{“status”:400,“message”:“Bad request”} when hit a microservice using Nginx API Gateway

Hi I am trying to consume an api using Nginx API Gateway: I have this url: example.com/api/nodeapp. In my setup I have an Ingress controller which is exposed externally at .com and which takes request do oauth and redirect to internal nginx pod(exposed as Cluster IP service in private cluster) this internal nginx pod will do re route to target microservice pod (also exposed as Cluster IP service in same private cluster). Goal: I browse url as example.com/api/nodeapp ---> the Ingress will do oauth and redirect request to Nginx (which is happening fine ) the Nginx take my request and redirect me to target nodeapp microservice (which is failing at Error 400) My code snippets:

Ingress.yaml

spec:
  rules:
    - host: example.com
      http:
        paths:
          - path: /api/nodeapp
            backend:
              serviceName: nginx-internal-service
              servicePort: 80
          - path: /api/tea
            backend:
              serviceName: nginx-internal-service
              servicePort: 80

Nginx.conf

user  nginx;
worker_processes  auto;

error_log  /var/log/nginx/error.log debug;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;
    include /etc/nginx/api_gateway.conf;
    include /etc/nginx/conf.d/*.conf;
}

api_gateway.conf

include api_backends.conf;
#include api_keys.conf;

server {
    access_log /var/log/nginx/api_access.log main; # Each API may also log to a separate file

    listen 80; # TLS config goes here (for production use)
    server_name example.com;

    # TLS config
    #ssl_certificate      /etc/ssl/certs/api.example.com.crt;
    #ssl_certificate_key  /etc/ssl/private/api.example.com.key;
    #ssl_session_cache    shared:SSL:10m;
    #ssl_session_timeout  5m;
    #ssl_ciphers          HIGH:!aNULL:!MD5;
    #ssl_protocols        TLSv1.2 TLSv1.3;
   # Invalid resource
    location / {
        rewrite ^ https://$host$request_uri permanent;
    }
    # API definitions, one per file
    include api_conf.d/*.conf;

    # Error responses
    error_page 404 = @400;         # Invalid paths are treated as bad requests
    location @400 {
        return 400 '{"status":400,"message":"Bad request"}\n';
    }
    proxy_intercept_errors on;     # Do not send backend errors to the client
    include errors_json.conf;  # API client friendly JSON error responses
    default_type application/json; # If no content-type then assume JSON
}

nodeapi_simple.conf

# Node API
#
location /api/ {
    # Policy configuration here (authentication, rate limiting, logging, more...)
    #
    access_log /var/log/nginx/nodeapp_api.log main;

    # URI routing
    #
    location /api/tea {
        proxy_pass http://tea;
    }

    location /api/nodeapp {
        proxy_pass http://nodeapp;
    }

    return 404; # Catch-all
}

# vim: syntax=nginx

api_backend.conf

upstream nodeapp {
    zone nodeapp 64k;
    server nodeapp IP:8000;
    
    
}


upstream tea {
    zone tea 64k;
    server Tea app IP:80;
    
    
}



# vim: syntax=nginx

My main focus here is to run the example.com/api/nodeapp to run which is not working though I have already tested nodeapp on localhost its running fine. Also strange thing is this tea app is a just a sample text based app which is working as I hit in the browser with URL example.com/api/tea its working a[[1]: https://i.stack.imgur.com/3fP3k.png][1]s per below snap:

Here are my logs [1]: https://i.stack.imgur.com/jssnb.png][1] I been stuck on this error since 3 days hence requesting everyone to help me out on this at their earliest conveniences