This solution should help me explain my desire

ApiService/ApiService.csproj

@@ -4,5 +4,10 @@
     <TargetFramework>netcoreapp3.1</TargetFramework>
   </PropertyGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\RepositoryLibrary\RepositoryLibrary.csproj" />
+    <ProjectReference Include="..\SharedLibrary\SharedLibrary.csproj" />
+  </ItemGroup>
+
 
 </Project>

ApiService/Controllers/RepositoryController.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+using RepositoryLibrary;
+
+namespace ApiService.Controllers
+{
+    [ApiController]
+    [Route("/api")]
+    public class RepositoryController : ControllerBase
+    {
+        private readonly IRepository _repsitory;
+        public RepositoryController(IRepository repository)
+        {
+            _repsitory = repository;
+        }
+        [HttpGet("lookup")]
+        public async Task<object> Lookup()
+        {
+            return await _repsitory.Lookup();
+        }
+    }
+}

ApiService/Controllers/WeatherForecastController.cs

@@ -1,39 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Mvc;
-using Microsoft.Extensions.Logging;
-
-namespace ApiService.Controllers
-{
-    [ApiController]
-    [Route("[controller]")]
-    public class WeatherForecastController : ControllerBase
-    {
-        private static readonly string[] Summaries = new[]
-        {
-            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
-        };
-
-        private readonly ILogger<WeatherForecastController> _logger;
-
-        public WeatherForecastController(ILogger<WeatherForecastController> logger)
-        {
-            _logger = logger;
-        }
-
-        [HttpGet]
-        public IEnumerable<WeatherForecast> Get()
-        {
-            var rng = new Random();
-            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
-            {
-                Date = DateTime.Now.AddDays(index),
-                TemperatureC = rng.Next(-20, 55),
-                Summary = Summaries[rng.Next(Summaries.Length)]
-            })
-            .ToArray();
-        }
-    }
-}

ApiService/Properties/launchSettings.json

@@ -1,5 +1,4 @@
-{
+{
-  "$schema": "http://json.schemastore.org/launchsettings.json",
   "iisSettings": {
     "windowsAuthentication": false,
     "anonymousAuthentication": true,
@@ -8,23 +7,21 @@
       "sslPort": 0
     }
   },
+  "$schema": "http://json.schemastore.org/launchsettings.json",
   "profiles": {
     "IIS Express": {
       "commandName": "IISExpress",
-      "launchBrowser": true,
-      "launchUrl": "weatherforecast",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"
       }
     },
     "ApiService": {
       "commandName": "Project",
-      "launchBrowser": true,
+      "launchUrl": "api/lookup",
-      "launchUrl": "weatherforecast",
-      "applicationUrl": "http://localhost:5000",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"
-      }
+      },
+      "applicationUrl": "http://localhost:56143"
     }
   }
 }

ApiService/Startup.cs

@@ -1,14 +1,21 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
+using System.Net;
+using System.Runtime.Serialization.Json;
+using System.Text;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
+using RepositoryLibrary;
+using SharedLibrary.Models;
 
 namespace ApiService
 {
@@ -24,6 +31,7 @@ namespace ApiService
         // This method gets called by the runtime. Use this method to add services to the container.
         public void ConfigureServices(IServiceCollection services)
         {
+            services.AddScoped<IRepository, LocalRepository>();
             services.AddControllers();
         }
 
@@ -37,6 +45,30 @@ namespace ApiService
 
             app.UseRouting();
 
+            app.Use(async (context, next) =>
+            {
+                try
+                {
+                    await next();
+                }
+                catch (Exception ex)
+                {
+                    var error = new RepositoryError
+                    {
+                        Information = ex.Message,
+                        StackTrack = ex.StackTrace
+                    };
+                    var dc = new DataContractJsonSerializer(typeof(RepositoryError));
+                    using (var ms = new MemoryStream())
+                    {
+                        dc.WriteObject(ms, error);
+                        var response = new StringBuilder(Encoding.UTF8.GetString(ms.ToArray()));
+                        context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
+                        context.Response.ContentType = "application/json";
+                        await context.Response.WriteAsync(response.ToString());
+                    }
+                }
+            });
             app.UseAuthorization();
 
             app.UseEndpoints(endpoints =>

ApiService/WeatherForecast.cs

@@ -1,15 +0,0 @@
-using System;
-
-namespace ApiService
-{
-    public class WeatherForecast
-    {
-        public DateTime Date { get; set; }
-
-        public int TemperatureC { get; set; }
-
-        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
-
-        public string Summary { get; set; }
-    }
-}

