question

Make sure your "launchUrl" setting in launchSettings.json are correct and matches your configuration. I use the standard Web API template of "swagger". Share your configuration if you still need help.

   "profiles": {
     "IIS Express": {
       "commandName": "IISExpress",
       "launchBrowser": true,
       "launchUrl": "swagger",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"
       }
     },

 app.UseSwaggerUI(c => {
     c.SwaggerEndpoint("/swagger/v1/swagger.json", "WebApiDemo v1");
     c.RoutePrefix = "swagger";
 });

Well this line ' "launchUrl": "swagger",' was missing in my launchSettings.json and my c.RoutePrefix was set to string.empty. Everything else was exactly the same. I made those two changes and no chnages in SwaggerUI display. Evrthing thing works as it should other than a blank page when running on IISExpress SSL localhost URL.

Hi @Orgbrat,
Is your swagger middleware configured correctly?like this:

 public void ConfigureServices(IServiceCollection services)
 {
     // Register the Swagger generator, defining 1 or more Swagger documents
     services.AddSwaggerGen(c =>
     {
         c.SwaggerDoc("v1", new OpenApiInfo { Title = "My API", Version = "v1" });                
     });
     services.AddControllers();
 }

This adds the Swagger generator to the services collection.
In the Configure() method, let’s enable the middleware for serving the generated JSON document and the Swagger UI:

 public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
 {
     // Enable middleware to serve generated Swagger as a JSON endpoint.
     app.UseSwagger();
     // Enable middleware to serve swagger-ui (HTML, JS, CSS, etc.),
     // specifying the Swagger JSON endpoint.
     app.UseSwaggerUI(c =>
     {
         c.SwaggerEndpoint("/swagger/v1/swagger.json", "My API V1");
     });
 }

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Best Regards,

ChaoDeng

I want to deploy API those , I developed in asp.net core 5. but unable to fix it.
I have installed every thing but getting error on it

https://www.yardim.pk

Thanks,