Nginx

"Nginx (pronounced "engine X") is a web server which can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache. The software was created by Igor Sysoev and first publicly released in 2004.[9] A company of the same name was founded in 2011 to provide support and Nginx plus paid software." - Wikipedia

Nginx from a subdomain (jellyfin.example.org)

Warning

HTTP is insecure. The following configuration is provided for ease of use only. If you are planning on exposing your server over the Internet you should setup HTTPS. Let's Encrypt can provide free TLS certificates which can be installed easily via certbot. Using only HTTP will expose passwords and API keys.

Create the file /etc/nginx/conf.d/jellyfin.conf which will forward requests to Jellyfin.

# Uncomment the commented sections after you have acquired a SSL Certificate
server {
    listen 80;
    listen [::]:80;
    # server_name DOMAIN_NAME;

    # Uncomment to redirect HTTP to HTTPS
    # return 301 https://$host$request_uri;
#}

#server {
    # listen 443 ssl http2;
    # listen [::]:443 ssl http2;
    server_name DOMAIN_NAME;

    # use a variable to store the upstream proxy
    # in this example we are using a hostname which is resolved via DNS
    # (if you aren't using DNS remove the resolver line and change the variable to point to an IP address e.g `set $jellyfin 127.0.0.1`)
    set $jellyfin jellyfin;
    resolver 127.0.0.1 valid=30;

    #ssl_certificate /etc/letsencrypt/live/DOMAIN_NAME/fullchain.pem;
    #ssl_certificate_key /etc/letsencrypt/live/DOMAIN_NAME/privkey.pem;
    #include /etc/letsencrypt/options-ssl-nginx.conf;
    #ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
    #add_header Strict-Transport-Security "max-age=31536000" always;
    #ssl_trusted_certificate /etc/letsencrypt/live/DOMAIN_NAME/chain.pem;
    #ssl_stapling on;
    #ssl_stapling_verify on;

    # Security / XSS Mitigation Headers
    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Content-Type-Options "nosniff";

    # Content Security Policy
    # See: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
    # Enforces https content and restricts JS/CSS to origin
    # External Javascript (such as cast_sender.js for Chromecast) must be whitelisted.
    #add_header Content-Security-Policy "default-src https: data: blob:; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' https://www.gstatic.com/cv/js/sender/v1/cast_sender.js; worker-src 'self' blob:; connect-src 'self'; object-src 'none'; frame-ancestors 'self'";

    location / {
        # Proxy main Jellyfin traffic
        proxy_pass http://$jellyfin:8096;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Protocol $scheme;
        proxy_set_header X-Forwarded-Host $http_host;

        # Disable buffering when the nginx proxy gets very resource heavy upon streaming
        proxy_buffering off;
    }

    # location block for /web - This is purely for aesthetics so /web/#!/ works instead of having to go to /web/index.html/#!/
    location ~ ^/web/$ {
        # Proxy main Jellyfin traffic
        proxy_pass http://$jellyfin:8096/web/index.html/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Protocol $scheme;
        proxy_set_header X-Forwarded-Host $http_host;
    }

    location /socket {
        # Proxy Jellyfin Websockets traffic
        proxy_pass http://$jellyfin:8096;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Protocol $scheme;
        proxy_set_header X-Forwarded-Host $http_host;
    }
}

Nginx with Subpath (example.org/jellyfin)

When connecting to server from a client application, enter http(s)://DOMAIN_NAME/jellyfin in the address field.

Set the base URL field in the Jellyfin server. This can be done by navigating to the Admin Dashboard -> Networking -> Base URL in the web client. Fill in this box with /jellyfin and click Save. The server will need to be restarted before this change takes effect.

Warning

HTTP is insecure. The following configuration is provided for ease of use only. If you are planning on exposing your server over the Internet you should setup HTTPS. Let's Encrypt can provide free TLS certificates which can be installed easily via certbot.

