Description of changes:
Add the support to custom domain described in aws configuration. Existing functionality of appsync generated domains (with 26 char host) is not changed.
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Issue #, if available:
Description of changes: Add the support to custom domain described in aws configuration. Existing functionality of appsync generated domains (with 26 char host) is not changed.
By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.