Streaming JSON Objects (NDJSON) With HttpClient

My first post on working with NDJSON stream in .NET was a result of a use case I needed to satisfy in one of the projects I'm involved with (and it worked great). As a result, I've received some questions on this subject. I've already answered the most common one on this blog, but there were a couple more that were really frequent. So I've decided I'm going to add a few more posts to this series:

• Fetch API, Streams API, NDJSON, and ASP.NET Core MVC
• Consuming JSON Objects Stream (NDJSON) With HttpClient
• Streaming JSON Objects (NDJSON) With HttpClient
• Receiving JSON Objects Stream (NDJSON) in ASP.NET Core MVC

Streaming NDJSON With HttpClient

When I was writing my first post about NDJSON, I didn't know there were services out there using it as an input format. The fact is that they do, which creates a need for a way to stream NDJSON with HttpClient. The natural expectation is to be able to POST an async stream, preferably with simple and elegant code.

async IAsyncEnumerable<WeatherForecast> streamWeatherForecastsAsync()
{
    for (int daysFromToday = 1; daysFromToday <= 10; daysFromToday++)
    {
        WeatherForecast weatherForecast = await GetWeatherForecastAsync(daysFromToday).ConfigureAwait(false);

        yield return weatherForecast;
    };
};

using HttpClient httpClient = new();

using HttpResponseMessage response = await httpClient.PostAsync("...",
    new NdjsonAsyncEnumerableContent<WeatherForecast>(streamWeatherForecastsAsync())
    ).ConfigureAwait(false);

response.EnsureSuccessStatusCode();

The way to achieve the elegancy in the above snippet is through the custom implemen