I built an HTTP caching proxy with an admin panel | here's why and how

proxycaching — Fri, 29 May 2026 17:19:56 +0000

If you have ever built automated data tools, integration pipelines, or local test suites that rely on third-party services, you already know the frustration. You run your tests, tweak a line of code, run them again, and suddenly you are staring at a rate-limit error. Or worse, you check your billing dashboard and realize you just burned through a chunk of real cash on pay-per-use API credits in a single afternoon.

When we were developing complex automation and data aggregation systems, this became a massive bottleneck for us. Every single local test run required fetching the exact same data over and over. It drained our API quotas, slowed down our development cycles due to network latency, and was getting incredibly expensive.

That is why we decided to build a lightweight HTTP and HTTPS proxy cache server tailored specifically for development and testing workflows. Beyond just saving time, our main goal was to stop wasting money on paid APIs during the building and prototyping phase.

The Core Problem With Existing Tools

When you look at production-grade proxies, they are usually bloated, complicated to set up, and definitely not built for a quick local development workflow. On the other side, traditional mocking libraries require you to manually write and maintain fake data files inside your code, which quickly become outdated as remote APIs change.

We wanted a true drop-in utility. We needed something that sits quietly in the background, intercepting traffic and serving repeated calls from a local disk cache instead of executing the request over the internet every single time.

What This Proxy Safely Handles

Instead of diving into a boring configuration manual, here is a high-level look at how this tool changes the way we build and test software:

Smart Request Replaying: The first time your app calls an external API, the proxy fetches it normally. The second time, it serves it instantly from your local disk. This reduces your dependency on live services and makes your local test runs fast.
Seamless HTTPS Interception: Intercepting encrypted traffic is usually a massive pain involving tedious certificate management. We built this tool to automatically handle the heavy lifting by creating and managing a local Certificate Authority on the fly.
An Admin Panel for Total Visibility: A proxy operating in the dark is a debugging nightmare. To fix this, we built a clean web-based admin interface. You can open it right in your browser to inspect active cache rules, view cached entries, and check the health of your local setup in real-time.

The Ultimate Impact on Our Workflow

Building this tool completely transformed how we approach integration testing. We no longer have to worry about running up massive bills on pay-per-use APIs while debugging a minor loop in our code. If a remote service goes down or becomes painfully slow, our local development experience remains completely stable and completely unaffected.

It turns caching from a manual coding chore into a simple infrastructure utility. If you are tired of hitting rate limits and burning through your budget while just trying to test your code, introducing a local caching layer is a total game-changer.

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DEV Community: proxycaching

I built an HTTP caching proxy with an admin panel | here's why and how

The Core Problem With Existing Tools

What This Proxy Safely Handles

The Ultimate Impact on Our Workflow