Excluding Swagger from YARP routing

Question

I've got a use case where I want to host both an API and its frontend on the same port. I use YARP to do this.

So all requests to https://localhost:5001 will by default be routed to https://localhost:5173/. However, the minimal API routes (/api) have precedence and will not be routed by YARP. This works well.

I'm trying to add Swagger into the mix and I have an issue where the requests for its static content will be routed through YARP. For example: https://localhost:5001/api/swagger/index.html will load correctly, but https://localhost:5001/api/swagger/swagger-ui.css will be routed by YARP.

This is my setup:

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

builder.Services
    .AddReverseProxy()
    .LoadFromConfig(builder.Configuration.GetSection("ReverseProxy"));

var app = builder.Build();

app.MapGet("/api/hello", () => "Hello World!");

app.UseSwagger();
app.UseSwaggerUI(options =>
{
    options.RoutePrefix = "api/swagger";
});

app.MapReverseProxy();

app.Run();

Config:

  "ReverseProxy": {
    "Routes": {
      "route1": {
        "ClusterId": "cluster1",
        "Match": {
          "Path": "{**catch-all}"
        }
      }
    },
    "Clusters": {
      "cluster1": {
        "HttpClient": {
          "SslProtocols": [
            "Tls12"
          ]
        },
        "Destinations": {
          "cluster1/destination1": {
            "Address": "https://localhost:5173/"
          }
        }
      }
    }
  }

What can I do to fix this? I haven't been able to figure out how to exclude all /api/swagger routes from YARP.