Repository: vercel/next.js
Pull request: Update caching.mdx

Updating caching guide to be more specific on fetch API. Solves https://github.com/vercel/next.js/issues/81183 

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Changed files:
filename: docs/01-app/02-guides/caching.mdx
patch: @@ -376,24 +376,24 @@ When configuring the different caching mechanisms, it's important to understand
 
 The following table provides an overview of how different Next.js APIs affect caching:
 
-| API                                                                     | Router Cache               | Full Route Cache      | Data Cache            | React Cache |
-| ----------------------------------------------------------------------- | -------------------------- | --------------------- | --------------------- | ----------- |
-| [`<Link prefetch>`](#link)                                              | Cache                      |                       |                       |             |
-| [`router.prefetch`](#routerprefetch)                                    | Cache                      |                       |                       |             |
-| [`router.refresh`](#routerrefresh)                                      | Revalidate                 |                       |                       |             |
-| [`fetch`](#fetch)                                                       |                            |                       | Cache                 | Cache       |
-| [`fetch` `options.cache`](#fetch-optionscache)                          |                            |                       | Cache or Opt out      |             |
-| [`fetch` `options.next.revalidate`](#fetch-optionsnextrevalidate)       |                            | Revalidate            | Revalidate            |             |
-| [`fetch` `options.next.tags`](#fetch-optionsnexttags-and-revalidatetag) |                            | Cache                 | Cache                 |             |
-| [`revalidateTag`](#fetch-optionsnexttags-and-revalidatetag)             | Revalidate (Server Action) | Revalidate            | Revalidate            |             |
-| [`revalidatePath`](#revalidatepath)                                     | Revalidate (Server Action) | Revalidate            | Revalidate            |             |
-| [`const revalidate`](#segment-config-options)                           |                            | Revalidate or Opt out | Revalidate or Opt out |             |
-| [`const dynamic`](#segment-config-options)                              |                            | Cache or Opt out      | Cache or Opt out      |             |
-| [`cookies`](#cookies)                                                   | Revalidate (Server Action) | Opt out               |                       |             |
-| [`headers`, `searchParams`](#dynamic-apis)                              |                            | Opt out               |                       |             |
-| [`generateStaticParams`](#generatestaticparams)                         |                            | Cache                 |                       |             |
-| [`React.cache`](#react-cache-function)                                  |                            |                       |                       | Cache       |
-| [`unstable_cache`](/docs/app/api-reference/functions/unstable_cache)    |                            |                       | Cache                 |             |
+| API                                                                     | Router Cache               | Full Route Cache      | Data Cache            | React Cache          |
+| ----------------------------------------------------------------------- | -------------------------- | --------------------- | --------------------- | -------------------- |
+| [`<Link prefetch>`](#link)                                              | Cache                      |                       |                       |                      |
+| [`router.prefetch`](#routerprefetch)                                    | Cache                      |                       |                       |                      |
+| [`router.refresh`](#routerrefresh)                                      | Revalidate                 |                       |                       |                      |
+| [`fetch`](#fetch)                                                       |                            |                       | Cache                 | Cache (GET and HEAD) |
+| [`fetch` `options.cache`](#fetch-optionscache)                          |                            |                       | Cache or Opt out      |                      |
+| [`fetch` `options.next.revalidate`](#fetch-optionsnextrevalidate)       |                            | Revalidate            | Revalidate            |                      |
+| [`fetch` `options.next.tags`](#fetch-optionsnexttags-and-revalidatetag) |                            | Cache                 | Cache                 |                      |
+| [`revalidateTag`](#fetch-optionsnexttags-and-revalidatetag)             | Revalidate (Server Action) | Revalidate            | Revalidate            |                      |
+| [`revalidatePath`](#revalidatepath)                                     | Revalidate (Server Action) | Revalidate            | Revalidate            |                      |
+| [`const revalidate`](#segment-config-options)                           |                            | Revalidate or Opt out | Revalidate or Opt out |                      |
+| [`const dynamic`](#segment-config-options)                              |                            | Cache or Opt out      | Cache or Opt out      |                      |
+| [`cookies`](#cookies)                                                   | Revalidate (Server Action) | Opt out               |                       |                      |
+| [`headers`, `searchParams`](#dynamic-apis)                              |                            | Opt out               |                       |                      |
+| [`generateStaticParams`](#generatestaticparams)                         |                            | Cache                 |                       |                      |
+| [`React.cache`](#react-cache-function)                                  |                            |                       |                       | Cache                |
+| [`unstable_cache`](/docs/app/api-reference/functions/unstable_cache)    |                            |                       | Cache                 |                      |
 
 ### `<Link>`
 
@@ -573,7 +573,7 @@ To disable caching at request time, add the `export const dynamicParams = false`
 
 The React `cache` function allows you to memoize the return value of a function, allowing you to call the same function multiple times while only executing it once.
 
-Since `fetch` requests are automatically memoized, you do not need to wrap it in React `cache`. However, you can use `cache` to manually memoize data requests for use cases when the `fetch` API is not suitable. For example, some database clients, CMS clients, or GraphQL clients.
+`fetch` requests using the `GET` or `HEAD` methods are automatically memoized, so you do not need to wrap it in React `cache`. However, for other `fetch` methods, or when using data fetching libraries (such as some database, CMS, or GraphQL clients) that don't inherently memoize requests, you can use `cache` to manually memoize data requests.
 
 ```ts filename="utils/get-item.ts" switcher
 import { cache } from 'react'