 in incoming_headers:
        val = request.headers.get(ihdr)
        if val is not None:
            headers[ihdr] = val

    return headers
</code></pre><p>The reviews application (Java) does something similar using <code>requestHeaders</code>:</p><div><a data-skipendnotes=true style=display:none href='https://raw.githubusercontent.com/istio/istio/release-1.9/PathParam("productId") int productId,'>Zip</a><pre><code class=language-java data-expandlinks=true data-repo=istio>@GET
@Path(&#34;/reviews/{product