# README
contextx：使用后缀 x 表示扩展或变体，简洁且易于记忆。
# Functions
AccessToken extract accessToken from context.
Claims extract claims info from context.
Namespace is an alias for UserID.
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UserID extract userID from context.
UserM extract *UserM from extract.
WithAccessToken put accessToken into context.
WithClaims put claims info into context.
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WithUserID put userID into context.
WithUserM put *UserM into context.