SurveyJS - 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.
surveyjs.io
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SurveyJS
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.
I don't know if you can do this directly in nginx config but you can definitely do it with njs. This github repo has some examples of how njs is used to do things during in-flight request: https://github.com/nginx/njs-examples. Also I think the variable you are looking for is $proxy_port (http://nginx.org/en/docs/varindex.html)
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