Unable to Test .NET Core 6.0 Web API with Postman, Error Occurs

I assume you are passing the Entitilement inside the Header. Could you please check whether you run in debug mode or release mode.

Hello Sujeet,

Please follow the below steps:

API controller

Run the application.

Below is the request in the postman and it's working as expected.

curl --location 'https://localhost:7051/api/Values' \
--header 'Content-Type: application/json' \
--data '{
    "id": "",
    "firstName": "Jaimin",
    "lastName": "Shethiya",
    "mno": 7990233523
}'

hi i have to send data as text. so i need to keep the same method format.i tried with text also in postman still controller not hitting the break point.For testing i also changed method and tried with json.no break point hit happening

i have tried with both ways but still controller not getting hitted.both i am getting response like

i have disabled all proxy from postman

my requirment is send data in the form of plain/text format not json.so i need to keep this method as it is.

below i my start up class if you want to check

  public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        private IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            var openIdConfiguration = Configuration.GetSection("OpenID");
            var baseUrl = openIdConfiguration.GetSection("BaseURL").Value;
            var clientId = openIdConfiguration.GetSection("ClientID").Value;
            var clientSecret = openIdConfiguration.GetSection("ClientSecret").Value;

            services.AddDistributedMemoryCache();
            services.AddAuthentication(OAuth2IntrospectionDefaults.AuthenticationScheme)
                .AddOAuth2Introspection(options =>
                {
                    options.EnableCaching = true;
                    options.CacheDuration = new TimeSpan(0, 1, 0, 0);
                    options.Authority = baseUrl;
                    options.ClientId = clientId;
                    options.ClientSecret = clientSecret;

                    options.Events.OnAuthenticationFailed = ctxt =>
                    {
                        var logger = ctxt.HttpContext.RequestServices.GetRequiredService>();
                        logger.LogInformation($"Authentication failure for {ctxt?.Principal?.Identity?.Name}");
                        return Task.CompletedTask;
                    };
                });

            services.AddOptions();
            services.Configure(Configuration.GetSection("IpRateLimiting"));

            services.AddSingleton();
            services.AddSingleton();
            services.AddSingleton();
            services.AddDistributedRateLimiting();

            services.AddControllers();
            services.AddSingleton(Configuration);

            services.AddDbContext(optionsBuilder =>
                optionsBuilder.UseNpgsql(Configuration.GetConnectionString("RoomDb"),
                    options => options.EnableRetryOnFailure()));

            services.AddSingleton(provider =>
                new AuthenticationService(baseUrl, provider.GetRequiredService>()));

            services.AddScoped(provider =>
                new S3Repository(
                    provider.GetRequiredService>(),
                    Configuration));

            services.AddScoped(provider =>
                new RoomDataService(
                    provider.GetRequiredService>(),
                    provider.GetRequiredService(),
                    provider.GetRequiredService()));

            services.AddScoped();

            services.AddMvc(options =>
            {
                options.InputFormatters.Insert(0, new RawJsonBodyInputFormatter());
            });

            services.AddSwaggerGen();
        }


        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            using var scope = app.ApplicationServices.CreateScope();
            var services = scope.ServiceProvider;
            var dbContext = services.GetRequiredService();
            dbContext.Database.EnsureCreated();

            try
            {
                var databaseCreator = dbContext.Database.GetService() as RelationalDatabaseCreator;
                databaseCreator.CreateTables();
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error while creation database tables (maybe they exist already?)");
            }

            app.UseRouting();

            app.UseAuthentication();
            app.UseAuthorization();
            app.UseIpRateLimiting();

            app.Use(async (context, next) =>
            {
                context.Response.Headers.Add("X-Content-Type-Options", "nosniff");
                context.Response.Headers.Add("Strict-Transport-Security", "max-age=31536000; includeSubdomains");
                await next();
            });

            if (env.IsDevelopment())
            {
                app.UseSwagger();
                app.UseSwaggerUI();
            }

            app.UseEndpoints(endpoints =>
            {
                if (env.IsDevelopment())
                {
                    // endpoints.MapControllers().WithMetadata(new AllowAnonymousAttribute());
                }
                else
                {
                    endpoints.MapControllers();
                }
            });
        }
    }

Hi Sujeet Raman,

by  seeing your controller code

public async Task> SaveRoom([FromBody] string roomData){}

accepting as  string   not as model  class  

but from postman you are passing json format 

two things you can try

1.   change your controller code from  string roomData to model class
2. or from postman pass  as string   it will hit your controller method

What do you get an error message from post-man  and Error Status 404 or 403

can you try this

http://localhost::8080/api/saveRoom

break point also not hitting to the controller method.dont understand why

below is my controller code

  [HttpPost("saveRoom")]
        public async Task> SaveRoom([FromBody] string roomData)
        {
            Request.Headers.TryGetValue("Entitlement", out var entitlement);
            roomData = HttpUtility.UrlDecode(roomData);

            if (string.IsNullOrWhiteSpace(entitlement) || string.IsNullOrWhiteSpace(roomData))
            {
                _log.LogWarning($"POST /saveRoom without entitlement");
                return BadRequest();
            }
            
            _log.LogInformation($"POST /saveRoom entitlement={entitlement}");

            var roomObject = JObject.Parse(roomData);
            if (!roomObject.IsValid(_roomSchema))
            {
                return BadRequest();
            }
            
            return await _roomDataService.SaveRoom(entitlement, roomData);
        }
    }

when i run the application a comman prompt from .net core coming and displaying

[16:01:29 INF] Now listening on: http://[::]:8080
[16:01:29 INF] Application started. Press Ctrl+C to shut down.
[16:01:29 INF] Hosting environment: Development
[16:01:29 INF] Content root path: C:\my_learn\WebAppApi

 I think you did not attach the correct file here, Please attach the controller code with the endpoint, We can fix this 

Please send the controller code and the endpoint you hit in postman.