C#访问WPS开放平台接口时，有WPS3签名的接口失败原因，请求帮助。

var request = new HttpRequestMessage();

request.Method = HttpMethod.Get;

request.RequestUri = new Uri("https://openapi.wps.cn/kopen/kdocs/api/v1/app/folder/url?access_token=*******");

var date = DateTimeOffset.UtcNow;

var md5 = "d41d8cd98f00b204e9800998ecf8427e";

request.Headers.TryAddWithoutValidation("Date",date.ToString("R"));

request.Headers.TryAddWithoutValidation("Content-Md5", md5);

var signatureData = "*****" + md5 +"/kopen/kdocs/api/v1/app/folder/url?access_token=*******" +"application/json" +date.ToString("R");

using var sha1 = SHA1.Create();

var signatureBytes = sha1.ComputeHash(Encoding.UTF8.GetBytes(signatureData));

var signature = BitConverter.ToString(signatureBytes).Replace("-", "").ToLower();

// 生成 X-Auth

var XAuth= $"WPS-3:********:{signature}";

request.Headers.TryAddWithoutValidation("X-Auth", XAuth);

HttpResponseMessage response = await _httpClient.SendAsync(request);

var responseContent = await response.Content.ReadAsStringAsync();

await response.Content.CopyToAsync(context.Response.Body);