OpenTelemetry SDK
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    SEMATTRS_HTTP_HOST: "http.host" = TMP_HTTP_HOST

    The value of the HTTP host header. An empty Host header should also be reported, see note.

    Note: When the header is present but empty the attribute SHOULD be set to the empty string. Note that this is a valid situation that is expected in certain cases, according the aforementioned section of RFC 7230. When the header is not set the attribute MUST NOT be set.