fix: Only send mtlsEndpoint if it is non-null #3767
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blakeli0
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🤖 I have created a release *beep* *boop* --- <details><summary>2.56.3</summary> ## [2.56.3](v2.56.2...v2.56.3) (2025-05-02) ### Bug Fixes * Only send mtlsEndpoint if it is non-null ([#3767](#3767)) ([8f8df7b](8f8df7b)) * subscribe Airlock Docker image definition to GRPC updates ([#3765](#3765)) ([d0f43e3](d0f43e3)) ### Dependencies * update dependency com.google.errorprone:error_prone_annotations to v2.38.0 ([#3773](#3773)) ([e16fe65](e16fe65)) * update gapic-showcase to 36.2 ([#3771](#3771)) ([15b2577](15b2577)) * update google auth library dependencies to v1.34.0 ([#3772](#3772)) ([406a180](406a180)) * Update maven-shared-utils to v3.2.1 ([#3768](#3768)) ([7ec93c3](7ec93c3)) </details> --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). --------- Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com> Co-authored-by: Lawrence Qiu <lawrenceqiu@google.com>
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Temporary fix to only plumb the mtlsEndpoint to the gRPCChannelProviders if this has been set with a non-null value. Validation will still go through if it is set with bogus values.
Issue reported in googleapis/java-bigtable#2565
This seems to due to how Bigtable wrappers the generated stubs. BigTable manually calls setEndpoint to for the StubSettings, but does not do the equivalent for setMtlsEndpoint. The EndpointContext is only aware of the TLS endpoint and passes a null value to the ChannelProviders.
Potential longer term fix: BigTable's wrappers would need to set the mTLS Endpoint. This would be needed for BigTable to support S2A. This does not impact any of BigTable's existing functionality as the endpoint resolution for all non-S2A flows is done via
setEndpoint().