static public async Task<Request> Create(Uri uri, string method, Stream content, IDictionary<string, string> headers, TimeSpan? timeout)
{
if (string.IsNullOrWhiteSpace(method)) method = "GET";
var req = new Request
{
Uri = uri,
Headers = new Dictionary<string, string>(StringComparer.CurrentCultureIgnoreCase), //InvariantCultureIgnoreCase
Timeout = timeout,
Method = method,
Content = new MemoryStream()
};
if (headers != null)
{
foreach (var h in headers)
req.Headers.Add(h.Key, h.Value);
}
if (content != null)
{
await content.CopyToAsync(req.Content);
await req.Content.FlushAsync();
req.Content.Seek(0, SeekOrigin.Begin);
}
var length = req.Content.Length;
if (length == 0)
{
if (headers.ContainsKey("Content-Type")) headers.Remove("Content-Type");
if (headers.ContainsKey("Content-Length")) headers.Remove("Content-Length");
}
else
{
if (!headers.ContainsKey("Content-Type")) throw new Exception("'Content-Type' HTTP header is missing.");
headers["Content-Length"] = length.ToString();
}
if (!headers.ContainsKey("Accept")) headers["Accept"] = "*/*";
return req;
}