How to do a GET Request with Fast Endpoints in ASP.NET?

Question

As the title of this question tells, how could I do a GET request with Fast Endpoints in ASP.NET

Now I have tried to do this:

using api.Blogs.Shared;
using api.Data;
using AutoMapper;
using FastEndpoints;
using Microsoft.EntityFrameworkCore;

namespace api.Blogs.ListBlogsEndpoint;
public class ListBlogsEndpoint(BlogDbContext context, AutoMapper.IMapper mapper) : Endpoint<ListBlogsRequest, BlogResponse[]>
{
    public override void Configure()
    {
        Get("blogs");
    }

    public override async Task HandleAsync(ListBlogsRequest req, CancellationToken ct)
    {
        var blogs = await context.Blogs.ToArrayAsync(ct);
        var response = blogs.Select(b => mapper.Map<BlogResponse>(b)).ToArray();

        await SendOkAsync(response, ct);
    }
}

But when I try to do a get request I get the following error: TypeError: Failed to execute 'fetch' on 'Window': Request with GET/HEAD method cannot have body.
I don't know what to do now, I have searched about it, and it seems that the Request in a GET request should be query parameters, but they are used here as a body

EDIT: I'm using swagger, and it provide me with a body, so I think if I use postman it would be fine.

Answer 1

most likely you have gotten the middleware setup wrong. the following works out of the box:

var bld = WebApplication.CreateBuilder(args);
bld.Services
   .AddFastEndpoints()
   .SwaggerDocument(); //define swagger doc

var app = bld.Build();
app.UseFastEndpoints()
   .UseSwaggerGen(); //enable swagger middleware
app.Run();

public record ListBlogsRequest(string? Query);

sealed class ListBlogsEndpoint : Endpoint<ListBlogsRequest, string[]>
{
    public override void Configure()
    {
        Get("blogs");
        AllowAnonymous();
    }

    public override async Task HandleAsync(ListBlogsRequest req, CancellationToken ct)
    {
        string[] response = ["one", "two", req.Query!];
        await SendAsync(response);
    }
}

you may have called swagger methods that use swashbuckle (now abandoned), which is not supported by fastendpoints. do the swagger middleware as explained in the docs here.