Caddyfile

{
  admin off

  servers :443 {
    protocol {
      # experimental_http3
    }
  }
  
  servers :80 {
    protocol {
      allow_h2c
    }
  }
}

{$SEARXNG_HOSTNAME} {

  log {
      output discard
  }

  @api {
      path /config
      path /healthz
      path /stats/errors
      path /stats/checker
  }

  @static {
      path /static/*
  }

  @notstatic {
      not path /static/*
  }

  @imageproxy {
      path /image_proxy
  }

  @notimageproxy {
      not path /image_proxy
  }

  header {
      # Enable HTTP Strict Transport Security (HSTS) to force clients to always connect via HTTPS
      Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"

      # Enable cross-site filter (XSS) and tell browser to block detected attacks
      X-XSS-Protection "1; mode=block"

      # Prevent some browsers from MIME-sniffing a response away from the declared Content-Type
      X-Content-Type-Options "nosniff"

      # Disable some features
      Permissions-Policy "accelerometer=(),ambient-light-sensor=(),autoplay=(),camera=(),encrypted-media=(),focus-without-user-activation=(),geolocation=(),gyroscope=(),magnetometer=(),microphone=(),midi=(),payment=(),picture-in-picture=(),speaker=(),sync-xhr=(),usb=(),vr=()"

      # Disable some features (legacy)
      Feature-Policy "accelerometer 'none';ambient-light-sensor 'none'; autoplay 'none';camera 'none';encrypted-media 'none';focus-without-user-activation 'none'; geolocation 'none';gyroscope 'none';magnetometer 'none';microphone 'none';midi 'none';payment 'none';picture-in-picture 'none'; speaker 'none';sync-xhr 'none';usb 'none';vr 'none'"

      # Referer
      Referrer-Policy "no-referrer"

      # X-Robots-Tag
      X-Robots-Tag "noarchive, nofollow"

      # Remove Server header
      -Server
  }

  header @api {
      Access-Control-Allow-Methods "GET, OPTIONS"
      Access-Control-Allow-Origin  "*"
  }

  # Cache
  header @static {
      # Cache
      Cache-Control "public, max-age=31536000"
      defer
  }

  header @notstatic {
      # No Cache
      Cache-Control "no-cache, no-store"
      Pragma "no-cache"
  }

  # CSP (see http://content-security-policy.com/ )
  header @imageproxy {
      Content-Security-Policy "default-src 'none'; img-src 'self' data:"
  }

  header @notimageproxy {
      Content-Security-Policy "upgrade-insecure-requests; default-src 'none'; script-src 'self'; style-src 'self' 'unsafe-inline'; form-action 'self' https://github.com/searxng/searxng/issues/new; font-src 'self'; frame-ancestors 'self'; base-uri 'self'; connect-src 'self' https://overpass-api.de; img-src 'self' data: https://*.tile.openstreetmap.org; frame-src https://www.youtube-nocookie.com https://player.vimeo.com https://www.dailymotion.com https://www.deezer.com https://www.mixcloud.com https://w.soundcloud.com https://embed.spotify.com"
  }

  header /robots.txt {
    User-agent : *
    Disallow :
  } 

  # SearXNG
  handle {
      encode zstd gzip

      reverse_proxy localhost:8080 {
          header_up X-Forwarded-Port {http.request.port}
          header_up X-Forwarded-Proto {http.request.scheme}
      }

  }

}

www.{$SEARXNG_HOSTNAME} {
   redir https://{$SEARXNG_HOSTNAME}{uri} permanent
}