从HttpClient响应中删除标头

Question

使用HttpClient时遇到问题。 通话正常，我可以接听电话，但无法正确接收内容。

我编写的函数如下所示：

    public async Task<string> MakePostRequestAsync(string url, string data, CancellationToken cancel)
    {
        String res = String.Empty;

        using (HttpClient httpClient = new HttpClient())
        {
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;

            HttpContent content = new StringContent(data, Encoding.UTF8, "application/xml");
            httpClient.DefaultRequestHeaders.Authorization = getHeaders();
            httpClient.DefaultRequestHeaders.Add("Accept", "application/xml");
            httpClient.DefaultRequestHeaders.Add("User-Agent", "C#-AppNSP");
            httpClient.DefaultRequestHeaders.ExpectContinue = false;

            HttpResponseMessage response = await httpClient.PostAsync(url, content, cancel);
            response.EnsureSuccessStatusCode(); // Lanza excepción si no hay éxito

            res = await response.Content.ReadAsStringAsync();
            if (String.IsNullOrEmpty(res))
            {
                throw new Exception("Error: " + response.StatusCode);
            }
        }

        return res;
    }

我得到的响应字符串与此类似：

HTTP/1.1 0 nullContent-Type: application/xml;charset=UTF-8
Content-Length: 1263
Date: Tue, 02 Jul 2019 07:48:07 GMT
Connection: close

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<SeguimientoEnviosFechasResponse xsi:noNamespaceSchemaLocation="SeguimientoEnviosFechasResponse.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <Error>0</Error>
    <MensajeError></MensajeError>
    <SeguimientoEnvioFecha>
        <!-- more XML here -->
    </SeguimientoEnvioFecha>
</SeguimientoEnviosFechasResponse>

由于某些原因，此字符串包含标头，因此当我尝试反序列化它时，会出现错误。

如何在响应字符串中删除此标头？

Answer 1

您的服务器在响应正文中返回标头。 最好在服务器端修复此问题，如果不可能，则应从响应中提取主体：

        var xml = res.Substring(res.IndexOf("<?xml", StringComparison.Ordinal));

Answer 2

您可以尝试以下方法：

using (var receiveStream = response.GetResponseStream()) 
{
  using (var readStream = new StreamReader(receiveStream, Encoding.UTF8)) 
  {
    Console.WriteLine (readStream.ReadToEnd ());
  }
}