# Functions
get boolean from metadata in context use strconv.Parse.
metadata API for client.
metadata API for server.
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FromContext returns the incoming metadata in ctx if it exists.
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get int64 value from metadata in context.
IsIncomingKey represent this key should extract from rpc metadata.
IsOutgoingKey represent this key should propagate by rpc.
New creates an MD from a given key-value map.
给 ctx 加入 md 的 kv 传递，返回一个子 ctx.
pointer.
create mds from kv list.
get string value from metadata in context.
get value from metadata in context return nil if not found.
# Constants
metadata const key.
metadata const key.
metadata const key.
Network.
metadata const key.
metadata const key.
# Structs
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# Type aliases
MD is a mapping from metadata keys to values.