public void WriteResponseHeaders(int statusCode, string reasonPhrase, HttpResponseHeaders responseHeaders) { lock (_contextLock) { if (_completed) { return; } var buffer = _pipeWriter; var writer = new CountingBufferWriter <PipeWriter>(buffer); writer.Write(_bytesHttpVersion11); var statusBytes = ReasonPhrases.ToStatusBytes(statusCode, reasonPhrase); writer.Write(statusBytes); responseHeaders.CopyTo(ref writer); writer.Write(_bytesEndHeaders); writer.Commit(); _unflushedBytes += writer.BytesCommitted; _totalBytesCommitted += writer.BytesCommitted; } }