A lifetime describes the scope for which a reference remains valid. Rust infers or checks annotated lifetimes to ensure references do not outlive their underlying values, preventing dangling pointers and use-after-free errors. section 2.3.2
In an HTTP response model, the lifetime parameter 'a is attached to reference fields such as the protocol version, status strings, and header map keys and values. section 2.3.2
Annotating an HTTP response
Define `HttpResponse<'a>` with fields such as `version: &'a str`, `status_code: &'a str`, and `headers: Option<HashMap<&'a str, &'a str>>`. Implement `Default`, `new()`, getters, and serialization while preserving the same lifetime parameter across the reference-bearing fields.
