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    HttpMetricsError

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    pub(all) suberror HttpMetricsError {
      MalformedAccept(String)
      AcceptHeaderTooLarge
      NotAcceptable
    } derive(Eq, 
    Debug    )

    Negotiation failures which can be mapped to a safe HTTP error response.
    pub(all) struct Header {
      name : String
      value : String
    }

    One response header emitted by the framework-neutral metrics adapter.

    MetricsResponse

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    pub(all) struct MetricsResponse {
      status : Int
      headers : Array[Header]
      content_type : String
      body : String
    }

    A complete HTTP response ready for a framework-specific adapter to send.

    content_type remains as a convenience field for the M0 API. The same value is always present exactly once in headers as Content-Type.

    MetricsResponse::header

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    fn MetricsResponse::header(self : MetricsResponse, name : String) -> String?

    Look up a response header case-insensitively for framework adapter tests.

    bad_request_response

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    fn bad_request_response() -> MetricsResponse

    Return the stable response used for malformed or oversized Accept headers.

    internal_error_response

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    fn internal_error_response() -> MetricsResponse

    Return the stable response used after gather or encoding fails.

    The body intentionally does not contain internal collector errors, label values, or a partial exposition.

    metrics_response

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    Wrap a fully encoded exposition without depending on an HTTP framework.

    metrics_response_from_exposition

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    Wrap an encoder result while preserving its format/content-type contract.

    negotiate

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    Select a supported exposition format from an HTTP Accept header.

    Missing or blank Accept defaults to Prometheus text 0.0.4 for legacy scraper compatibility. For equal quality and equally specific explicit formats, OpenMetrics wins; a wildcard-only tie remains Prometheus.

    negotiated_metrics_response

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    fn negotiated_metrics_response(accept : String?, prometheus_body : String, openmetrics_body : String) -> MetricsResponse

    Select one already-complete body for a framework-neutral metrics response.

    This is intentionally a pure function. A concrete server first calls negotiate, gathers and encodes exactly the selected format, then maps an encoder error to internal_error_response. Passing both bodies here keeps the content-negotiation contract directly testable without a web runtime.

    not_acceptable_response

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    fn not_acceptable_response() -> MetricsResponse

    Return the stable response used when neither supported format is acceptable.

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