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So I have BC 27.1 running in a local Docker container. And I have a Visual Studio 2022 ASP.NET Core web app also running. The issue involves a BC codeunit procedure that is making the API request. It returns back NavHttpClient Error Code 0. This is a simple GET request to the localhost that's running a debug of the ASP.NET Core web app. No authorization. No content body. When debugging on the VS Code end for the AL codeunit procedure, I can Ctrl+Click the request URL and it comes up just fine in a web browser. And using the same request URL in a Postman GET request, it comes back fine as well.

I'll paste my AL procedure code below. Along with another test procedure to a third-party test web service that works fine. It's just my own localhost web app that's failing. Perhaps this is due to server certificate validation failing? I tried disabling that feature in my code, although with BC 27.1, I thought that this couldn't be disabled. I even tried replacing the request URL with the http alternative to https and that runs into the same issue.

Any advice? I have enabled HttpClient calls in my extension setup. And the other test procedure works fine.

procedure MyApiCall(): Text // This fails.
    var
        Client: HttpClient;
        Request: HttpRequestMessage;
        Response: HttpResponseMessage;
        Content: HttpContent;
        Headers: HttpHeaders;
        ResponseText: Text;
        RequestUrl: Text;
    begin
        RequestUrl := 'https://localhost:7043/test';
        Request.SetRequestUri(RequestUrl);
        Request.Method('GET');
        Request.GetHeaders(Headers);
        Headers.Clear();
        Headers.Add('Accept', 'application/json');
        Headers.Add('Connection', 'keep-alive');
        Headers.Add('Accept-Encoding', 'gzip, deflate, br');
        Headers.Add('User-Agent', 'Business-Central-365');
        Client.UseServerCertificateValidation(false);
        Client.Send(Request, Response);
        Response.Content().ReadAs(ResponseText);
        exit(ResponseText);
    end;

procedure TestApiRequest(): Text // This works.
    var
        Client: HttpClient;
        RequestHeaders: HttpHeaders;
        RequestContent: HttpContent;
        ResponseMessage: HttpResponseMessage;
        RequestMessage: HttpRequestMessage;
        ResponseText: Text;
        RequestUrl: Text;
    begin
        RequestUrl := 'https://api.restful-api.dev/objects';
        RequestHeaders := Client.DefaultRequestHeaders();
        RequestContent.GetHeaders(RequestHeaders);

        Client.Get(RequestUrl, ResponseMessage);
        ResponseMessage.Content().ReadAs(ResponseText);
        exit(ResponseText);
    end;

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Dynamics 365 Business Central