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Discover how to configure NextJS, Strapi, and Auth0 on localhost without encountering `ERR_SSL_PROTOCOL_ERROR` errors. Learn essential tips for seamless development!
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How to Solve the ERR_SSL_PROTOCOL_ERROR with NextJS, Strapi, and Auth0 in Localhost Development

When developing a web application, integrating various technologies is often inevitable. In the case of using NextJS as the frontend, Strapi as the backend, and Auth0 as your identity provider, you might encounter the dreaded ERR_SSL_PROTOCOL_ERROR. This error can be particularly frustrating, especially when everything appears to be configured correctly. In this guide, we’ll explore this problem and walk through the solutions step-by-step.

Understanding the Problem

The ERR_SSL_PROTOCOL_ERROR typically occurs when there is a problem with the SSL protocol being used for a connection. This issue arises often in local development environments, particularly when relying on HTTPS. For instance, if you're attempting to authenticate through Auth0 and receive this error, it could indicate misconfigurations in your server or reverse proxy settings.

You might encounter situations where:

Strapi is configured to use Auth0 correctly.

You’re accessing the Auth0 login screen, but once you submit credentials you hit the ERR_SSL_PROTOCOL_ERROR.

In this context, we will focus on ensuring a smooth development experience without these SSL issues.

Solution: Configuring Your Development Environment

Here are several methods to resolve the ERR_SSL_PROTOCOL_ERROR when developing your web application locally with NextJS, Strapi, and Auth0.

1. Go Without HTTPS in Development

Recommended Approach: The simple way is to avoid using HTTPS during the development phase. This approach removes the concern for SSL altogether. Ensure your configuration allows HTTP without SSL complications.

Caddyfile Configuration without HTTPS

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This Caddyfile setup enables direct HTTP access, proxying from port 8080 to Strapi running on port 1337.

2. Enable HTTPS in Development

If you prefer to develop with HTTPS, you can adjust your Caddy settings to include TLS support. Do note, however, that using tls internal is suitable only for development and won’t work in production.

Caddyfile Configuration with HTTPS

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This configuration will allow HTTPS connections while still running the backend on HTTP.

3. Preparing for Production

Once you transition from development to a production environment, removing any unsecure configurations is crucial. Here’s how you should set up your Caddyfile for production use:

Production Caddyfile Configuration

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In production, allow Caddy to manage your SSL certificates effectively, ensuring a smooth, secure user experience.

Additional Notes

Environment Variables: Make sure to set your environment variables correctly in Strapi, particularly for the host, port, and URL settings.

Auth0 Callback URLs: Don’t forget to update your Auth0 application settings to reflect any changes to your callback URLs. This is critical for redirect functionality post-authentication.

Conclusion

Integrating NextJS, Strapi, and Auth0 offers a rich experience for developing modern web applications. By understanding and configuring your local environment according to the outlined steps, you can effectively avoid the ERR_SSL_PROTOCOL_ERROR and focus more on building great features rather than troubleshooting SSL settings.

Happy coding!