Enable devcontainers in repo.

.devcontainer/devcontainer.json

@@ -0,0 +1,94 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/dotnet
+{
+	"name": "C# (.NET)",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/dotnet:1-9.0",
+	"features": {
+		"ghcr.io/devcontainers/features/azure-cli:1": {},
+		"ghcr.io/azure/azure-dev/azd:0": {},
+		"ghcr.io/devcontainers/features/docker-in-docker": {},
+		"ghcr.io/devcontainers/features/dotnet": {
+			"additionalVersions": [
+				"8.0.403"
+			]
+		}
+	},
+
+	"hostRequirements": {
+		"cpus": 8,
+		"memory": "32gb",
+		"storage": "64gb"
+	},
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [
+		15887,
+		5180,
+		7024,
+		15551,
+		33803,
+		5350,
+		41567,
+		15306
+	],
+	"portsAttributes": {
+		"5180": {
+			"label": "WaitFor Playground: ApiService",
+			"protocol": "http"
+		},
+		"5350": {
+			"label": "Redis Playground: Api Service"
+		},
+		"7024": {
+			"label": "WaitFor Playground: Frontend",
+			"protocol": "https"
+		},
+		"15306": {
+			"label": "Redis Playground: App Host"
+		},
+		"15551": {
+			"label": "WaitFor Playground: PGAdmin",
+			"protocol": "http"
+		},
+		"15887": {
+			"label": "WaitFor Playground: AppHost",
+			"protocol": "https"
+		},
+		"33803": {
+			"label": "Redis Playground: Redis Commander"
+		},
+		"41567": {
+			"label": "Redis Playground: Redis Insight"
+		}
+	},
+	"otherPortsAttributes": {
+		"onAutoForward": "ignore"
+	},
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"ms-dotnettools.csdevkit",
+				"ms-azuretools.vscode-bicep",
+				"ms-azuretools.azure-dev"
+			],
+			"settings": {
+				"remote.autoForwardPorts": false,
+				"dotnet.defaultSolution": "Aspire.sln"
+			}
+		}
+	},
+	"onCreateCommand": "dotnet restore",
+	"postStartCommand": "dotnet dev-certs https --trust"
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

playground/Redis/Redis.AppHost/Program.cs

@@ -2,8 +2,8 @@
 
 var redis = builder.AddRedis("redis")
     .WithDataVolume()
-    .WithRedisCommander()
-    .WithRedisInsight();
+    .WithRedisCommander(c => c.WithHostPort(33803))
+    .WithRedisInsight(c => c.WithHostPort(41567));
 
 var garnet = builder.AddGarnet("garnet")
     .WithDataVolume();

playground/waitfor/WaitForSandbox.AppHost/Program.cs

@@ -7,7 +7,10 @@
                 .WithPasswordAuthentication()
                 .RunAsContainer(c =>
                 {
-                    c.WithPgAdmin();
+                    c.WithPgAdmin(c =>
+                    {
+                        c.WithHostPort(15551);
+                    });
                 })
                 .AddDatabase("db");
 

src/Aspire.Hosting.PostgreSQL/PostgresBuilderExtensions.cs

@@ -6,6 +6,7 @@
 using Aspire.Hosting.ApplicationModel;
 using Aspire.Hosting.Postgres;
 using Aspire.Hosting.Utils;
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace Aspire.Hosting;
@@ -333,6 +334,16 @@ private static void SetPgAdminEnvironmentVariables(EnvironmentCallbackContext co
         // You need to define the PGADMIN_DEFAULT_EMAIL and PGADMIN_DEFAULT_PASSWORD or PGADMIN_DEFAULT_PASSWORD_FILE environment variables.
         context.EnvironmentVariables.Add("PGADMIN_DEFAULT_EMAIL", "[email protected]");
         context.EnvironmentVariables.Add("PGADMIN_DEFAULT_PASSWORD", "admin");
+
+        // When running in the context of Codespaces we need to set some additional environment
+        // varialbes so that PGAdmin will trust the forwarded headers that Codespaces port
+        // forwarding will send.
+        var config = context.ExecutionContext.ServiceProvider.GetRequiredService<IConfiguration>();
+        if (context.ExecutionContext.IsRunMode && config.GetValue<bool>("CODESPACES", false))
+        {
+            context.EnvironmentVariables["PGADMIN_CONFIG_PROXY_X_HOST_COUNT"] = "1";
+            context.EnvironmentVariables["PGADMIN_CONFIG_PROXY_X_PREFIX_COUNT"] = "1";
+        }
     }
 
