%20 Added to Paths When Using BASE_PATH="/" in Docker Compose

[0xA1-devops]

Description

When setting BASE_PATH="/" in the Docker Compose configuration for synapse-admin, URLs are incorrectly encoded with %20, causing issues with request routing.

Example

Given the following docker-compose.yml:

services:
  synapse-admin:
    container_name: synapse-admin
    build:
      context: .
      args:
        - BASE_PATH=/
    ports:
      - "127.0.0.1:50000:80"
    restart: unless-stopped

Requests through an external proxy (e.g., Nginx) such as:

http://your-domain/synapse-admin/

may result in URLs like:

http://127.0.0.1:50000/%20/synapse-admin/assets/index.js

Suggested Fix

Change BASE_PATH="/" to BASE_PATH=/ in the docker-compose.yml file to avoid encoding issues:

args:
  - BASE_PATH=/

Environment

• Image: awesometechnologies/synapse-admin:latest
• Deployment Method: Docker Compose
• Reverse Proxy: Nginx
• Build Source: master (9fc0050)
• Docker version: 20.10.24+dfsg1
• docker-compose version: 1.29.2