C# HttpClient ProtocolViolationException

对于一个项目，我必须使用一个API，使用GET动词，这必然需要"Content-type"属性，但这不是标准的，我想把这个属性设置为"application/json"。

我正在使用c# HttpClient，在整个宇宙中寻找后，我找不到一种方法来做到这一点。我总是有一个"ProtocolViolationException"，显然…

是否有办法使用"内容类型"answers"GET"请求与HttpClient ?

我使用这个代码

public async Task<HttpResponseMessage> GetAsync(string uri, double timeout = 0, string token = null)
    {
        using(var handler = new HttpClientHandler())
        {
            if(handler.SupportsAutomaticDecompression)
            {
                handler.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
            }
            using(var client = new HttpClient(handler))
            {
                var request = new HttpRequestMessage(HttpMethod.Get, uri);
                HttpResponseMessage httpResponseMessage = null;
                if(timeout > 0)
                {
                    client.Timeout = TimeSpan.FromSeconds(timeout);
                }
                if(!string.IsNullOrWhiteSpace(token))
                {
                    request.Headers.Add("authorization", token);
                }
                request.Content = new StringContent("");
                request.Content.Headers.Remove("Content-type");
                request.Content.Headers.Add("Content-type", "application/json");
                httpResponseMessage = await client.SendAsync(request);
                return httpResponseMessage;
            }
        }
    }

提前感谢:)