RepositoryLibrary/HostedRepository.cs

@@ -0,0 +1,69 @@
+using SharedLibrary.Models;
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RepositoryLibrary
+{
+    public class HostedRepository : IRepository
+    {
+        private readonly string _backendUrl;
+        public static ConcurrentBag<HttpClient> ApiClient = new ConcurrentBag<HttpClient>();
+        public HostedRepository()
+        {
+            _backendUrl = "http://localhost:56143";
+        }
+        public async Task<object> Lookup()
+        {
+            return await GetAsync<string>();
+        }
+
+        private async Task<T> GetAsync<T>([CallerMemberName] string request = "")
+        {
+            string uri = GetUriString(request);
+            var client = GetHttpClient();
+            using (var response = await client.GetAsync(uri))
+            {
+                ReturnHttpClient(client);
+                if (response.IsSuccessStatusCode)
+                {
+                    var model = await response.Content.ReadAsAsync<T>();
+                    if (model != null)
+                    {
+                        return model;
+                    }
+                }
+                var err = await response.Content.ReadAsAsync<RepositoryError>();
+                if (err != null)
+                {
+                    throw new Exception(err.Information);
+                }
+                var str = await response.Content.ReadAsStringAsync();
+                throw new Exception(str);
+
+                
+            }
+        }
+        private HttpClient GetHttpClient()
+        {
+            if (!ApiClient.TryTake(out HttpClient client))
+            {
+                client = new HttpClient();
+            }
+            return client;
+        }
+        private void ReturnHttpClient(HttpClient client)
+        {
+            ApiClient.Add(client);
+        }
+        private string GetUriString(string request)
+        {
+            return $"{_backendUrl}/api/{request}";
+        }
+    }
+}

RepositoryLibrary/IRepository.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Threading.Tasks;
+
+namespace RepositoryLibrary
+{
+    public interface IRepository
+    {
+        Task<object> Lookup();
+    }
+}

RepositoryLibrary/LocalRepository.cs

@@ -0,0 +1,17 @@
+using SharedLibrary.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RepositoryLibrary
+{
+    public class LocalRepository : IRepository
+    {
+        public async Task<object> Lookup()
+        {
+            throw new RepositoryException();
+        }
+    }
+}

RepositoryLibrary/RepositoryLibrary.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="5.2.7" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\SharedLibrary\SharedLibrary.csproj" />
+  </ItemGroup>
+
+</Project>

ServicesCallsService.sln

@@ -3,9 +3,13 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 16
 VisualStudioVersion = 16.0.30611.23
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WebMVC", "WebMVC\WebMVC.csproj", "{FDAFEB96-62CA-46ED-8DC5-0D15F13CBF1B}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WebMVC", "WebMVC\WebMVC.csproj", "{FDAFEB96-62CA-46ED-8DC5-0D15F13CBF1B}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ApiService", "ApiService\ApiService.csproj", "{381379E2-15DC-4835-A260-7B1E52ADE46D}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ApiService", "ApiService\ApiService.csproj", "{381379E2-15DC-4835-A260-7B1E52ADE46D}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RepositoryLibrary", "RepositoryLibrary\RepositoryLibrary.csproj", "{79A0D2A7-A633-41DE-A67A-EAAA8BFD46EF}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SharedLibrary", "SharedLibrary\SharedLibrary.csproj", "{4E226D1F-35AA-4C4E-B4E5-55818F98B554}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -21,6 +25,14 @@ Global
 		{381379E2-15DC-4835-A260-7B1E52ADE46D}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{381379E2-15DC-4835-A260-7B1E52ADE46D}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{381379E2-15DC-4835-A260-7B1E52ADE46D}.Release|Any CPU.Build.0 = Release|Any CPU
+		{79A0D2A7-A633-41DE-A67A-EAAA8BFD46EF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{79A0D2A7-A633-41DE-A67A-EAAA8BFD46EF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{79A0D2A7-A633-41DE-A67A-EAAA8BFD46EF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{79A0D2A7-A633-41DE-A67A-EAAA8BFD46EF}.Release|Any CPU.Build.0 = Release|Any CPU
+		{4E226D1F-35AA-4C4E-B4E5-55818F98B554}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4E226D1F-35AA-4C4E-B4E5-55818F98B554}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4E226D1F-35AA-4C4E-B4E5-55818F98B554}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4E226D1F-35AA-4C4E-B4E5-55818F98B554}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

