[FnApi] Add support for a sending header metadata when connecting to ApiServiceDescriptor under StandardProtocols.API_SERVICE_DESCRIPTOR_HEADER_METADATA#38863
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…icate they support this via StandardProtocols.API_SERVICE_DESCRIPTOR_NAME. Runners may use such metadata to distinguish between incoming fnapi streams. A concrete usage for this is to indicate for different bundles to utilize different data streams to provide isolation.
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This can be used by runners to distinguish between incoming fnapi streams.
A concrete usage for this is to indicate for different bundles to utilize different data streams to provide isolation.
Adds support to the Java SDK to set the header key-value pair.
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