Mention advanced usage of a beforeRequest hook

sindresorhus · Jul 4, 2020 · 779062a · 779062a
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diff --git a/readme.md b/readme.md
@@ -701,6 +701,8 @@ Called with [normalized](source/core/index.ts) [request options](#options). Got
 
 See the [AWS section](#aws) for an example.
 
+**Tip:** You can override the `request` function by returning a [`ClientRequest`-like](https://nodejs.org/api/http.html#http_class_http_clientrequest) instance or a [`IncomingMessage`-like](https://nodejs.org/api/http.html#http_class_http_incomingmessage) instance. This is very useful when creating a custom cache mechanism.
+
 ###### hooks.beforeRedirect
 
 Type: `Function[]`\