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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

Mixed Content: The page at 'https://...' was loaded over HTTPS, but requested an insecure resource
Mixed Content: The page at 'https://...' was loaded over HTTPS, but requested an insecure resource

Common Causes

  1. Hardcoded http:// URLs in templates instead of https://
  2. External resources (CDN, API) using HTTP
  3. WebSocket using ws:// instead of wss://
  4. 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.

Real developers can help you.

Stanislav Prigodich Stanislav Prigodich 15+ years building iOS and web apps at startups and enterprise companies. I want to use that experience to help builders ship real products - when something breaks, I'm here to fix it. Simon A. Simon A. I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows. Franck Plazanet Franck Plazanet I am a Strategic Engineering Leader with over 8 years of experience building high-availability enterprise systems and scaling high-performing technical teams. My focus is on bridging the gap between complex technology and business growth. Core Expertise: 🚀 Leadership: Managing and coaching teams of 15+ engineers, fostering a culture of accountability and continuous improvement. 🏗️ Architecture: Enterprise Core Systems, Multi-system Integration (ERP/API/ETL), and Core Database Structure. ☁️ Cloud & Scale: AWS Expert; architected systems handling 10B+ monthly requests and managing 100k+ SKUs. 📈 Business Impact: Aligning tech strategy with P&L goals to drive $70k+ in monthly recurring revenue. I thrive on "out-of-the-box" thinking to solve complex technical bottlenecks and am always looking for ways to use automation to improve business productivity. Tejas Chokhawala Tejas Chokhawala Full-stack engineer with 5 years experience building production web apps using React, Next.js and TypeScript. Focused on performance, clean architecture and shipping fast. Experienced with Supabase/Postgres backends, Stripe billing, and building AI-assisted developer tools. Richard McSorley Richard McSorley Full-Stack Software Engineer with 8+ years building high-performance applications for enterprise clients. Shipped production systems at Walmart (4,000+ stores), Cigna (20M+ users), and Arkansas Blue Cross. 5 patents in retail/supply chain tech. Currently focused on AI integrations, automation tools, and TypeScript-first architectures. MFox MFox Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking. Meïr Ankri Meïr Ankri Full-stack developer specializing in React / Next.js / Node.js with 6+ years of experience. I've worked across various sectors including automotive (Reezocar/Société Générale), healthcare (Medical Link SaaS), and e-commerce (Glasman). I build web apps end-to-end, from architecture to production, with a focus on scalability, performance, and code quality. I also mentor junior developers and contribute to technical decisions and code reviews. Anthony Akpan Anthony Akpan Developer with 8 years of experience building softwares fro startups Pratik Pratik SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure BurnHavoc BurnHavoc Been around fixing other peoples code for 20 years.

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Frequently 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

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