REST vs. HTTP APIs. REST has a maximum of 29 while HTTP has a maximum of 30.
For REST, it is listed in the Integration, select the METHOD (GET for example), then on the bottom, there is "Use Default Timeout". Unselect it and you should be able to change the custom timeout between 50ms to 29s.
For HTTP, it is under Integration Details, Advanced Settings.
REST is also known as v1, and HTTP is known as V2. API Gateway HTTP APIs is not at parity with REST, but has better latency, cheaper, and will be the future. More parity features will be forthcoming.
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