# How Amplify applies cache configuration to an app
<a name="cache-configuration-type"></a>

To manage caching for your app, Amplify determines the type of content that is being served by examining the app's platform type and rewrite rules. For `Compute` apps, Amplify also examines the routing rules in the deployment manifest.

**Note**  
The app's platform type is set by Amplify Hosting during deployment. An SSG (static) app is set to the platform type `WEB`. An SSR app (Next.js 12 or later) is set to the platform type `WEB_COMPUTE`.

Amplify identifies the following four types of content and applies the specified managed cache policy.

**Static**  
The content served from apps with the `WEB` platform, or the static routes in a `WEB_COMPUTE` app.  
This content uses the Amplify-StaticContent cache policy.

**Image Optimization**  
The images served by the `ImageOptimization` routes in a `WEB_COMPUTE` app.  
This content uses the Amplify-ImageOptimization cache policy.

**Compute**  
The content served by the `Compute` routes in a `WEB_COMPUTE` app. This includes all server-side rendered (SSR) content.  
This content uses either the Amplify-Default or Amplify-DefaultNoCookies cache policy depending on the value of `cacheConfig.type` that is set on your Amplify `App`.

**Reverse Proxy**  
The content served by paths that match a reverse proxy rewrite custom rule. For more information about creating this custom rule, see [Reverse proxy rewrite](redirect-rewrite-examples.md#reverse-proxy-rewrite) in the *Using redirects* chapter.  
This content uses either the Amplify-Default or Amplify-DefaultNoCookies cache policy depending on the value of `cacheConfig.type` that is set on your Amplify `App`.

## Understanding Amplify's managed cache policies
<a name="managed-cache-policies-amplify"></a>

Amplify uses the following predefined managed cache policies to optimize the default cache configuration for your hosted applications.
+ Amplify-Default
+ Amplify-DefaultNoCookies
+ Amplify-ImageOptimization
+ Amplify-StaticContent

### Amplify-Default managed cache policy settings
<a name="managed-cache-policy-amplify-default"></a>

[View this policy in the CloudFront console](https://console.aws.amazon.com/cloudfront/v4/home#/policies/cache/4d1d2f1d-3a71-49ad-9e08-7ea5d843a556)

This policy is designed for use with an origin that is an [AWS Amplify](https://aws.amazon.com/amplify/) web app.

This policy has the following settings:
+ **Minimum TTL:** 0 seconds
+ **Maximum TTL:** 31536000 seconds (one year)
+ **Default TTL:** 0 seconds
+ **Headers included in cache key:**
  + `Authorization`
  + `Accept`
  + `CloudFront-Viewer-Country`
  + `Host`
+ **Cookies included in cache key:** All cookies are included.
+ **Query strings included in cache key:** All query strings are included.
+ **Cache compressed objects setting:** Gzip and Brotli enabled.

### Amplify-DefaultNoCookies managed cache policy settings
<a name="managed-cache-policy-amplify-defaultnocookies"></a>

[View this policy in the CloudFront console](https://console.aws.amazon.com/cloudfront/v4/home#/policies/cache/a6bad946-36c3-4c33-aa98-362c74a7fb13)

This policy is designed for use with an origin that is an [AWS Amplify](https://aws.amazon.com/amplify/) web app.

This policy has the following settings:
+ **Minimum TTL:** 0 seconds
+ **Maximum TTL:** 31536000 seconds (one year)
+ **Default TTL:** 0 seconds
+ **Headers included in cache key:**
  + `Authorization`
  + `Accept`
  + `CloudFront-Viewer-Country`
  + `Host`
+ **Cookies included in cache key:** No cookies are included.
+ **Query strings included in cache key:** All query strings are included.
+ **Cache compressed objects setting:** Gzip and Brotli enabled.

### Amplify-ImageOptimization managed cache policy settings
<a name="managed-cache-policy-amplify-imageoptimization"></a>

[View this policy in the CloudFront console](https://console.aws.amazon.com/cloudfront/v4/home#/policies/cache/1c6db51a-a33f-469a-8245-dae26771f530)

This policy is designed for use with an origin that is an [AWS Amplify](https://aws.amazon.com/amplify/) web app.

This policy has the following settings:
+ **Minimum TTL:** 0 seconds
+ **Maximum TTL:** 31536000 seconds (one year)
+ **Default TTL:** 0 seconds
+ **Headers included in cache key:**
  + `Authorization`
  + `Accept`
  + `Host`
+ **Cookies included in cache key:** No cookies are included.
+ **Query strings included in cache key:** All query strings are included.
+ **Cache compressed objects setting:** Gzip and Brotli enabled.

### Amplify-StaticContent managed cache policy settings
<a name="managed-cache-policy-amplify-staticcontent"></a>

[View this policy in the CloudFront console](https://console.aws.amazon.com/cloudfront/v4/home#/policies/cache/7e5fad67-ee98-4ad0-b05a-394999eefc1a)

This policy is designed for use with an origin that is an [AWS Amplify](https://aws.amazon.com/amplify/) web app.

This policy has the following settings:
+ **Minimum TTL:** 0 seconds
+ **Maximum TTL:** 31536000 seconds (one year)
+ **Default TTL:** 0 seconds
+ **Headers included in cache key:**
  + `Authorization`
  + `Host`
+ **Cookies included in cache key:** No cookies are included.
+ **Query strings included in cache key:** No query strings are included.
+ **Cache compressed objects setting:** Gzip and Brotli enabled.