Remove headers from HttpClient response

Question

I'm facing a problem when using HttpClient. The call works right and I get an answer but I can't get the content properly.

The function I wrote looks like this:

    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;
    }

The response string I get is similar to this one:

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>

This string includes headers for some reason, so when I try to deserialize it I get an error.

How can I remove this headers in the response string?

Answer 1

Your server returns headers in the response body. Would be good to fix this on a server side, if it's not possible you should extract body from the response:

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