---
lang: en
title: 'API docs: http-caching-proxy'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/http-caching-proxy
permalink: /doc/en/lb4/apidocs.http-caching-proxy.html
---

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[Home](./index.md) &gt; [@loopback/http-caching-proxy](./http-caching-proxy.md)

## http-caching-proxy package

A caching HTTP proxy for integration tests.

## Remarks

\*\*NOT SUITABLE FOR PRODUCTION USE!\*\*

Testing applications connecting to backend REST/SOAP services can be difficult: The backend service may be slow, apply rate limiting, etc. Integration tests become too slow in such case, which makes test-first development impractical.

This can be addressed by setting up a snapshot-based mock server or using a caching HTTP client, but both of these solutions come with severe disadvantages:

- When using a snapshot-based mock server, we must ensure that snapshots are up-to-date with the actual backend implementation. - Caching at HTTP-client side requires non-trivial changes of the application code.

A filesystem-backed caching HTTP proxy offers a neat solution that combines caching and snapshots:

- The first request is forwarded to the actual backend and the response is stored as a snapshot. - Subsequent requests are served by the proxy using the cached snaphost. - Snapshot older than a configured time are discarded and the first next request will fetch the real response from the backend.

## Classes

|  Class | Description |
|  --- | --- |
|  [HttpCachingProxy](./http-caching-proxy.httpcachingproxy.md) | The HTTP proxy implementation. |

## Interfaces

|  Interface | Description |
|  --- | --- |
|  [ProxyOptions](./http-caching-proxy.proxyoptions.md) |  |


