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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.

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. Jaime Orts-Caroff Jaime Orts-Caroff I'm a Senior Android developer, open to work in various fields 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: šŸš€ Leadership: Managing and coaching teams of 15+ engineers, fostering a culture of accountability and continuous improvement. šŸ—ļø Architecture: Enterprise Core Systems, Multi-system Integration (ERP/API/ETL), and Core Database Structure. ā˜ļø Cloud & Scale: AWS Expert; architected systems handling 10B+ monthly requests and managing 100k+ SKUs. šŸ“ˆ 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. 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. Dor Yaloz Dor Yaloz SW engineer with 6+ years of experience, I worked with React/Node/Python did projects with React+Capacitor.js for ios Supabase expert Jen Jacobsen Jen Jacobsen I’m a Full-Stack Developer with over 10 years of experience building modern web and mobile applications. I enjoy working across the full product lifecycle — turning ideas into real, well-built products that are intuitive for users and scalable for businesses. I particularly enjoy building mobile apps, modern web platforms, and solving complex technical problems in a way that keeps systems clean, reliable, and easy to maintain. 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. Victor Denisov Victor Denisov Developer Matt Butler Matt Butler Software Engineer @ AWS Omar Faruk Omar Faruk As a Product Engineer at Klasio, I contributed to end-to-end product development, focusing on scalability, performance, and user experience. My work spanned building and refining core features, developing dynamic website templates, integrating secure and reliable payment gateways, and optimizing the overall system architecture. I played a key role in creating a scalable and maintainable platform to support educators and learners globally. I'm enthusiastic about embracing new challenges and making meaningful contributions.

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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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