JavaScript SDK asset download fails from CDN

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availabilityUpdated Feb 16, 2026(via Exa)

Sources

Troubleshooting | getsentry/self-hosted | DeepWikideepwiki.com

Technologies:

NGINXSymptoms of this issue are visible in NGINX metrics and logs

How to detect:

When SETUP_JS_SDK_ASSETS=1, installation downloads JS SDK bundles from browser.sentry-cdn.com. Failures occur due to: network connectivity issues (curl timeout), CDN unavailable (404/503 responses), incorrect file permissions preventing Nginx from serving files, or volume full errors.

Recommended action:

Verify with 'ls -la sentry/nginx-cache/' to check files downloaded. Check firewall and proxy settings for CDN access. Retry later if CDN unavailable, or disable feature by unsetting SETUP_JS_SDK_ASSETS. Script automatically sets permissions to 755 for directories and 644 for files.