Module metadata 

Custom request, response, and trailing metadata.

gRPC distinguishes “ASCII metadata” (printable-ASCII values) from “binary metadata” (key ends in -bin, value base64-encoded on the wire). Reserved keys (grpc-*, te, content-type, user-agent, HTTP/2 pseudo-headers) are owned by the framework and rejected on insert.

Metadata is an ordered map that round-trips through trillium::Headers. It backs Status::metadata, the trailing metadata sent alongside an error status.

Structs

Metadata

An ordered, multi-valued map of custom gRPC metadata. Keys may repeat; insertion order is preserved through the round-trip to and from trillium::Headers.

Enums

MetadataError

Why an insert into Metadata was rejected.

MetadataValue

A single metadata value: either printable ASCII text or, for -bin keys, raw bytes (base64-encoded on the wire).