![]() Do not call ConfigureWebHostDefaults when overriding Init(IHostBuilder) because will call ConfigureWebHostDefaults when creating the IHostBuilder. To customize the IHostBuilder then override the Init(IHostBuilder). The most common customization is to override the Init(IWebHostBuilder) method and set the startup class via the UseStartup method. There are two Init methods that can be overridden to customize the IHostBuilder. public static IHostBuilder CreateHostBuilder(string args) =>Ī creates this IHostBuilder and configures all of the default settings needed to run the ASP.NET Core application in Lambda. As part of creating the IHostBuilder an IWebHostBuilder is created by the ConfigureWebHostDefaults method. In a typical ASP.NET Core 3.1 application the Program.cs file will bootstrap the application using IHostBuilder like the following snippet shows. ASP.NET Core 3.1ĪSP.NET Core 3.1 uses the generic IHostBuilder to bootstrap the application. With there are multiple options for customizing the bootstrapping and they vary between targeted versions of. ![]() The host builder is used to configure all of the required services needed to run the ASP.NET Core application. Bootstrapping application (IWebHostBuilder vs IHostBuilder)ĪSP.NET Core applications are bootstrapped by using a host builder. The function handler for the Lambda function will be TestWebApp::TestWebApp.LambdaEntryPoint::FunctionHandlerAsync. Protected override void Init(IWebHostBuilder builder) ![]() / needs to be configured in this method using the UseStartup() method. / The builder has configuration, logging and Amazon API Gateway already configured. will be the default and you must make 2ProxyFunction the base class.Ī Note: When using the AWS::Serverless::Function resource with an event type of "HttpApi" then payload version 2.0 API Gateway HTTP API payload version 2.0 -> 2ProxyFunction API Gateway HTTP API payload version 1.0 -> will fail to convert the incoming request correctly into a valid ASP.NET Core request. The base class must be set to match the AWS service invoking the Lambda function. / AWSServerless19::AWSServerless19.LambdaEntryPoint::FunctionHandlerAsync The Lambda handler field should be set to / This class extends from APIGatewayProxyFunction which contains the method FunctionHandlerAsync which is the Here is an example implementation of the Lamba function in an ASP.NET Core Web API application. Note: HTTP API default to payload 2.0 so unless 1.0 is explicitly set the base class should be APIGatewayHttpApiV2ProxyFunction. The base class is determined based on where the Lambda functions will be invoked from. In the ASP.NET Core application add a class that will be the entry point for Lambda to call into the application. The function takes a request from an API Gateway ProxyĪnd converts that request into the classes the ASP.NET Core framework expects and then converts the response from the ASP.NET Coreįramework into the response body that API Gateway Proxy or Application Load Balancer understands. NET Core developers toĬreate "serverless" applications using the ASP.NET Core Web API framework. This package makes it easy to run ASP.NET Core Web API applications as a Lambda function with API Gateway or an ELB Application Load Balancer.
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