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Learn how to configure `Webflux`'s OAuth2 client with HTTP proxy support in Spring Boot, ensuring secure and efficient integration with external systems.
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This video is based on the question https://stackoverflow.com/q/58582112/ asked by the user 'Weso' ( https://stackoverflow.com/u/8045260/ ) and on the answer https://stackoverflow.com/a/67636344/ provided by the user 'Jocker' ( https://stackoverflow.com/u/2190096/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Setting Up Webflux with OAuth2 Client Behind an HTTP Proxy in Spring Boot

In today’s cloud-based world, integrating applications securely is essential, especially when dealing with external APIs or services. A common challenge developers face is configuring OAuth2 clients behind an HTTP proxy in Spring Boot applications using Webflux. This guide will guide you through the nuances of setting this up effectively, ensuring your OAuth2 client operates smoothly behind a proxy.

Understanding the Challenge

When trying to set up an OAuth2 client with Webflux, you may encounter an issue where the OAuth2 client is not properly configured to work with your chosen HTTP proxy. Specifically, the ServerOAuth2AuthorizedClientExchangeFilterFunction can create new instances of WebClient that lack the appropriate proxy configuration. This is a frustrating scenario for developers looking to connect to external systems securely.

Solution Overview

After some exploration and community input, I've discovered an effective approach to configure your proxy settings smoothly. Below, I will break this solution down into manageable sections.

Step 1: Create a Proxy HTTP Client

To start, we need to create a helper function that configures the HTTP client with the proxy settings using JVM parameters:

[[See Video to Reveal this Text or Code Snippet]]

Key Points:

The method checks for proxy host and port. If not set, it defaults to a basic HttpClient.

If the proxy is specified, it configures the client to use HTTP proxy settings.

Step 2: Configuring the OAuth2 Client with Proxy Support

Next, we need to create and configure the OAuth2 client. This setup involves updating the ReactiveOAuth2AuthorizedClientManager to utilize the WebClient configured with our proxy parameters.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Implementing the Configuration Function

Finally, we will implement a function to set the web client with our proxy settings in the ReactiveOAuth2AccessTokenResponseClient and update the authorized client provider accordingly:

[[See Video to Reveal this Text or Code Snippet]]

Final Thoughts

By following these steps, you can effectively set up a Webflux-based OAuth2 client that operates behind an HTTP proxy, ensuring that your application remains secure and compliant while accessing external resources.

I hope this configuration guide proves helpful to developers facing similar proxy-related challenges in Spring Boot with Webflux. Happy coding!