# API Gateway REST -> HTTP Migration

## HTTP API migration

* Duplicate the current stage config and rename the stage, and add the below extra config to support HTTP API, we'll use this new stage for HTTP deployment testing.

```json
{
  "dev_http": {
    ...
    "project_name": "project_name_http",
    "api_name": "api_name_http", # Only If this key present
    "use_http_api": true,
    ...
  }
}
```

* Update the env variables of the new lambda function deployed above.
* Update domain mapping to newly deployed API. See [Change Custom domain to regional endpoint](#change-custom-domain-to-regional-endpoint)
* Wait for some time to reflect the above API mapping changes (\~2 min)
* check whether the new HTTP API deployment is working properly, if you're unable to access the API try it in an incognito window.
* **Optional**: remove `domain` from `zappa_settings.json` in the original stage and undeploy the original/old REST API deployment using Zappa (`zappa undeploy <stage>`).

## Change Custom domain to regional endpoint

* Choose the custom domain name you want in the API gateway console.
* update TLS version to 1.2
* Now click on the configurations tab -> Edit -> add regional endpoint with your ACM certificate.
* update route53 record to "A type record" and point to above created regional endpoint API gateway domain name
* Delete the `Endpoint configuration (edge-optimized)` in the Configuration tab.
* Delete rest API mapping.
* Add mapping with newly deployed HTTP API
* Test the API again after sometime


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