You can use the following piece of code to test this:

var client = new HttpClient();
client.DefaultRequestHeaders.Add("No-value", "");
client.DefaultRequestHeaders.Add("With-value", "value");

await client.GetAsync("http://www.google.com");

Then on linux, the header No-value is not sent. This breaks things such as the AWS SDK on linux due to the request's signature not matching, plus, it is different to the behaviour on windows