如何阻止HttpClient发送请求时生成新行？

Question

我正在创建一个Messenger应用程序，当前在客户端上运行，并且我已经对大多数API（服务器端）进行了编程。

我正在尝试向服务器发送POST请求，但是它将\r\n放在数据包的每个元素之后（例如：-，content-type header = application/json\r\n）

这意味着当我的服务器尝试验证传入流量是否为JSON格式时，它会将其丢弃。

我已经使用WireShark来查看数据包的外观，这是屏幕截图：

我用来发送请求的代码：

using Newtonsoft.Json;
using System.Net.Http;

public async static Task<HttpResponseMessage> PostRequestAsync(string path, object data)
    {
        var request = new HttpRequestMessage
        {
            RequestUri = new Uri(Main.ServerAddress + ":" + Main.ServerPort.ToString() + path),
            Method = HttpMethod.Post,

        };


        MessageBox.Show("Content: " + JsonConvert.SerializeObject(data));




        request.Content = new StringContent(JsonConvert.SerializeObject(data));
        request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
        MessageBox.Show(request.ToString());
        var response = new HttpResponseMessage();
        using (HttpClient client = new HttpClient())
        {
            response = await client.SendAsync(request);

        }

        return response;
    }

被序列化为json的对象/已发送到服务器：

public class UserCreds{
    public string username;
    public string password;
}

谢谢。

编辑

这是服务器代码：

@server.route("/1/signup", methods=["POST"]) # Sign up a user.
def sign_up_user():
    if request.is_json == False:
        return make_response(), 400

userJson = request.get_json()

uName = userJson['username']
pWord = userJson['password']

#try:
file = open(userCredsFile, 'r')
fileRaw = file.read()

creds = {}
if fileRaw != "":
    creds = json.loads(fileRaw)

if uName in creds:
    return create_status_response("User already exists.")

else:
    creds[uName] = pWord

file.close()

file = open(userCredsFile, 'w')

file.write(json.dumps(creds))

file.close();

return make_response(), 201

#except e:
#    return create_status_response("Something happened.")