C# HttpClient / HttpRequestMessage adding white spaces to headers

Code
var client = new HttpClient(new HttpClientHandler() { UseCookies = false,

           AllowAutoRedirect = false,

           Proxy = new WebProxy("localhost:8888") });



var httpReq = new HttpRequestMessage(HttpMethod.Get, $"myurl");





           httpReq.Headers.TryAddWithoutValidation("Host", "myurl");

           httpReq.Headers.TryAddWithoutValidation("Connection", "keep-alive");

           httpReq.Headers.TryAddWithoutValidation("Cookie", $"cookie");

           httpReq.Headers.TryAddWithoutValidation("Upgrade-Insecure-Requests", "1");

           httpReq.Headers.TryAddWithoutValidation("User-Agent", Data.user_agent);

           httpReq.Headers.TryAddWithoutValidation("Accept-Encoding", "gzip, deflate, br");

           httpReq.Headers.TryAddWithoutValidation("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3");

           httpReq.Headers.TryAddWithoutValidation("Referer", Data.homeUrl);

           httpReq.Headers.TryAddWithoutValidation("Accept-Language", "en-US,en;q=0.9,ar;q=0.8,und;q=0.7");



           req = await client.SendAsync(httpReq);