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Showing content from https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-mappings.html below:

Map API stages to a custom domain name for HTTP APIs

You use API mappings to connect API stages to a custom domain name. After you create a domain name and configure DNS records, you use API mappings to send traffic to your APIs through your custom domain name.

An API mapping specifies an API, a stage, and optionally a path to use for the mapping. For example, you can map the production stage of an API to https://api.example.com/orders.

You can map HTTP and REST API stages to the same custom domain name.

Before you create an API mapping, you must have an API, a stage, and a custom domain name. To learn more about creating a custom domain name, see Set up a Regional custom domain name in API Gateway.

You can configure API mappings with multiple levels, for example orders/v1/items and orders/v2/items.

For API mappings with multiple levels, API Gateway routes requests to the API mapping that has the longest matching path. API Gateway considers only the paths configured for API mappings, and not API routes, to select the API to invoke. If no path matches the request, API Gateway sends the request to the API that you've mapped to the empty path (none).

For custom domain names that use API mappings with multiple levels, API Gateway routes requests to the API mapping that has the longest matching prefix.

For example, consider a custom domain name https://api.example.com with the following API mappings:

1. (none) mapped to API 1.

2. orders mapped to API 2.

3. orders/v1/items mapped to API 3.

4. orders/v2/items mapped to API 4.

5. orders/v2/items/categories mapped to API 5.

https://api.example.com/orders

API 2

The request exactly matches this API mapping.

https://api.example.com/orders/v1/items

API 3

The request exactly matches this API mapping.

https://api.example.com/orders/v2/items

API 4

The request exactly matches this API mapping.

https://api.example.com/orders/v1/items/123

API 3

API Gateway chooses the mapping that has the longest matching path. The 123 at the end of the request doesn't affect the selection.

https://api.example.com/orders/v2/items/categories/5

API 5

API Gateway chooses the mapping that has the longest matching path.

https://api.example.com/customers

API 1

API Gateway uses the empty mapping as a catch-all.

https://api.example.com/ordersandmore

API 2

API Gateway chooses the mapping that has the longest matching prefix.

For a custom domain name configured with single-level mappings, such as only https://api.example.com/orders and https://api.example.com/, API Gateway would choose API 1, as there is no matching path with ordersandmore.

• In an API mapping, the custom domain name and mapped APIs must be in the same AWS account.

• API mappings must contain only letters, numbers, and the following characters: $-_.+!*'()/.

• The maximum length for the path in an API mapping is 300 characters.

• You can have 200 API mappings with multiple levels for each domain name. This limit doesn't include API mapping with single levels, such as /prod.

• You can only map HTTP APIs to a regional custom domain name with the TLS 1.2 security policy.

• You can't map WebSocket APIs to the same custom domain name as an HTTP API or REST API.

• If you create an API mappings with multiple levels, API Gateway converts all header names to lowercase.

To create an API mapping, you must first create a custom domain name, API, and stage. For information about creating a custom domain name, see Set up a Regional custom domain name in API Gateway.

For example AWS Serverless Application Model templates that create all resources, see Sessions With SAM on GitHub.

AWS Management Console

To create an API mapping

1. Sign in to the API Gateway console at https://console.aws.amazon.com/apigateway.

2. Choose Custom domain names.

3. Select a custom domain name that you've already created.

4. Choose API mappings.

5. Choose Configure API mappings.

6. Choose Add new mapping.

7. Enter an API, a Stage, and optionally a Path.

8. Choose Save.

AWS CLI

The following create-api-mapping command creates an API mapping. In this example, API Gateway sends requests to api.example.com/v1/orders to the specified API and stage.

aws apigatewayv2 create-api-mapping \
    --domain-name api.example.com \
    --api-mapping-key v1/orders \
    --api-id a1b2c3d4 \
    --stage test

AWS CloudFormation

The following AWS CloudFormation example creates an API mapping.

MyApiMapping:
  Type: 'AWS::ApiGatewayV2::ApiMapping'
  Properties:
    DomainName: api.example.com
    ApiMappingKey: 'orders/v2/items'
    ApiId: !Ref MyApi
    Stage: !Ref MyStage          
          

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