Nginx proxy_pass doesn't send all of the request path to the server

Question

The Environment:
I have a proxy server(nginx image) on port 80, an nginx server for backend on 81 and a backend(laravel) server on port 9000 all configured inside docker compose.

info:
In access.log file of nginx server I can see the url '/login' of 'GET' method is requested by proxy server but for some reason nginx server is only sending: '/' request to backend server.
I also checked the full url in backend with this facade Request::fullUrl() and it returns 'http://backend'.
Also if I uncomment # try_files $uri =404; line in nginx.conf it only responses with 404.

Question:
How can I fix that?
How can I send the whole url to my backend server?

docker-compose.yml file:

version: "3.8"
services:
    nginx:
        image: nginx
        container_name: thecliniclaravel_nginx
        ports:
            - "80:80"
        volumes:
            - ./docker/nginx/nginx.conf:/etc/nginx/conf.d/default.conf:rw
            - ./docker/log/nginx:/var/log/nginx:rw
        networks:
            - thecliniclaravel_bridge
        depends_on:
            - backend
    backend:
        container_name: thecliniclaravel_backend
        build:
            context: ./
        volumes:
            - thecliniclaravel_backend_vendor:/var/www/html/backend/vendor:rw
            - .:/var/www/html/backend:rw

            - ./docker/php/xdebug.ini:/usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini:rw
            - ./docker/php/addon.ini:/usr/local/etc/php/conf.d/addon.ini:rw
        networks:
            - thecliniclaravel_bridge
    frontend:
        container_name: thecliniclaravel_frontend
        build:
            context: ../thecliniclaravel_frontend
        volumes:
            - ../thecliniclaravel_frontend:/var/www/html/frontend:rw
        networks:
            - thecliniclaravel_bridge
volumes:
    thecliniclaravel_backend_vendor: {}
networks:
    thecliniclaravel_bridge:
        driver: bridge

nginx.conf:

upstream backend {
    server backend:9000;

    keepalive 8;
}

# upstream frontend {
#     server frontend:5000;
# }

index index.php;

server {
    listen 80;

    error_log /var/log/nginx/error.log;
    access_log /var/log/nginx/access.log;

    proxy_set_header Host $host;
    proxy_http_version 1.1;
    proxy_set_header Connection "";

    location /backend/ {
        proxy_pass http://localhost:81/;
    }

    location /frontend/ {
        proxy_pass http://localhost:82/;
    }
}

server {
    listen 81;

    root /var/www/html/backend/public;

    error_log /var/log/nginx/backend_error.log;
    access_log /var/log/nginx/backend_access.log;

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }

    location ~ \.php$ {
        try_files $uri =404;

        fastcgi_pass backend;
        fastcgi_index index.php;

        fastcgi_keep_conn on;

        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_param REQUEST_METHOD $request_method;
        fastcgi_param CONTENT_TYPE $content_type;
        fastcgi_param CONTENT_LENGTH $content_length;
        fastcgi_param REDIRECT_STATUS 200;
    }
}

server {
    listen 82;

    error_log /var/log/nginx/frontend_error.log;
    access_log /var/log/nginx/frontend_access.log;

    root /var/www/html/frontend/public;
    #.
    #.
    #.
}

Answer 1

Omg, finally, i forgot to put this in the backend server block in nginx.conf file: include fastcgi_params;
It's absence was causing my backend to miss other parts of the request except the 'http://localhost'.

(Sometimes i just want smash my head toward this wall beside me.
any way thank you @user973254 )