Swagger failing with Failed to load API definition (yet another thread) - asp.net-core-webapi

Question

I tried to add swagger to an existing api and after failing alot, i decided to create a new solution, create a new asp.net core 2.2 api and added swagger as per
https://learn.microsoft.com/en-us/aspnet/core/tutorials/getting-started-with-swashbuckle?view=aspnetcore-2.2&tabs=visual-studio
The other posts regarding this issue seem all to indicate a situation where there are multiple httpverbs or none, which is not the case with the default valuescontroller. It gives me the error
Failed to load API Definition.
Fetch error, Service unavailable /swagger/v1/swagger.json
The actual json file at api/swagger/v1/swagger.json actually renders correctly
My startup class is
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
services.AddSwaggerGen(c =>{
c.SwaggerDoc("v1", new Info { Title = "My API", Version = "v1" });
});
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseSwagger();
app.UseSwaggerUI(c =>
{
c.SwaggerEndpoint("/swagger/v1/swagger.json", "My API V1");
});
app.UseMvc();
}
}
Im using Swachbuckle.AspNetCore v 4.01.

Answer 1

String SwaggerEndpoint = "/swagger/v1/swagger.json";
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseHsts();
SwaggerEndpoint = "/andi/swagger/v1/swagger.json";
}
app.UseMvc();
app.UseSwagger();
app.UseSwaggerUI(options =>
{
options.SwaggerEndpoint(SwaggerEndpoint, "My API");
//options.RoutePrefix = string.Empty;
});