Steeltoe | Steeltoe .NET Core Components : CircuitBreaker | Microservice library

Steeltoe does provide a configuration provider for Spring Cloud Config Server that will allow you to map configuration values from any supported file format into key-value pairs, and there are several strategies for layering multiple configuration files but I don't think there would be any support for .html files.

If you're looking for a way to use version-controlled templates, why not read from a git repo directly rather than putting config server in the middle?

There's a few ways to add a custom message handler with Flurl (such as with a custom factory), but since you're already using IHttpClientFactory, I think the easiest path to get what you want (and the one I'd recommend) is to continue injecting HttpClient into your services as you're doing and wrap them with Flurl inside the service:

The name of that Steeltoe package changed in 3.0, you'll be needing Steeltoe.Connector.EFCore going forward.

The name of that particular type inside Npgsql.EntityFrameworkCore.PostgreSQL changed in 5.0, so that's what is preventing Steeltoe from finding it. The fix has also been applied to the 2.x branch and is included in version 2.5.3.

Check the Steeltoe Samples repo for both 2.x and 3.x versions

I'm unclear which direction traffic is flowing in your scenario, but I think you're saying the .NET application is trying to call the Java application. The code you're using is from before HttpClientFactory was introduced and is a bit clunkier than what's possible now in general. Steeltoe can be used with HttpClientFactory for a better overall experience.

Steeltoe has debug logging available to confirm the results of service lookup if you set logging:loglevel:Steeltoe.Common.Discovery = true in your application config.

You didn't mention specifically what isn't working, but I'm guessing you're getting a 404 since it looks like your code will create a request path looking like https://fortuneService/api/fortunes/random/api/v1/classes

If you're looking for something like Feign in .NET, you could try out DHaven.Faux

Steeltoe largely relies on Config Server's logic for finding the backing files by specifying the app name, environment name and additional labels. Because of the way .NET configuration is flattened into a dictionary, you won't see this reflected later in your application, but if config values are missing that you're hoping to see it may be due to the file names not matching the expected conventions.

Using AddConfigServer("external") will result in a request for "my-service-external.properties". Due to the dash being used in the convention for separating the app name from environment (or profile) name you might not want to use it in your app name.

Additionally, there have been a few releases of Steeltoe since 2.2.0, I'd suggest using the latest GA release available (currently 2.4.3)

You should recreate your docker file,

There is a FROM keyword in your docker file that shows your container should start with which image.