Reverse-Proxy formatierung und Bilder fehlen

map $http_upgrade $connection_upgrade {
  default upgrade;
  ''      close;  
}


server {
  listen 80;
  server_name formulare.meinedomain.de;
  return 301 https://$host$request_uri;
  client_max_body_size 10000M;
}

# SSL configuration
server {
  listen 443 ssl;
  server_name formulare.meinedomain.de;
  ssl_certificate      /etc/letsencrypt/live/formulare.meinedomain.de/fullchain.pem;
  ssl_certificate_key  /etc/letsencrypt/live/formulare.meinedomain.de/privkey.pem;

  # Improve HTTPS performance with session resumption
  ssl_session_cache shared:SSL:10m;
  ssl_session_timeout 5m;

  # Enable server-side protection against BEAST attacks
  ssl_prefer_server_ciphers on;
  ssl_ciphers ECDH+AESGCM:ECDH+AES256:ECDH+AES128:DH+3DES:!ADH:!AECDH:!MD5;

  # Disable SSLv3
  ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
fastcgi_buffers 64 4K;
  # Diffie-Hellman parameter for DHE ciphersuites
  ssl_dhparam /etc/ssl/certs/dhparam.pem;

  # Enable HSTS (https:{{comment_single_line_double_slash:1}}
  add_header Strict-Transport-Security "max-age=63072000; includeSubdomains";  

  # Enable OCSP stapling (http:{{comment_single_line_double_slash:2}}
  ssl_stapling on;
  ssl_stapling_verify on;
  ssl_trusted_certificate /etc/letsencrypt/live/formulare.meinedomain.de/fullchain.pem;
  resolver 8.8.8.8 8.8.4.4 valid=300s;
  resolver_timeout 5s;

  location / {
    proxy_pass http://ipadressevonformtools;
    proxy_set_header Host $host;
    proxy_redirect http:// https://;
    proxy_http_version 1.1;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;
    client_max_body_size 10000M;
  }