private static async Task <HttpResponse> MakeExternalRequestAsync(ITraceable trace, string method, Uri uri, Func <Stream, Task> writeBody, IHeaders headers)
{
try
{
var request = (HttpWebRequest)WebRequest.Create(uri);
request.AllowAutoRedirect = false;
request.Method = method;
foreach (var(key, value) in headers.Where(pair => pair.Key != "Content-Type" && pair.Key != "Accept"))
{
request.Headers[key] = value;
}
if (headers.ContentType != null)
{
request.ContentType = headers.ContentType.ToString();
}
if (headers.Accept != null)
{
request.Accept = headers.Accept.ToString();
}
if (writeBody != null)
{
var requestStream = await request.GetRequestStreamAsync().ConfigureAwait(false);
#if NETSTANDARD2_1
await using (requestStream)
#else
using (requestStream)
#endif
{
await writeBody(requestStream).ConfigureAwait(false);
}
}
var webResponse = (HttpWebResponse)await request.GetResponseAsync().ConfigureAwait(false);
var respLoc = webResponse.Headers["Location"];
if (webResponse.StatusCode == HttpStatusCode.MovedPermanently && respLoc != null)
{
return(await MakeExternalRequestAsync(trace, method, new Uri(respLoc), writeBody, headers).ConfigureAwait(false));
}
return(new HttpResponse(trace, webResponse));
}
catch (WebException we)
{
if (we.Response is not HttpWebResponse response)
{
return(null);
}
var _response = new HttpResponse(trace, response.StatusCode, response.StatusDescription);
foreach (var header in response.Headers.AllKeys)
{
_response.Headers[header] = response.Headers[header];
}
return(_response);
}
catch (Exception e)
{
return(new HttpResponse(trace, HttpStatusCode.InternalServerError, e.Message));
}
}