Do you know how to configure YARP?

// appsettings.json

{
  "ReverseProxy": {
    "Routes": {
      "webAppLegacyServePath": {
        "ClusterId": "webAppLegacyClusterId",
        "Match": {
          "Path": "/legacyWebapp/{**catch-all}"
        }
      }
    },
    "Clusters": {
      "webAppLegacyClusterId": {
        "Destinations": {
          "webAppLegacyServePath": {
            "Address": "http://localhost:5001"
          }
        }
      }
    }
  }
}

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddReverseProxy().LoadFromConfig(builder.Configuration.GetSection("ReverseProxy"));

var app = builder.Build();
app.MapReverseProxy();
app.Run();

var webRoutes = new List<RouteConfig>
        {
                // Route for Legacy WebApp
                new()
                {
                    RouteId = "webAppLegacyServePath",
                    ClusterId = webAppLegacyClusterId,
                    Match = new RouteMatch
                    {
                        Path = "/legacyWebapp/{**catch-all}",
                    },
                },
        };

var webClusters = new List<ClusterConfig>
        {
            // Cluster for Legacy WebApp

            new()
            {
                ClusterId = webAppLegacyClusterId,
                Destinations = new Dictionary<string, DestinationConfig>
                {
                    {"webAppLegacyServePath", new DestinationConfig{ Address = webAppLegacyAddress } }
                }
            },
        };

services
    .AddReverseProxy()
    .Services.AddSingleton<IProxyConfigProvider>(
    new YarpInMemoryConfiguration(webRoutes, webClusters));
// YarpInMemoryConfiguration is the boilerplate class, see the repo for more details.