Explaining the gRPC Myth: Here's What Happens to HTTP at 100 Concurrent Threads

I used to buy into the generic developer hype: "gRPC is 10x faster than HTTP, it just has some configuration overhead."

While technically true on paper, running a comprehensive stress test on my own system revealed a much more pragmatic reality.

When building my Architecture-Boilerplate `headsntails` (Golang-based infrastructure which, in its current state, serves as a plug-and-play Feature Flag Service and is able to scale up to SaaS out of the box), our public endpoint validates every incoming request against a cart `rate-limiter` service.

Originally, this intranet communication ran over standard HTTP. Recognizing this as a potential bottleneck, I set out to replace (and benchmark) it with gRPC in v0.3.

Rather than blindly ripping and replacing, I implemented a simple configuration flag (`RATE_LIMITER_USE_GRPC=true|false`) and spun up a Fortio load-testing container to stress-test both protocols under the exact same conditions.

Here is what happened when I pushed...

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