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Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
The best way I've found to locate the X-Amz-Target value is from this AWS support ticket where it is recommend to look at the SDK docs for the service and locate the targetPrefix field in the metadata.
Back in early 2021, I gave a talk at a Nimbella (now Digital Ocean) conference about power tuning your serverless APIs for happy customers. There were several optimization points in there, but the key takeaway I wanted people to remember was that API Gateway connects directly to AWS services.