remote_execution: add digest metadata #303
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Add optional routing metadata for REAPI RPCs.
These are plain-text HTTP headers that can be parsed by popular load balancers
or reverse proxy solutions such as Caddy and Nginx to route RPC requests to
appropriate server instances.
RPC requests referencing or containing a single blob can use the
blob-digest
header to provide routing hint information.
RPC requests referencing or containing multiple blobs can use one blob, or
none, as a routing hint via the
blob-digest
header.