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Request tagging
===============
Each request contains a ``tags: Map[String, Any]`` map. This map can be used to tag the request with any backend-specific information, and isn't used in any way by sttp itself.
Tags can be added to a request using the ``def tag(k: String, v: Any)`` method, and read using the ``def tag(k: String): Option[Any]`` method.
Backends, or :ref:`backend wrappers <custombackends>` can use tags e.g. for logging, passing a metric name, using different connection pools, or even different delegate backends.
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