ASP.NET Core response compression not working - asp.net-core

Question

I have an endpoint that loads a json from a file and then return its contents (ASP.NET Core 2.0):
[Produces("application/json")]
[Route("api/[controller]")]
public class ReportsController : Controller
{
private readonly IHostingEnvironment _hostingEnvironment;
public ReportsController(IHostingEnvironment hostingEnvironment)
{
_hostingEnvironment = hostingEnvironment;
}
[HttpGet]
public IActionResult Get()
{
try
{
string contentRootPath = System.IO.Path.Combine(_hostingEnvironment.ContentRootPath, "reports");
return Ok(System.IO.File.ReadAllText(contentRootPath + "\\teste.json"));
}
catch (Exception ex)
{
return StatusCode(500, new ResponseError(ex.Message));
}
}
}
When hitting this endpoint in Chrome, I get the following network data:
Now if I enable response compression, the size of the request gets bigger:
Here's my ConfigureServices and Configure methods:
public void ConfigureServices(IServiceCollection services)
{
services.AddResponseCompression(options =>
{
options.Providers.Add<GzipCompressionProvider>();
});
services.AddApplicationServices();
services.AddDbContext<DatabaseContext>(...);
services.AddCors();
services.AddIdentity<ApplicationUser, IdentityRole>().AddEntityFrameworkStores<DatabaseContext>();
services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
.AddJwtBearer(options =>
{
...
});
services.AddMvc().AddJsonOptions(options => { ... });
services.AddAuthorization(options =>
{
...
});
services.AddEntityFrameworkSqlServer();
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseResponseCompression();
app.UseCors(c => c.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod());
app.UseAuthentication();
app.UseMvc(routes =>
{
routes.MapRoute("default", "{controller=Home}/{action=Index}/{id?}");
});
app.UseStaticFiles();
}
What am I missing here?