Why are images in nginx passed as text/html?

Question

Nginx

Full stack application, everything worked fine on the local machine. After landing on nginx and getting ssl, everything works except for one thing, images from static are received in the wrong type, namely text/html:

Here are the configs:
/etc/nginx/nginx.conf

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
        worker_connections 768;
}

http {
        sendfile on;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 65;
        types_hash_max_size 2048;
        include /etc/nginx/mime.types;
        default_type application/octet-stream;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE
        ssl_prefer_server_ciphers on;
        access_log /var/log/nginx/access.log;
        error_log /var/log/nginx/error.log;
        gzip on;
        proxy_pass_header Content-Type;
        include /etc/nginx/conf.d/*.conf;
        include /etc/nginx/sites-enabled/*;
}

/etc/nginx/sites-enabled/default

upstream client-upstream {
    server    0.0.0.0:3000;
    keepalive 15;
}

upstream back-upstream {
    server    0.0.0.0:5000;
    keepalive 15;
}

server {
    server_name DOMAINNAME.ru www.DOMAINNAME.ru;
    server_tokens off;
    client_max_body_size 1000M;
    root /var/www/prod/public;
    index index.php index.html index.htm;

    location / {
         proxy_pass http://client-upstream;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection $http_upgrade;
         proxy_set_header Host $host;

    }

    location /api {
         proxy_pass http://back-upstream;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
    }

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/DOMAINNAME.ru/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/DOMAINNAME.ru/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}


server {
    if ($host = DOMAINNAME.ru) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


  listen 80;
    server_name DOMAINNAME.ru www.DOMAINNAME.ru;
    return 404; # managed by Certbot
}

PS Application: ReactJS client, NodeJS api, 2 processes on pm2, hierarchy:

client
        src 
             components 
                      some_component.js (достаются в виде https://DOMAIN.RU/file_name.jpg)
server
         static (изображения хранятся здесь)

Answer 1

Two questions - who is in charge of specifying MIME and what types are specified in the configuration?
"In the forehead" solution - in the desired location specify add_header Content-Type image/jpg; But this is not very correct.
Here you will find the answer