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For some requests, the client is required to check the server's HTTP/3 SETTINGS. For example, a client is only allowed to send HTTP/3 datagrams if the server explicitly enabled support. SETTINGS are sent asynchronously on a control stream (usually the first unidirectional stream). This means that the SETTINGS might not be available at the beginning of the connection. This is not expected to be the common case, since the server can send the SETTINGS in 0.5-RTT data, but we have to be able to deal with arbitrary delays. For WebTransport, there are even more SETTINGS values that the client needs to check. By making CheckSettings a callback on the RoundTripOpt, this entire validation logic can live at the WebTransport layer. |
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