dotnet add package AWSLambda.AspNetCoreAppMesh --version                
NuGet\Install-Package AWSLambda.AspNetCoreAppMesh -Version                
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="AWSLambda.AspNetCoreAppMesh" Version="" />                
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add AWSLambda.AspNetCoreAppMesh --version                
#r "nuget: AWSLambda.AspNetCoreAppMesh,"                
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install AWSLambda.AspNetCoreAppMesh as a Cake Addin
#addin nuget:?package=AWSLambda.AspNetCoreAppMesh&version=

// Install AWSLambda.AspNetCoreAppMesh as a Cake Tool
#tool nuget:?package=AWSLambda.AspNetCoreAppMesh&version=                

Amazon Lambda ASP.NET Core App Mesh

You have a fleet of serverless ASP.NET Core apps configured as AWS Lambda functions. While AmazonLambdaClient.InvokeAsync() found in the AWSSDK.Lambda is a one way to achieve inter-Lambda communication, the method does not work for invocation of Lambdas running on your local machine. This library aims to fill this functionality gap by marshalling your requests using Kestrel when your ASP.NET Core lambdas are being debugged locally.


  • Catalog clients: auto-discover the catalog tool url (assess feasibility)
  • Support for Lambdas deployed behind an ALB


Say you have an existing Invoke code such as this:

var invokeReq = new InvokeRequest();
invokeReq.FunctionName = "MyLambdaFunction";
invokeReq.InvocationType = InvocationType.RequestResponse;
// ... other params

var apiGatewayReq = new APIGatewayProxyRequest()
    HttpMethod = "GET",
    Path = "/home/index"

invokeReq.Payload = JsonSerializer.Serialize(apiGatewayReq);

var lambdaClient = new AmazonLambdaClient(); // region, creds

var resp = await lambdaClient.InvokeAsync(invokeReq); // When running in AWS environment

// This will route the request to MyLambdaFunction running on your local machine

resp = await invokeReq.RouteAPIGatewayProxyRequestLocally();

Getting Started

Catalog Tool Installation

Catalog Tool keeps track of all the running Lambda ASP.NET Core Applications on your local machine that register to recieve incoming InvokeRequest requests.

dotnet tool install -g AWSLambda.AspNetCoreAppMesh.Catalog

/* or to update */

dotnet tool update -g AWSLambda.AspNetCoreAppMesh.Catalog

Run the Catalog Tool

dotnet lambda-app-mesh --urls http://localhost:5050

The --urls param is optional. The tool will listen on port 5000 and 5001 by default.

Once the Catalog Tool is running, your ASP.NET Core applications will be able to register themselves with the catalog. Ensure the catalog url is resolvable and reachable by your applications.

See full Catalog Tool Documentation

Configuring Your ASP.NET Core Application to route InvokeRequest objects locally

In Startup.cs

public void ConfigureServices(IServiceCollection services)
	services.AddAWSLambdaAppMeshClient(opts =>
		opts.LambdaName = "MyAspNetCoreLambda"; // name of your Lambda function
		opts.CatalogUrl = "http://localhost:5050"; // URL the Catalog Tool (dotnet lambda-app-mesh) is listening on

public void Configure(IApplicationBuilder app, IHostingEnvironment env)

Now, you can call RouteAPIGatewayProxyRequestLocally() on your InvokeRequest requests. In order for InvokeRequest to be processed, the receiver ASP.NET Core Lambda must be running on your machine, and must have registered with the Catalog tool.

Configuring Your ASP.NET Core Application to receive incoming InvokeRequest requests

It is assumed that your ASP.NET Core Lambda applications are configured to run using Kestrel when debugging locally. If you are running the app using IIS or IIS Express then the incoming requests will fail to process properly.

Ensure the Catalog Tool (dotnet lambda-app-mesh) is running prior to launching your ASP.NET Core apps. Otherwise, you'll get an exception when trying to register with the catalog.

In Startup.cs

public void ConfigureServices(IServiceCollection services)
	services.AddAPIGatewayProxyFunctionEntryPoint<LambdaEntryPoint>(); // your APIGatewayProxyFunction entry point

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp3.1 is compatible. 
Compatible target framework(s)
Included target framework(s) (in package)
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Version Downloads Last updated 766 4/1/2020
1.0.6 549 4/1/2020
1.0.5 564 3/4/2020
1.0.4 572 2/29/2020
1.0.3 549 2/29/2020
1.0.2 571 2/29/2020
1.0.2-rc 466 2/29/2020
1.0.1 576 2/29/2020

v1.0.6 - .NET Core 3.1 support (coinciding with
v1.0.5 - Corrected a few error messages
v1.0.4 - Fixed issue with circular host registration
v1.0.3 - Improved ApplicationUrl discovery
v1.0.2 - Friendlier error messages
v1.0.1 - Intital Release