Is it possible to put a structure into the context via context.WithValue?

Yes, in Go you can store a struct in the context using context.WithValue. However, it is important to remember that the context is intended for passing request-related data such as timeouts, deadlines, and metadata, not for passing large or mutable structures.

Example:

Type User struct {
    ID   int
    Name string
}

ctx := context.Background()
user := &User{ID: 1, Name: "Alice"}
ctx = context.WithValue(ctx, "user", user)

// Retrieval
u, ok := ctx.Value("user").(*User)
if ok {
    fmt.Println(u.Name)
}

It is recommended to use key types that do not conflict with other packages, such as custom key types, to avoid collisions.