private static ulong CurlReceiveHeadersCallback(IntPtr buffer, ulong size, ulong nitems, IntPtr context)
{
CurlHandler.VerboseTrace("size: " + size + ", nitems: " + nitems);
size *= nitems;
if (size == 0)
{
return(0);
}
EasyRequest easy;
if (TryGetEasyRequestFromContext(context, out easy))
{
try
{
// The callback is invoked once per header; multi-line headers get merged into a single line.
string responseHeader = Marshal.PtrToStringAnsi(buffer).Trim();
HttpResponseMessage response = easy._responseMessage;
if (!TryParseStatusLine(response, responseHeader, easy))
{
int index = 0;
string headerName = CurlResponseParseUtils.ReadHeaderName(responseHeader, out index);
if (headerName != null)
{
string headerValue = responseHeader.Substring(index).Trim();
if (!response.Headers.TryAddWithoutValidation(headerName, headerValue))
{
response.Content.Headers.TryAddWithoutValidation(headerName, headerValue);
}
else if (easy._isRedirect && string.Equals(headerName, HttpKnownHeaderNames.Location, StringComparison.OrdinalIgnoreCase))
{
HandleRedirectLocationHeader(easy, headerValue);
}
else if (string.Equals(headerName, HttpKnownHeaderNames.SetCookie, StringComparison.OrdinalIgnoreCase))
{
easy._handler.AddResponseCookies(easy, headerValue);
}
}
}
return(size);
}
catch (Exception ex)
{
easy.FailRequest(ex); // cleanup will be handled by main processing loop
}
}
// Returing a value other than size fails the callback and forces
// request completion with an error
return(size - 1);
}
private static bool TryParseStatusLine(HttpResponseMessage response, string responseHeader, EasyRequest state)
{
if (!responseHeader.StartsWith(CurlResponseParseUtils.HttpPrefix, StringComparison.OrdinalIgnoreCase))
{
return(false);
}
// Clear the header if status line is recieved again. This signifies that there are multiple response headers (like in redirection).
response.Headers.Clear();
response.Content.Headers.Clear();
CurlResponseParseUtils.ReadStatusLine(response, responseHeader);
state._isRedirect = state._handler.AutomaticRedirection &&
(response.StatusCode == HttpStatusCode.Redirect ||
response.StatusCode == HttpStatusCode.RedirectKeepVerb ||
response.StatusCode == HttpStatusCode.RedirectMethod);
return(true);
}