Amazon API Gateway 支援壓縮了：「Amazon API Gateway Supports Content Encoding for API Responses」。
You can now enable content encoding support for API Responses in Amazon API Gateway. Content encoding allows API clients to request content to be compressed before being sent back in the response to an API request. This reduces the amount of data that is sent from API Gateway to API clients and decreases the time it takes to transfer the data. You can enable content encoding in the API definition. You can also set the minimum response size that triggers compression. By default, APIs do not have content encoding support enabled.
打開後傳回的資料就會自動壓縮了，然後還可以設定觸發的 response size... 依照文件 (Content Codings Supported by API Gateway)，目前支援的壓縮格式應該是最常見的
這功能好像是一開始有 API Gateway 就一直被提出來的 feature request...