package envoy.extensions.http.stateful_session.header.v3

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This extension allows the session state to be tracked via request headers. This extension encodes the address of the upstream host selected by the load balancer into a response header with the :ref:`header configuration <envoy_v3_api_msg_extensions.http.stateful_session.header.v3.HeaderBasedSessionState>`. When new requests are incoming, this extension will try to parse the specific upstream host address by header name. If the address parsed from the header corresponds to a valid upstream host, this upstream host will be selected first. See :ref:`stateful session filter <envoy_v3_api_msg_extensions.filters.http.stateful_session.v3.StatefulSession>`. For example, if the header name is set to ``session-header``, Envoy will prefer ``1.2.3.4:80`` as the upstream host when the request contains the following header: .. code-block:: none session-header: "MS4yLjMuNDo4MA==" When processing the upstream response, if ``1.2.3.4:80`` is indeed the final choice the extension does nothing. If ``1.2.3.4:80`` is not the final choice, the new selected host will be set to response headers (via the ``session-header`` response header). [#extension: envoy.http.stateful_session.header]

• string name = 1

  The name that will be used to obtain header value from downstream HTTP request or generate new header for downstream.