title: I'm experiencing 502 Bad Gateway errors when accessing curl 127.0.0.1/health in my Nginx & Django application. The error log appears to be like this :
body: <p>I've never experienced this before. What is the solution for this type of 502 Gateway error?</p>
  <p>this is my etc/nginx/sites-available/default configuration</p>
  <pre><code>##
  # You should look at the following URL's in order to grasp a solid understanding
  # of Nginx configuration files in order to fully unleash the power of Nginx.
  # https://www.nginx.com/resources/wiki/start/
  # https://www.nginx.com/resources/wiki/start/topics/tutorials/config_pitfalls/
  # https://wiki.debian.org/Nginx/DirectoryStructure
  #
  # In most cases, administrators will remove this file from sites-enabled/ and
  # leave it as reference inside of sites-available where it will continue to be
  # updated by the nginx packaging team.
  #
  # This file will automatically load configuration files provided by other
  # applications, such as Drupal or Wordpress. These applications will be made
  # available underneath a path with that package name, such as /drupal8.
  #
  # Please see /usr/share/doc/nginx-doc/examples/ for more detailed examples.
  ##
  
  # Default server configuration
  #
  #server {
          #listen 80 default_server;
          #listen [::]:80 default_server;
  
          # SSL configuration
          #
          # listen 443 ssl default_server;
          # listen [::]:443 ssl default_server;
          #
          # Note: You should disable gzip for SSL traffic.
          # See: https://bugs.debian.org/773332
          #
          # Read up on ssl_ciphers to ensure a secure configuration.
          # See: https://bugs.debian.org/765782
          #
          # Self signed certs generated by the ssl-cert package
          # Don't use them in a production server!
          #
          # include snippets/snakeoil.conf;
  
          #root /var/www/html;
  
          # Add index.php to the list if you are using PHP
          #index index.html index.htm index.nginx-debian.html;
  
          #server_name _;
  
          #location / {
                  # First attempt to serve request as file, then
                  # as directory, then fall back to displaying a 404.
                  #try_files $uri $uri/ =404;
          #}
  
          # pass PHP scripts to FastCGI server
          #
          #location ~ \.php$ {
          #       include snippets/fastcgi-php.conf;
          #
          #       # With php-fpm (or other unix sockets):
          #       fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
          #       # With php-cgi (or other tcp sockets):
          #       fastcgi_pass 127.0.0.1:9000;
          #}
  
          # deny access to .htaccess files, if Apache's document root
          # concurs with nginx's one
          #
          #location ~ /\.ht {
          #       deny all;
          #}
  #}
  server {
     listen 80;
     client_max_body_size 20M;
     server_name 15.207.53.176;
     location /static {
          alias /home/ubuntu/new_backend_repo;
  
     }
  
     location /media {
          alias /home/ubuntu/new_backend_repo;
  
     }
  
     location / {
             access_log /var/log/nginx/access.log upstream_time;
  
             proxy_pass http://127.0.0.1:8000;
             proxy_http_version 1.1;
             proxy_set_header Upgrade $http_upgrade;
             proxy_set_header Connection &quot;upgrade&quot;;
  
             proxy_redirect     off;
             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-Host $server_name;
             proxy_read_timeout 90;
  
         }
  
  }
  
  
  # Virtual Host configuration for example.com
  #
  # You can move that to a different file under sites-available/ and symlink that
  # to sites-enabled/ to enable it.
  #
  #server {
  #       listen 80;
  #       listen [::]:80;
  #
  #       server_name example.com;
  #
  #       root /var/www/example.com;
  #       index index.html;
  #
  #       location / {
  #               try_files $uri $uri/ =404;
  #       }
  #}
  
  </code></pre>
  <p>nginx -t is returning
  nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
  nginx: configuration file /etc/nginx/nginx.conf test is successful</p>
  <p>and service nginx configtest returns ok</p>