Understanding the Role of an API Gateway in Microservice Architectures
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TechieMaverick789
I'm trying to wrap my head around what an API Gateway does, especially in the context of a microservice architecture. Is it accurate to say that an API Gateway serves as a middleman, directing requests to the appropriate service? Also, could it potentially eliminate the need for me to build a custom backend from scratch, managing things like caching, DDoS protection, and rate limiting? And regarding authorization, is it possible to create custom middleware for user authorization? Essentially, I'm looking for guidance on when to opt for an API Gateway versus building a custom backend, like in .NET or Express.
Answers
I've been using API Gateway for about six years with my live service. It makes request routing and filtering super simple, and it supports multiple backends seamlessly. Plus, it’s great for authenticating users across all these services. It's saved me a ton of work by not having to set up everything from scratch.
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The API Gateway acts as a single entry point for your services. It can handle DDoS protection via AWS Shield, and think of it like an enhanced load balancer that also brings extra features to the table. You can write custom authorization logic using Lambda, known as authorizers, which can help manage user access.
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Absolutely! You can configure the API Gateway to forward requests to your .NET Lambda functions. It does come with built-in authorization options, but most likely you will need a custom authorization logic as a Lambda, which is pretty straightforward.
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If you need a unified endpoint that handles things like authorization, caching, user throttling, and more, then API Gateway is the way to go. Many companies find it invaluable for these features.
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The best way to view it is as a requirement to expose your AWS Lambda functions as public services. You’re not able to do that directly; API Gateway is necessary to create an accessible HTTP endpoint for your internal Lambdas.
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