public class TestController : LiteController
{
    // will respond to /api/test/add?a=3&b=8
    public int Add(int a, int b)
    {
        return a + b;
    }
}

[Restful]
public class PersonsController: LiteController
{
    private readonly IPersonDataAccess _dataAccess;

    public PersonsController(IPersonDataAccess dataAccess)
    {
        _dataAccess = dataAccess;
    }

    // method names are not affecting action routes

    [HttpGet] // will respond to /api/persons?id={someGuid}
    public Task<PersonModel> ByIdAsync(Guid id) => _dataAccess.GetAsync(id);

    [HttpGet, ActionRoute("/{id}")] // will respond to /api/persons/{someGuid}
    public PersonModel ByIdFromRoute([FromRoute]Guid id) => _dataAccess.Get(id);

    [HttpGet] // will respond to /api/persons
    public IEnumerable<PersonModel> All() => _dataAccess.GetAll();

    [HttpPost] // will respond to /api/persons
    public PersonModel Save(PersonModel model) => _dataAccess.Save(model);

    [HttpPost, ActionRoute("/{id}")] // will respond to /api/persons/{someGuid}
    public PersonModel Update(Guid id, PersonModel model) => _dataAccess.Update(id, model);
}

[ControllerRoute("/api/v2/ops")]
public class OperationsController : LiteController
{
    // will respond to /api/v2/ops/3/plus/8
    [ActionRoute("/{a}/plus/{b}")]
    [HttpGet] // [HttpGet] is optional, by default it's GET, otherwise you can use [HttpPost], [HttpPut] or [HttpDelete]
    public int Add(int a, int b) => a + b;
    
    // will respond to /api/v2/ops/sum?ints=3&ints=6&ints=4
    public int Sum(IEnumerable<int> ints) => ints.Sum();
    
    // will respond to /api/v2/ops/join?a.1=one&a.3=three&b.2=two
    public IDictionary<int, string> Join(IDictionary<int, string> a, Dictionary<int, string> b)
    {
        Dictionary<int, string> c = new Dictionary<int, string>();
        foreach (var keyValue in a)
        {
            c[keyValue.Key] = keyValue.Value;
        }
        foreach (var keyValue in b)
        {
            c[keyValue.Key] = keyValue.Value;
        }
        return c;
    }

}

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using LiteApi;

namespace MyApp
{
    public class Startup
    {
        // ... configure services ...
        
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole();
            app.UseStaticFiles(); // if you want static files (LiteApi does not support static files by itself)
            app.UseLiteApi();
        }
    }
}