Hook when creating request

AzureHttpClientRequestMessage.cs

using Microsoft.OData.Client;
using System;
using System.Collections.Specialized;
using System.Web;

namespace Biometria.Discovery.OData
{
    public static class Extensions
    {
        public static NameValueCollection UseNameValue(this NameValueCollection things, string name, string value)
        {
            things.Set(name, value);
            return things;
        }
    }

    public class AzureHttpClientRequestMessage : HttpClientRequestMessage
    {
        public override Uri Url { get; set; }

        protected ConfigurationCache Cache = new ConfigurationCache();

        public AzureHttpClientRequestMessage(DataServiceClientRequestMessageArgs args) : base(args)
        {
            Url = new UriBuilder(args.RequestUri)
            {
                Query = HttpUtility
                    .ParseQueryString(args.RequestUri.Query)
                    .UseNameValue("api-version", "2021-04-30-Preview")
                    .ToString()
            }.Uri;

            SetHeader("Content-Type", "application/json");
            SetHeader("api-key", Cache.GetSearchApiKey().Result);
        }
    }
}

Query string is updated along with the headers but not propagated with the request to Azure Seach