# Jellyfin hosted on http(s)://DOMAIN_NAME/jellyfin

server {
    listen 80;
    listen [::]:80;

    server_name DOMAIN_NAME;
    # You can specify multiple domain names if you want
    #server_name jellyfin.local;

    # use a variable to store the upstream proxy
    # in this example we are using a hostname which is resolved via DNS
    # (if you aren't using DNS remove the resolver line and change the variable to point to an IP address e.g `set $jellyfin 127.0.0.1`)
    set $jellyfin jellyfin;
    resolver 127.0.0.1 valid=30;

    # Uncomment and create directory to also host static content
    #root /srv/http/media;
    index index.html;

    location / {
        try_files $uri $uri/ =404;
    }

    # Jellyfin
    location /jellyfin {
        return 302 $scheme://$host/jellyfin/;
    }

    location /jellyfin/ {
        # Proxy main Jellyfin traffic

        # The / at the end is significant.
        # https://www.acunetix.com/blog/articles/a-fresh-look-on-reverse-proxy-related-attacks/

        proxy_pass http://$jellyfin:8096/jellyfin/;

        proxy_pass_request_headers on;

        proxy_set_header Host $host;

        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Host $http_host;

        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $http_connection;

        # Disable buffering when the nginx proxy gets very resource heavy upon streaming
        proxy_buffering off;
    }
}

Extra Nginx Configurations

Cache Video Streams

#Must be in HTTP block
proxy_cache_path  /home/cache/web levels=1:2 keys_zone=cWEB:50m inactive=90d max_size=35000m;
map $request_uri $h264Level { ~(h264-level=)(.+?)& $2; }
map $request_uri $h264Profile { ~(h264-profile=)(.+?)& $2; }

#set in Server block
proxy_cache cWEB;
proxy_cache_valid 200 301 302 30d;
proxy_ignore_headers Expires Cache-Control Set-Cookie X-Accel-Expires;
proxy_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504;
proxy_connect_timeout 10s;
proxy_http_version 1.1;
proxy_set_header Connection "";

location /videos/
  {
  proxy_pass http://myJF-IP:8096;
  proxy_cache_key "mydomain.com$uri?MediaSourceId=$arg_MediaSourceId&VideoCodec=$arg_VideoCodec&AudioCodec=$arg_AudioCodec&AudioStreamIndex=$arg_AudioStreamIndex&VideoBitrate=$arg_VideoBitrate&AudioBitrate=$arg_AudioBitrate&SubtitleMethod=$arg_SubtitleMethod&TranscodingMaxAudioChannels=$arg_TranscodingMaxAudioChannels&RequireAvc=$arg_RequireAvc&SegmentContainer=$arg_SegmentContainer&MinSegments=$arg_MinSegments&BreakOnNonKeyFrames=$arg_BreakOnNonKeyFrames&h264-profile=$h264Profile&h264-level=$h264Level&TranscodeReasons=$arg_TranscodeReasons";
  proxy_cache_valid 200 301 302 30d;
  }

Cache Images

# Add this outside of you server block (i.e. http block)
proxy_cache_path /var/cache/nginx/jellyfin levels=1:2 keys_zone=jellyfin:100m max_size=15g inactive=30d use_temp_path=off;

# Cache images (inside server block)
location ~ /Items/(.*)/Images {
  proxy_pass http://127.0.0.1:8096;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto $scheme;
  proxy_set_header X-Forwarded-Protocol $scheme;
  proxy_set_header X-Forwarded-Host $http_host;

  proxy_cache jellyfin;
  proxy_cache_revalidate on;
  proxy_cache_lock on;
  # add_header X-Cache-Status $upstream_cache_status; # This is only to check if cache is working
}

Ensure that the directory /var/cache/nginx/jellyfin exists and the nginx user has write permissions on it! All the cache options used are explained on Nginx blog and Nginx proxy module.

Rate Limit Downloads

# Add this outside of you server block (i.e. http block)
limit_conn_zone $binary_remote_addr zone=addr:10m;

# Downloads limit (inside server block)
location ~ /Items/(.*)/Download$ {
   proxy_pass http://127.0.0.1:8096;
   proxy_set_header Host $host;
   proxy_set_header X-Real-IP $remote_addr;
   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
   proxy_set_header X-Forwarded-Proto $scheme;
   proxy_set_header X-Forwarded-Protocol $scheme;
   proxy_set_header X-Forwarded-Host $http_host;

   limit_rate 1700k; # Speed limit (here is on kb/s)
   limit_conn addr 3; # Number of simultaneous downloads per IP
   limit_conn_status 460; # Custom error handling
   # proxy_buffering on; # Be sure buffering is on (it is by default on nginx), otherwise limits won't work
}

# Error page
error_page 460 http://your-page-telling-your-limit/;

See here for more