net::ERR_BLOCKED_BY_CLIENT
A browser extension (ad blocker, privacy tool) blocked the request.
Seen on:
JavaScript
Meaning
URLs containing words like ads, analytics, track, banner or affiliate are blocked by filter lists. Your own endpoints can be caught too.
Common causes
- Ad blocker filter matching the URL
- Privacy extension blocking trackers/analytics
- Your API path contains “ads”/“analytics”
⚡ Quick fix
- Test in a private window without extensions
- Rename endpoints that look like ad/tracking URLs
- Don’t rely on third-party scripts for critical features
Detailed fix by platform
JavaScript
- Serve analytics via first-party paths that don’t match common filter rules
How to diagnose
- Extension — Does it work with extensions disabled?
- URL — Does it contain ad/track keywords?
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Last updated 2 Oct 2026