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Michael Lumish 088436d01c [xds] Implement gRFC A101 (#41051)
This includes two major changes:

 1. An additional credentials option `sni_override` with the type `optional<string>`. If `nullopt`, it has no effect, and if set to the empty string it disables sending SNI entirely. Otherwise, the specified string will be sent.
 2. The implementation of [gRFC A101](https://github.com/grpc/proposal/blob/master/A101-SNI-setting-and-SNI-SAN-validation.md) using that new option. This includes options to set SNI and to validate SAN values against the set SNI value.

Closes #41051

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/41051 from murgatroid99:xds_sni_support 6a1f8667dedc19947532720495b2932889236a12
PiperOrigin-RevId: 855765736
2026-01-13 09:48:39 -08:00
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