Скачать или смотреть Resolving ERR_BAD_SSL_CLIENT_AUTH_CERT in Angular with Custom Certificate Integration

Learn how to effectively handle `ERR_BAD_SSL_CLIENT_AUTH_CERT` errors in Angular by utilizing a custom SSL certificate with NGINX as a reverse proxy.
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Troubleshooting ERR_BAD_SSL_CLIENT_AUTH_CERT in Angular: A Complete Guide

In today's web development landscape, HTTPS is more important than ever, especially when dealing with secure connections to outside services. However, if you're using Angular and encounter the ERR_BAD_SSL_CLIENT_AUTH_CERT error, it can be quite perplexing. This guide will explore the root of this issue and walk you through a simple solution to ensure your Angular application can securely connect to services using a custom SSL certificate.

Understanding the Problem

You're trying to communicate with an external service using Angular 11, and while things go smoothly with Postman by adding the required .crt and .key files, your Angular application throws an error. Here’s the critical part of the error message you encounter:

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This error typically occurs when there’s a problem with the SSL client authentication, often due to the client certificate not being correctly handled by the Angular application. Since Angular runs in a browser environment, it doesn't have direct access to the certificate files you might use in backend applications or tools like Postman.

The Solution: Using NGINX as a Reverse Proxy

To resolve this issue, we can leverage NGINX as a reverse proxy. This allows you to set up SSL configurations without altering the frontend framework. Here’s how you can do it step-by-step:

Step 1: Install NGINX

If you haven't already, you will need to install NGINX on your server. You can do this using your package manager. For example, on Ubuntu, you can run:

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Step 2: Configure NGINX to Use Your Certificates

Create or edit your NGINX configuration file where you want to set up the reverse proxy. You’ll need to specify the location block to handle the requests appropriately. Here’s an example configuration to add in your NGINX config file:

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Breaking Down the Configuration:

proxy_ssl_certificate: This directive specifies the path to your SSL certificate file.

proxy_ssl_certificate_key: This specifies the path to your key file.

proxy_pass: This is where you define the URL of the external service you're connecting to.

Step 3: Test Your Configuration

After updating your NGINX configuration, make sure to test it to catch any errors:

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Ensure you get a successful message, and then restart NGINX to apply the changes:

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Step 4: Update Your Angular HTTP Request

You don’t need to modify much in your Angular application. Your RestConnectionService remains largely the same:

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Just ensure that the AppSettings.API_URL is pointed to the NGINX server that now handles the SSL certificates appropriately.

Conclusion

By configuring NGINX as a reverse proxy and directing your Angular application to communicate with it instead of directly with the external service, you can eliminate the ERR_BAD_SSL_CLIENT_AUTH_CERT issue. This approach consolidates the handling of SSL, leaving your client-side code clean and simple.

Implementing a solution like this not only helps with SSL client authentication but also provides you with added security measures and potentially improved performance through caching and load balancing.

If you have further questions or run into issues, feel free to reach out or leave a comment below!