Fix: InvalidOperationException: Synchronous operations are disallowed
Replace the Stream.Read or Write call with ReadAsync/WriteAsync. As a last resort, set AllowSynchronousIO on Kestrel, IIS, or per-request via IHttpBodyControlFeature.
Tag: kestrel
2 posts
Kestrel starts processing HTTP/3 requests before the SETTINGS frame in .NET 11 Preview 3
.NET 11 Preview 3 lets Kestrel serve HTTP/3 requests before the peer's control stream and SETTINGS frame arrive, shaving handshake latency off the first request on every new QUIC connection.