How to fix http 414 Request-URI Too Large error on nginx?

I want all traffic going to my web server to be redirected to https on Nginx. However, when I go to my website at http://www.example.com, I get the error "414 Request-URI Too Large" and the URL is ridiculously long -- http://www.example.com/http:://www.example.com/http:: -- and it goes on for a while, which I am assuming is what is giving me this error. But I don't know how to fix this redirection error because my config file for Nginx doesn't contain a $request_uri parameter.

Here's the Nginx config file:

server {    server_name  example.com;    return 301 https://www.example.com;listen 443 ssl; ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem; ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem; include /etc/letsencrypt/options-ssl-nginx.conf; ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; }server { root /var/www/html; ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem; # managed by Certbot ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem; # managed by Certbot    # Add index.php to the list if you are using PHP    index index.html index.htm index.nginx-debian.html;    server_name www.example.com;    location / {            # First attempt to serve request as file, then            # as directory, then fall back to displaying a 404.            proxy_pass http://localhost:8080; #whatever port your app runs on            proxy_http_version 1.1;           proxy_set_header Upgrade $http_upgrade;            proxy_set_header Connection 'upgrade';            proxy_set_header Host $host;            proxy_cache_bypass $http_upgrade;              }    }server {  if ($host = www.example.com) {     return 301 https://www.example.com;  }   if ($host = example.com) {    return 301 https://www.example.com;  }   listen 80 default_server;  server_name  example.com www.example.com;  return 404; }

Any help would be greatly appreciated!