Pseudocode example: relation between UseDefaultFiles, UseSpaStaticFiles and UseSpa

Startup.cs

// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
    // ...
    services.AddSpaStaticFiles(configuration =>
               {
                   configuration.RootPath = "wwwroot";
               });   
    // ...
}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app)
{
    // ... 
    app.UseSwagger();
    app.UseSwaggerUI(c => { c.SwaggerEndpoint("/swagger/v1/swagger.json", "API V1"); });

    app.UseMiddleware<HostLoggingMiddleware>();

    app.UseMiddleware<ContentSecurityPolicyMiddleware>();

    // Re-write path only. / to /index.html
    app.UseDefaultFiles();

    // Start serve files from wwwroot (Must be after UseDefaultFiles obviously.)
    app.UseSpaStaticFiles();

    app.UseRouting();

    // Your normal routes
    app.UseEndpoints(
        endpoints =>
        {
            endpoints.MapDefaultControllerRoute();
            endpoints.MapHealthChecks("/hc");
        });

    // Placed after normal routes, at end of pipeline, 
    // i.e. if request path did not match static content 
    // nor other routes, fallback to SPA
    app.UseSpa(spa =>
    {
        if (_environment.IsDevelopment())
        {
            spa.UseProxyToSpaDevelopmentServer("http://localhost:4000");
        }
    });
    
    // ...
}