with other MIME types than "text/html"
    gzip_types application/json text/css application/javascript;      # We only want to compress json, css and js. Compressing images and such isn't worth it
    gzip_proxied any;
    gzip_comp_level 6;                                                # Set desired compression ratio, higher is better compression, but slower
    gzip_buffers 16 8k;                                               # Gzip buffer size
    gzip_http_version 1.0;                                            # Compress every type of HTTP request


    # Global rewrite not depending on languages
    rewrite ^/api/?(.*)$ /webservice/dispatcher.php?url=$1 last;
    rewrite "^/c/([0-9]+)(\-[_a-zA-Z0-9-]*)/(.*)\.jpg$" /img/c/$1$2.jpg last;
    rewrite "^/c/([_a-zA-Z-]+)/(.*)\.jpg$" /img/c/$1.jpg last;
    rewrite "^/([a-z0-9]+)\-([a-z0-9]+)(\-[_a-zA-Z0-9-]*)/(\P{M}\p{M}*)*\.jpg$" /img/p/$1-$2$3.jpg last;
    rewrite "^/([0-9]+)\-([0-9]+)/(\P{M}\p{M}*)*\.jpg$" /img/p/$1-$2.jpg last;
    rewrite "^/([0-9])(\-[_a-zA-Z0-9-]*)?/(\P{M}\p{M}*)*\.jpg$" /img/p/$1/$1$2.jpg last;
    rewrite "^/([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/(\P{M}\p{M}*)*\.jpg$" /img/p/$1/$2/$1$2$3.jpg last;
    rewrite "^/([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/(\P{M}\p{M}*)*\.jpg$" /img/p/$1/$2/$3/$1$2$3$4.jpg last;
    rewrite "^/([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/(\P{M}\p{M}*)*\.jpg$" /img/p/$1/$2/$3/$4/$1$2$3$4$5.jpg last;
    rewrite "^/([0-9])([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/(\P{M}\p{M}*)*\.jpg$" /img/p/$1/$2/$3/$4/$5/$1$2$3$4$5$6.jpg last;
    rewrite "^/([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/(\P{M}\p{M}*)*\.jpg$" /img/p/$1/$2/$3/$4/$5/$6/$1$2$3$4$5$6$7.jpg last;
    rewrite "^/([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/(\P{M}\p{M}*)*\.jpg$" /img/p/$1/$2/$3/$4/$5/$6/$7/$1$2$3$4$5$6$7$8.jpg last;
    rewrite "^/([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?/(\P{M}\p{M}*)*\.jpg$" /img/p/$1/$2/$3/$4/$5/$6/$7/$8/$1$2$3$4$5$6$7$8$9.jpg last;
    rewrite "^/([0-9]+)\-(\P{M}\p{M}*)+\.html(.*)$" /index.php?controller=product&id_product=$1$3 last;
    rewrite "^/([0-9]+)\-([a-zA-Z0-9-]*)(.*)$" /index.php?controller=category&id_category=$1$3 last;
    rewrite "^/([a-zA-Z0-9-]*)/([0-9]+)\-([a-zA-Z0-9-]*)\.html(.*)$" /index.php?controller=product&id_product=$2$4 last;
    rewrite "^/([0-9]+)__([a-zA-Z0-9-]*)(.*)$" /index.php?controller=supplier&id_supplier=$1$3 last;
    rewrite "^/([0-9]+)_([a-zA-Z0-9-]*)(.*)$" /index.php?controller=manufacturer&id_manufacturer=$1$3 last;
    rewrite "^/content/([0-9]+)\-([a-zA-Z0-9-]*)(.*)$" /index.php?controller=cms&id_cms=$1$3 last;
    rewrite "^/content/category/([0-9]+)\-([a-zA-Z0-9-]*)(.*)$" /index.php?controller=cms&id_cms_category=$1$3 last;
    rewrite "^/module/([_a-zA-Z0-9-]*)/([_a-zA-Z0-9-]*)$" /index.php?fc=module&module=$1&controller=$2 last;
    rewrite "^/stock/([_a-zA-Z0-9-]*)/([_a-zA-Z0-9-]*)$" /index.php?controller=$1$2 last;

    try_files $uri $uri/ /index.php?$args;

    # Symfony controllers Specific for 1.7
    location ~ /(international|_profiler|module|product|combination|specific-price)/(.*)$ {
        try_files $uri $uri/ /index.php?q=$uri&$args $admin_dir/index.php$is_args$args;
    }


    location /ADMIN_PATH/ {  # Change this for your admin url
        if (!-e $request_filename) {
            rewrite ^/.*$ /ADMIN_PATH/index.php last;
        }
    }

    location / {
        if (!-e $request_filename) {
            rewrite ^/.*$ /index.php last;
        }
    }

    location ~ .php$ {
        fastcgi_split_path_info ^(.+.php)(/.*)$;
        try_files $uri =404;
        fastcgi_keep_conn on;
        include /etc/nginx/fastcgi_params;
        fastcgi_pass unix:/var/run/php/php7.1-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_read_timeout 60m;
        fastcgi_send_timeout 60m;
        fastcgi_buffer_size 128k;
        fastcgi_buffers 256 16k;
        fastcgi_max_temp_file_size 0;
        fastcgi_busy_buffers_size 256k;
        fastcgi_temp_file_write_size 256k;
    }

    listen SERVER_IP:443 ssl http2; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/YOUR_SITE_DOMAIN/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/YOUR_SITE_DOMAIN/privkey.pem; # managed by Certbot

    ssl_session_cache shared:le_nginx_SSL:1m;
    ssl_session_timeout 1440m;

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_prefer_server_ciphers on;
    ssl_ciphers EECDH+CHACHA20:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:EECDH+3DES:RSA+3DES:!MD5;
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem


}


server {
    listen SERVER_IP:80;
    server_name YOUR_SITE_DOMAIN;
    return 301 https://$host$request_uri;
}

Replace this variables:

YOUR_SITE_DOMAIN
SERVER_IP
ADMIN_PATH
ROOT_PATH_PRESTASHOP