Diagnose BlueMap mixed-content errors behind an HTTPS map address
An HTTPS map page can still request resources through HTTP if its public and internal addresses are confused. Browsers may block those requests and leave an empty map. Diagnose the failing URL before opening extra ports or changing the Minecraft server’s network rules.
Work through the change
- Open browser developer tools on the public map address and record a failed request and its console message. Remove session tokens from any screenshot before sharing it with support.
- Compare the public HTTPS hostname with the internal BlueMap web service and the reverse proxy’s documented upstream. Keep the internal service private where the existing design requires it; do not expose it merely to bypass the proxy.
- Read BlueMap’s reverse-proxy guidance for your web server. Check path handling and forwarded request settings against the actual deployment, then back up and validate the proxy configuration before applying a targeted correction.
- Reopen the public URL in a fresh session and inspect both page assets and map-data requests. Test a deep map link too, since a working homepage can hide an incorrect subpath rule.
Check the result
The public page should load map resources through the intended secure origin without mixed-content blocks. Check the certificate and HTTP response status for the actual failed request. A browser success on a local HTTP address does not establish that the public reverse-proxy path is correct.
Test another map page after correcting a proxy rule. Shared host configuration can affect unrelated views even when the originally failing URL now responds correctly.
Recover or stop safely
Restore the previous validated proxy configuration if unrelated pages fail after the change. Preserve the failing URL and logs so the next adjustment remains targeted. Do not disable browser security or publish internal credentials as a workaround for a map address mismatch.
Related guidance and maintainer reference
For the broader setup, read Set up a BlueMap web map and control rendering load. Check the installed plugin version before applying syntax from the official BlueMap documentation.