Program.cs

using Microsoft.AspNetCore.HttpOverrides;
using MYIP.Client;

var builder = WebApplication.CreateBuilder(args);

// forward headers configuration for reverse proxy
builder.Services.Configure<ForwardedHeadersOptions>(options => {
    options.ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto;
    options.KnownNetworks.Clear();
    options.KnownProxies.Clear();
});

builder.Services.AddHttpClient<IpApiClient>();
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}
app.UseFileServer();
app.MapControllers();
app.Run();