I get the error when doing reverse proxy

General
1

I have a docker application running on droplet at Digitalocean.
Docker application works smoothly when I stand up.
The api works when I go directly to the IP address.

But when I go to the domain address that I redirect, I get “Bad request 400” error.
The address to which I redirect the subdomain
https://api.mywebsite.com

How can I fix this?
I don’t know where he made a mistake.

Thanks for your help

My nginx.conf file is as follows.
nginx.conf

upstream rest_server{
 server django-api:8000;
}
server{
 listen 80;
  resolver 127.0.0.11;
  location /.well-known/acme-challenge/ {
      root /var/www/certbot;
  }
 location / {
  proxy_pass http://restgunicorn_server;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header Host $host;
  proxy_redirect off;
 }
 location /static/ {
  alias /opt/services/hastatakip-django-api/static/;
 }
 location /media/ {
  alias /opt/services/hastatakip-django-api/media/;
 }
}
**# SSL**
server {
    listen 443 ssl;
    resolver 127.0.0.11;
    ssl_certificate /usr/share/nginx/certificates/fullchain.pem;
    ssl_certificate_key /usr/share/nginx/certificates/privkey.pem;
    include /etc/ssl-options/options-nginx-ssl.conf;
    ssl_dhparam /etc/ssl-options/ssl-dhparams.pem;

    location / {
     proxy_pass http://restgunicorn_server;
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header Host $host;
     proxy_redirect off;
    }
}

docker-compose.yml

version: '3'
services:
  django-api:
     build: .
     volumes:
      - .:/code
      - static_volume:/opt/services/hastatakip-django-api/static
      - media_volume:/opt/services/hastatakip-django-api/media
     expose:
      - "8000"
     ports:
      - "8000:8000"
     networks:
      - nginx_network
      - djangodb_network
     depends_on:
      - djangodb

  nginx:
    build:
      context: .
      dockerfile: Dockerfile.lets
    expose:
     - 80
    ports:
     - "80:80"
     - "443:443"
    environment:
      DOMAIN: api.mywebsite.net
      EMAIL: mymail@aaa.com
      RENEW_INTERVAL: 12h
    volumes:
     - ./certificates:/usr/share/nginx/certificates
     - ./config/nginx/conf.d:/etc/nginx/conf.d
     - static_volume:/opt/services/django-api/static
     - media_volume:/opt/services/django-api/media
    depends_on:
     - django-api
    networks:
     - nginx_network
2

please help, i need to fix it