Mixed HTTP/HTTPS Content on Replit
Browser shows mixed content warning or blocks insecure resources. Deployed app mixes secure HTTPS with insecure HTTP requests.
Modern browsers block HTTP content loaded from HTTPS pages.
Error Messages You Might See
Common Causes
- Hardcoded http:// URLs in templates instead of https://
- External resources (CDN, API) using HTTP
- WebSocket using ws:// instead of wss://
- Relative URLs containing scheme
How to Fix It
Use relative URLs when possible: /api/endpoint instead of https://domain.com/api. Always use https:// for external resources and wss:// for WebSocket on HTTPS sites. Use Thymeleaf @{} for relative URLs. Check browser console (F12) for mixed content warnings. Force HTTPS with server.http2.enabled=true and redirect http to https.
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Get HelpFrequently Asked Questions
Should I use absolute or relative URLs?
Relative URLs (/path) when possible. Absolute URLs only for external domains
What about external CDNs?
Ensure CDN supports HTTPS. Most modern CDNs use HTTPS by default