How to add "application/x-www-form-urlencoded" as Content-type in .Net httpClient - asp.net

Question

I cannot add Content-type as "application/x-www-form-urlencoded". There is throwing an error. Only for the this content-type. Thank You for the attention.
using (var httpClient = new HttpClient())
{
var request = new HttpRequestMessage
{
Method = new HttpMethod("POST"),
RequestUri = new Uri(path),
};
request.Headers.Add("Accept", "application/json");
request.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
HttpResponseMessage response1 = await httpClient.SendAsync(request);
var token = await response1.Content.ReadAsStringAsync();
}
It's throwing error like that
"Misused header name, 'Content-Type'. Make sure request headers are
used with HttpRequestMessage, response headers with
HttpResponseMessage, and content headers with HttpContent objects."

Answer 1

The content type is a header of the content, not of the request, which is why this is failing.
One way is that you can call TryAddWithoutValidation instead of add like below:
request.Headers.TryAddWithoutValidation("Accept", "application/json");
request.Headers.TryAddWithoutValidation("Content-Type", "application/x-www-form-urlencoded");
The other way is that you can set the Content-Type when creating the request content itself, refer to this answer.

Answer 2

I'v used something more complicated but it works.
var client = new HttpClient();
//headers dictionary
var dict = new Dictionary<string, string>();
dict.Add("Content-Type", "application/x-www-form-urlencoded");
//request
var req = new HttpRequestMessage(HttpMethod.Post, new Uri(url)) { Content = new FormUrlEncodedContent(dict) };
req.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/x-www-form-urlencode"));
var response = await client.SendAsync(req);