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Avoid intermediate strings in MCP transport serialization (#1274)

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>
Co-authored-by: halter73 <54385+halter73@users.noreply.github.com>
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Copilot 2026-02-18 13:01:56 -05:00 • committed by GitHub
commit f3da4729f5
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1 changed files with 136 additions and 63 deletions
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6
src/ModelContextProtocol.Core/Server/StreamServerTransport.cs
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@ -74,9 +74,9 @@ public class StreamServerTransport : TransportBase
try
{
var json = JsonSerializer.Serialize(message, McpJsonUtilities.JsonContext.Default.JsonRpcMessage);
LogTransportSendingMessageSensitive(Name, json);
await _outputStream.WriteAsync(Encoding.UTF8.GetBytes(json), cancellationToken).ConfigureAwait(false);
var json = JsonSerializer.SerializeToUtf8Bytes(message, McpJsonUtilities.JsonContext.Default.JsonRpcMessage);
LogTransportSendingMessageSensitive(message);
await _outputStream.WriteAsync(json, cancellationToken).ConfigureAwait(false);
await _outputStream.WriteAsync(s_newlineBytes, cancellationToken).ConfigureAwait(false);
await _outputStream.FlushAsync(cancellationToken).ConfigureAwait(false);
}