Self-Contained Export to PDF Fails with 500 Error

[alex98RB]

I'm running a self-contained drawio docker image and self-contained export-server image.
The export to pdf is not working, i'm receiving a internal server error from export-server container. The connection from the drawio to the export-server works because we can see in the logs that he gets it with the correct url.

Here the error log of the export-server:

::ffff:10.128.4.1 - - [04/Jul/2025:12:26:30 +0000] "POST / HTTP/1.1" 500 - "https://diagrams-test.domain.com/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36"
::ffff:10.128.4.1 - - [04/Jul/2025:12:26:30 +0000] "GET /favicon.ico HTTP/1.1" 400 - "https://diagrams-export-server-test.domain.com/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36"
warn: Handled exception: Could not find Chrome (ver. 138.0.7204.49). This can occur if either

1. you did not perform an installation before running the script (e.g. npx puppeteer browsers install chrome) or
2. your cache path is incorrectly configured (which is: /.cache/puppeteer).
   For (2), check out our guide on configuring puppeteer at https://pptr.dev/guides/configuration. req=ip=10.8.39.41 format=pdf w=0 h=0 s=1 bg=%23ffffff {"stack":"Error: Could not find Chrome (ver. 138.0.7204.49). This can occur if either\n 1. you did not perform an installation before running the script (e.g. npx puppeteer browsers install chrome) or\n 2. your cache path is incorrectly configured (which is: /.cache/puppeteer).\nFor (2), check out our guide on configuring puppeteer at https://pptr.dev/guides/configuration.\n at ChromeLauncher.resolveExecutablePath (/home/pptruser/draw-image-export2/node_modules/puppeteer-core/lib/cjs/puppeteer/node/BrowserLauncher.js:308:27)\n at ChromeLauncher.computeLaunchArguments (/home/pptruser/draw-image-export2/node_modules/puppeteer-core/lib/cjs/puppeteer/node/ChromeLauncher.js:93:24)\n at ChromeLauncher.launch (/home/pptruser/draw-image-export2/node_modules/puppeteer-core/lib/cjs/puppeteer/node/BrowserLauncher.js:84:39)\n at ChromeLauncher.launch (/home/pptruser/draw-image-export2/node_modules/puppeteer-core/lib/cjs/puppeteer/node/ChromeLauncher.js:45:22)\n at PuppeteerNode.launch (/home/pptruser/draw-image-export2/node_modules/puppeteer-core/lib/cjs/puppeteer/node/PuppeteerNode.js:143:31)\n at handleRequest (/home/pptruser/draw-image-export2/export.js:473:33)\n at Layer.handleRequest (/home/pptruser/draw-image-export2/node_modules/router/lib/layer.js:152:17)\n at next (/home/pptruser/draw-image-export2/node_modules/router/lib/route.js:157:13)\n at Route.dispatch (/home/pptruser/draw-image-export2/node_modules/router/lib/route.js:117:3)\n at handle (/home/pptruser/draw-image-export2/node_modules/router/index.js:435:11)"}

I don't know what could be missing, is smth wrong with the jgraph/export-server image or am I missing an environment?
Here are the environments I'm using.

Env Drawio:

• DRAWIO_BASE_URL: https://diagrams-test.domain.lu/draw/
• DRAWIO_SERVER_URL: https://diagrams-test.domain.lu/draw/
• EXPORT_URL: https://diagrams-export-server--test.domain.lu/

Env export-server:

• DRAWIO_BASE_URL: https://diagrams-test.domain.lu

Thanks,

[meequrox]

services:
  app:
    image: jgraph/drawio:latest
    restart: unless-stopped
    ports:
      - "8111:8080"
    environment:
        LETS_ENCRYPT_ENABLED: "false"
        KEYSTORE_PASS: "mykeystorepass"
        DRAWIO_SELF_CONTAINED: "true"
        DRAWIO_SERVER_URL: "https://drawio.mysite.su/"
        DRAWIO_BASE_URL: "https://drawio.mysite.su/"
        EXPORT_URL: "https://drawio-exporter.mysite.su/"
    healthcheck:
      test: ["CMD-SHELL", "curl -f http://domain:8080 || exit 1"]
      interval: 1m30s
      timeout: 10s
      retries: 5
      start_period: 10s

  exporter:
    image: jgraph/export-server:latest
    ports:
      - "8112:8000"
    volumes:
      - ./fonts:/usr/share/fonts/drawio
    environment:
        DRAWIO_BASE_URL: "https://drawio.mysite.su/"

This docker-compose.yaml works. The reverse proxy forwards drawio.mysite.su requests to port 8111 and drawio-exporter.mysite.su requests to 8112. The PDF export works correctly.