Dev iconDevAug 28, 2026 ~1 min source read

I Built a Small API Gateway With Real Production Problems — On Purpose

Most gateway tutorials stop at "here's how you route a request." That's the easy 20%. The hard part is what happens when a client hammers you with requests, a downstream service falls over mid-traffic, or you're staring at a 500 trying to figure out which of your four services actually caused it.

I Built a Small API Gateway With Real Production Problems — On Purpose

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Most gateway tutorials stop at "here's how you route a request." That's the easy 20%.

The hard part is what happens when a client hammers you with requests, a downstream service falls over mid-traffic, or you're staring at a 500 trying to figure out which of your four services actually...

I tried to make it behave like one вЂ" including the annoying bits, like config tradeoffs and races that most demos just quietly ignore.

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The useful part

Most gateway tutorials stop at "here's how you route a request." That's the easy 20%. The hard part is what happens when a client hammers you with requests, a downstream service falls over mid-traffic, or you're staring at a 500 trying to figure out which of your four services actually caused it. I tried to make it behave like one вЂ" including the annoying bits, like config tradeoffs and races that most demos just quietly ignore.

How it works

  • The gateway also checks an API key on top, because a JWT tells you who the user is, not which client a...

What to take from it

I wanted to build something that hits those problems on purpose, so I put together spring-gateway-sample: a public gateway, an api-server that fans out to two downstream services, and a full observability stack sitting behind all of it.

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