pgAdmin 6.15 does not work with nginx reverse proxy

01-pgadmin-6.15-not-working-with-nginx.md

pgAdmin 6.15 does not work with nginx reverse proxy

Example to reproduce the issue at pgadmin-org/pgadmin4#5507

Download this git and run docker-compose up --build -d
When opening http://localhost:8080/pgadmin4/browser/ you can see, that not all requests from the javascript are going to /pgadmin

docker-compose.yml

services:
  nginx:
    build: .
    ports:
      - 8080:80

  pgadmin:
    image: dpage/pgadmin4:6.15
    environment:
      PGADMIN_DEFAULT_EMAIL: "no-reply@example.com"
      PGADMIN_DEFAULT_PASSWORD: "secret"
      PGADMIN_LISTEN_PORT: "5050"
      PGADMIN_SERVER_JSON_FILE: "/data/servers.json"
      PGADMIN_CONFIG_MASTER_PASSWORD_REQUIRED: "False"
      PGADMIN_CONFIG_SERVER_MODE: "False"
      SCRIPT_NAME: "/pgadmin4"
    volumes:
      - ./servers.json:/data/servers.json:ro

  postgres:
    image: postgres:13.2
    environment:
      POSTGRES_PASSWORD: postgres
      POSTGRES_DB: mydb

Dockerfile

FROM nginx:1.22.1-alpine
COPY nginx.conf /etc/nginx/conf.d/default.conf

nginx.conf

server {
  listen 80;
  listen  [::]:80;
  server_name localhost;

  location /pgadmin4 {
    proxy_set_header X-Script-Name /pgadmin4;
    proxy_set_header X-Scheme $scheme;
    proxy_set_header Host $host;
    proxy_pass http://pgadmin:5050;
    proxy_redirect off;
  }
}

servers.json

{
  "Servers": {
    "1": {
      "Name": "Admin",
      "Group": "Postgres",
      "Username": "postgres",
      "Host": "postgres",
      "Port": 5432,
      "SSLMode": "prefer",
      "MaintenanceDB": "postgres"
    }
  }
}