Seamlessly Integrating Azure Document Intelligence with Azure API Management (APIM)

Thank you for this suggestion! This is the way I chose to go, and it works better than the code suggested in the article. I ended up with a 404 resource not found when doing it with send-request.

In the end, this is the operation policy on my DocumentIntelligence AnalyzeDocumentFromStream:

<!--
    - Policies are applied in the order they appear.
    - Position <base/> inside a section to inherit policies from the outer scope.
    - Comments within policies are not preserved.
-->
<!-- Add policies as children to the <inbound>, <outbound>, <backend>, and <on-error> elements -->
<policies>
    <!-- Throttle, authorize, validate, cache, or transform the requests -->
    <inbound>
        <base />
    </inbound>
    <!-- Control if and how the requests are forwarded to services  -->
    <backend>
        <base />
    </backend>
    <!-- Customize the responses -->
    <outbound>
        <base />
        <set-header name="operation-location" exists-action="override">
            <value>@{
            // Original operation-location from backend
            var originalOpLoc = context.Response.Headers.GetValueOrDefault("operation-location", "");
            // Encode original URL to pass as query parameter
            var encoded = System.Net.WebUtility.UrlEncode(originalOpLoc);
            // Construct APIM URL pointing to poller endpoint with backendUrl
            var apimUrl = originalOpLoc.Replace("document intelligence hostname", "apim hostname");
            return apimUrl;
        }</value>
        </set-header>
    </outbound>
    <!-- Handle exceptions and customize error responses  -->
    <on-error>
        <base />
    </on-error>
</policies>

Works like a charm now 🙂

I am not sure I understand your question completely. if we just replace with APIM host, we lose the information on the URL the subsequent get request to be sent to.