SharedLibrary/Models/RepositoryError.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SharedLibrary.Models
+{
+    public class RepositoryError 
+    {
+        public string Information { get; set; }
+        public string StackTrack { get; set; }
+    }
+}

SharedLibrary/Models/RepositoryException.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SharedLibrary.Models
+{
+    public class RepositoryException : Exception
+    {
+        
+    }
+}

SharedLibrary/SharedLibrary.csproj

@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

WebMVC/Controllers/ApiController.cs

@@ -1,5 +1,6 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Filters;
+using RepositoryLibrary;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -10,10 +11,21 @@ namespace WebMVC.Controllers
 {
     public class ApiController : Controller
     {
+        private readonly IRepository _repository;
+        public ApiController(IRepository repository)
+        {
+            _repository = repository;
+        }
         public override void OnActionExecuted(ActionExecutedContext context)
         {
-            // This is where I capture the error from the ApiService
+            // This is where I capture the error from when calling the ApiService
             base.OnActionExecuted(context);
         }
+
+        public async Task<IActionResult> Lookup()
+        {
+            var lookup = await _repository.Lookup();
+            return Ok(lookup);
+        }
     }
 }

WebMVC/Controllers/HomeController.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Logging;
+using RepositoryLibrary;
 using WebMVC.Models;
 
 namespace WebMVC.Controllers
@@ -12,10 +13,12 @@ namespace WebMVC.Controllers
     public class HomeController : Controller
     {
         private readonly ILogger<HomeController> _logger;
+        private readonly IRepository _repository;
 
-        public HomeController(ILogger<HomeController> logger)
+        public HomeController(ILogger<HomeController> logger, IRepository repository)
         {
             _logger = logger;
+            _repository = repository;
         }
 
         public IActionResult Index()
@@ -23,8 +26,13 @@ namespace WebMVC.Controllers
             return View();
         }
 
-        public IActionResult Privacy()
+        public async Task<IActionResult> Privacy()
         {
+            // To get this working, I have make a call here in the Privacy page.
+            // Making the call in the Home/Index page was always returning a 404 Not Found.
+            // The second project was not starting quickly enough.
+
+            var lookup = await _repository.Lookup();
             return View();
         }
 

WebMVC/Startup.cs

@@ -7,6 +7,7 @@ using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
+using RepositoryLibrary;
 
 namespace WebMVC
 {
@@ -19,13 +20,19 @@ namespace WebMVC
 
         public IConfiguration Configuration { get; }
 
-        // This method gets called by the runtime. Use this method to add services to the container.
         public void ConfigureServices(IServiceCollection services)
         {
             services.AddControllersWithViews();
+            if (false)
+            {
+                services.AddScoped<IRepository, LocalRepository>();
+            }
+            else
+            {
+                services.AddScoped<IRepository, HostedRepository>();
+            }
         }
 
-        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
         public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
         {
             if (env.IsDevelopment())
@@ -39,7 +46,21 @@ namespace WebMVC
             app.UseStaticFiles();
 
             app.UseRouting();
-
+            app.Use(async (context, next) =>
+            {
+                try
+                {
+                    await next();
+                }
+                catch (Exception ex)
+                {
+                    // Here I want to log the exception with the StackTrace.
+                    // The StackTrace when local is what I want
+                    // The StackTrace when Hosted is only to the Hosted. I'd 
+                    // like to see the StackTrace returned from ApiService.
+                    return;
+                }
+            });
             app.UseAuthorization();
 
             app.UseEndpoints(endpoints =>

WebMVC/WebMVC.csproj

@@ -4,4 +4,9 @@
     <TargetFramework>netcoreapp3.1</TargetFramework>
   </PropertyGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\RepositoryLibrary\RepositoryLibrary.csproj" />
+    <ProjectReference Include="..\SharedLibrary\SharedLibrary.csproj" />
+  </ItemGroup>
+
 </Project>