     /// <summary>

src/Aspire.Hosting/Codespaces/CodespacesOptions.cs

@@ -0,0 +1,66 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Diagnostics.CodeAnalysis;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Options;
+
+namespace Aspire.Hosting.Codespaces;
+
+/// <summary>
+/// GitHub Codespaces configuration values.
+/// </summary>
+internal class CodespacesOptions
+{
+    /// <summary>
+    /// When set to true, the app host is running in a GitHub Codespace.
+    /// </summary>
+    /// <remarks>
+    /// Maps to the CODESPACE environment variable.
+    /// </remarks>
+    public bool IsCodespace { get; set; }
+
+    /// <summary>
+    /// When set it is the domain suffix used when port forwarding services hosted on the Codespace.
+    /// </summary>
+    /// <remarks>
+    /// Maps to the GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN environment variable.
+    /// </remarks>
+    [MemberNotNullWhen(true, nameof(IsCodespace))]
+    public string? PortForwardingDomain { get; set; }
+
+    /// <summary>
+    /// When set it is the name of the GitHub Codespace in which the app host is running.
+    /// </summary>
+    /// <remarks>
+    /// Maps to the CODESPACE_NAME environment variable.
+    /// </remarks>
+    [MemberNotNullWhen(true, nameof(IsCodespace))]
+    public string? CodespaceName { get; set; }
+}
+
+internal class ConfigureCodespacesOptions(IConfiguration configuration) : IConfigureOptions<CodespacesOptions>
+{
+    private const string CodespacesEnvironmentVariable = "CODESPACES";
+    private const string CodespaceNameEnvironmentVariable = "CODESPACE_NAME";
+    private const string GitHubCodespacesPortForwardingDomain = "GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN";
+
+    private string GetRequiredCodespacesConfigurationValue(string key)
+    {
+        ArgumentNullException.ThrowIfNullOrEmpty(key);
+        return configuration.GetValue<string>(key) ?? throw new DistributedApplicationException($"Codespaces was detected but {key} environment missing.");
+    }
+
+    public void Configure(CodespacesOptions options)
+    {
+        if (!configuration.GetValue<bool>(CodespacesEnvironmentVariable, false))
+        {
+            options.IsCodespace = false;
+            return;
+        }
+
+        options.IsCodespace = true;
+        options.PortForwardingDomain = GetRequiredCodespacesConfigurationValue(GitHubCodespacesPortForwardingDomain);
+        options.CodespaceName = GetRequiredCodespacesConfigurationValue(CodespaceNameEnvironmentVariable);
+    }
+}

src/Aspire.Hosting/Codespaces/CodespacesUrlRewriter.cs

@@ -3,35 +3,22 @@
 
 using System.Collections.Immutable;
 using Aspire.Hosting.ApplicationModel;
-using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
 
 namespace Aspire.Hosting.Codespaces;
 
-internal sealed class CodespacesUrlRewriter(ILogger<CodespacesUrlRewriter> logger, IConfiguration configuration, ResourceNotificationService resourceNotificationService) : BackgroundService
+internal sealed class CodespacesUrlRewriter(ILogger<CodespacesUrlRewriter> logger, IOptions<CodespacesOptions> options, ResourceNotificationService resourceNotificationService) : BackgroundService
 {
-    private const string CodespacesEnvironmentVariable = "CODESPACES";
-    private const string CodespaceNameEnvironmentVariable = "CODESPACE_NAME";
-    private const string GitHubCodespacesPortForwardingDomain = "GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN";
-
-    private string GetRequiredCodespacesConfigurationValue(string key)
-    {
-        ArgumentNullException.ThrowIfNullOrEmpty(key);
-        return configuration.GetValue<string>(key) ?? throw new DistributedApplicationException($"Codespaces was detected but {key} environment missing.");
-    }
-
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
     {
-        if (!configuration.GetValue<bool>(CodespacesEnvironmentVariable, false))
+        if (!options.Value.IsCodespace)
         {
             logger.LogTrace("Not running in Codespaces, skipping URL rewriting.");
             return;
         }
 
-        var gitHubCodespacesPortForwardingDomain = GetRequiredCodespacesConfigurationValue(GitHubCodespacesPortForwardingDomain);
-        var codespaceName = GetRequiredCodespacesConfigurationValue(CodespaceNameEnvironmentVariable);
-
         do
         {
             try
@@ -58,7 +45,7 @@ protected override async Task ExecuteAsync(CancellationToken stoppingToken)
                                 // which is typically ".app.github.dev". The VSCode instance is typically
                                 // hosted at codespacename.github.dev whereas the forwarded ports
                                 // would be at codespacename-port.app.github.dev.
-                                Url = $"{uri.Scheme}://{codespaceName}-{uri.Port}.{gitHubCodespacesPortForwardingDomain}{uri.AbsolutePath}"
+                                Url = $"{uri.Scheme}://{options.Value.CodespaceName}-{uri.Port}.{options.Value.PortForwardingDomain}{uri.AbsolutePath}"
                             };
 
                             remappedUrls.Add(originalUrlSnapshot, newUrlSnapshot);

src/Aspire.Hosting/DistributedApplicationBuilder.cs

@@ -269,6 +269,7 @@ public DistributedApplicationBuilder(DistributedApplicationOptions options)
             _innerBuilder.Services.AddSingleton<IKubernetesService, KubernetesService>();
 
             // Codespaces
+            _innerBuilder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IConfigureOptions<CodespacesOptions>, ConfigureCodespacesOptions>());
             _innerBuilder.Services.AddHostedService<CodespacesUrlRewriter>();
 
             Eventing.Subscribe<BeforeStartEvent>(BuiltInDistributedApplicationEventSubscriptionHandlers.InitializeDcpAnnotations);

tests/Aspire.Hosting.Tests/Codespaces/CodespacesUrlRewriterTests.cs

@@ -15,6 +15,10 @@ public class CodespacesUrlRewriterTests(ITestOutputHelper testOutputHelper)
     public async Task VerifyUrlsRewriterStopsWhenNotInCodespaces()
     {
         using var builder = TestDistributedApplicationBuilder.Create(testOutputHelper);
+
+        // Explicitly disable codespace behavior for this test.
+        builder.Configuration["CODESPACES"] = "false";
+
         builder.Services.AddLogging(logging =>
         {
             logging.AddFakeLogging();