public void WriteResponseHeaders(int streamId, int statusCode, IHeaderDictionary headers)
{
lock (_writeLock)
{
_outgoingFrame.PrepareHeaders(Http2HeadersFrameFlags.NONE, streamId);
var done = _hpackEncoder.BeginEncode(statusCode, EnumerateHeaders(headers), _outgoingFrame.Payload, out var payloadLength);
_outgoingFrame.Length = payloadLength;
if (done)
{
_outgoingFrame.HeadersFlags = Http2HeadersFrameFlags.END_HEADERS;
}
Append(_outgoingFrame.Raw);
while (!done)
{
_outgoingFrame.PrepareContinuation(Http2ContinuationFrameFlags.NONE, streamId);
done = _hpackEncoder.Encode(_outgoingFrame.Payload, out var length);
_outgoingFrame.Length = length;
if (done)
{
_outgoingFrame.ContinuationFlags = Http2ContinuationFrameFlags.END_HEADERS;
}
Append(_outgoingFrame.Raw);
}
}
}
private void FinishWritingHeaders(int streamId, int payloadLength, bool done)
{
var buffer = _headerEncodingBuffer.AsSpan();
_outgoingFrame.PayloadLength = payloadLength;
if (done)
{
_outgoingFrame.HeadersFlags |= Http2HeadersFrameFlags.END_HEADERS;
}
WriteHeaderUnsynchronized();
_outputWriter.Write(buffer.Slice(0, payloadLength));
while (!done)
{
_outgoingFrame.PrepareContinuation(Http2ContinuationFrameFlags.NONE, streamId);
done = _hpackEncoder.Encode(buffer, out payloadLength);
_outgoingFrame.PayloadLength = payloadLength;
if (done)
{
_outgoingFrame.ContinuationFlags = Http2ContinuationFrameFlags.END_HEADERS;
}
WriteHeaderUnsynchronized();
_outputWriter.Write(buffer.Slice(0, payloadLength));
}
}
// Optional header fields for padding and priority are not implemented.
/* https://tools.ietf.org/html/rfc7540#section-6.2
+---------------+
|Pad Length? (8)|
+-+-------------+-----------------------------------------------+
|E| Stream Dependency? (31) |
+-+-------------+-----------------------------------------------+
| Weight? (8) |
+-+-------------+-----------------------------------------------+
| Header Block Fragment (*) ...
+---------------------------------------------------------------+
| Padding (*) ...
+---------------------------------------------------------------+
*/
public void WriteResponseHeaders(int streamId, int statusCode, IHeaderDictionary headers)
{
lock (_writeLock)
{
if (_completed)
{
return;
}
try
{
_outgoingFrame.PrepareHeaders(Http2HeadersFrameFlags.NONE, streamId);
var buffer = _headerEncodingBuffer.AsSpan();
var done = _hpackEncoder.BeginEncode(statusCode, EnumerateHeaders(headers), buffer, out var payloadLength);
_outgoingFrame.PayloadLength = payloadLength;
if (done)
{
_outgoingFrame.HeadersFlags = Http2HeadersFrameFlags.END_HEADERS;
}
WriteHeaderUnsynchronized();
_outputWriter.Write(buffer.Slice(0, payloadLength));
while (!done)
{
_outgoingFrame.PrepareContinuation(Http2ContinuationFrameFlags.NONE, streamId);
done = _hpackEncoder.Encode(buffer, out payloadLength);
_outgoingFrame.PayloadLength = payloadLength;
if (done)
{
_outgoingFrame.ContinuationFlags = Http2ContinuationFrameFlags.END_HEADERS;
}
WriteHeaderUnsynchronized();
_outputWriter.Write(buffer.Slice(0, payloadLength));
}
}
catch (HPackEncodingException hex)
{
// Header errors are fatal to the connection. We don't have a direct way to signal this to the Http2Connection.
_connectionContext.Abort(new ConnectionAbortedException("", hex));
throw new InvalidOperationException("", hex); // Report the error to the user if this was the first write.
}
}
}
