Become an AWS pro by learning to run serverless applications with AWS Lambda. Developed by AWS Solution Certified Architects. Get hands-on, no setup, no cleanup, no hassle.

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In the world of modern development, serverless computing has become table stakes. Serverless computing has seen a major uptake with AWS Lambda having an increased adoption of 667% in 2018. Companies are making the switch to serverless for shorter time to market and decreased operational costs, but for you the advantage lies in the ability to offload the burden of managing infrastructure to serverless platforms, so you can focus on building even better apps.

In this course, you will learn how to run serverless applications using AWS Lambda. You’ll start with the basics such as creating a web service where you’ll learn the steps to deploy an AWS Serverless Application Model (SAM). You’ll then move on to more advanced topics such as handling HTTP Requests, using external storage, and managing sessions and user workflows. By the end of this course, you will be ready to work with AWS Lambda in a professional setting, and you’ll have a great, transferable skill that employers will love to see.

Running Serverless Applications with AWS Lambda

# Reasons for a generic error
API Gateway masks unhandled errors (such as a missing resources), with a `403 Not Authorized` response. If anything goes wrong when talking to the back-end service, you'll only see that error instead of useful troubleshooting information. This is great from a security perspective, because it prevents sensitive data leaks, but it's a major pain for troubleshooting problems. Here are just some of the cases when you'll see this generic error:

* If the request does not even reach the Lambda function, for example, due to misconfigured authorisation or resource configuration problems. 
* If the function blows up without returning a proper response.
* If the function returns a response that's not in the exact format that API Gateway expects.

# Using API Gateway to troubleshoot errors

The _Resources_ screen in the API Gateway Web Console is super useful for troubleshooting integration problems. When you get a 403 response and it's baffling you, navigate to the web console page for the API Gateway resource and click the _Test_ link in the _Client_ box (see the left side of the figure given below).

 



In this lesson, you will learn how to troubleshoot gateway integrations​ using the ​AWS Web Console. 

Troubleshooting Gateway Integrations

Getting Started

Setup Tools for Local Development

Creating a Web Service

Host a Serverless Application on AWS Lambda

Development and Troubleshooting

Core Features of AWS Lambda

Handling HTTP Requests

Using External Storage

Cheaper, Faster, Serverless

Handling Platform Events

Using Application Components

Managing Sessions and User Workflows

Designing Robust Applications

Deployment Options

Process Amazon SNS Notifications with AWS Lambda

Troubleshooting Gateway Integrations

Reasons for a generic error #