Dylan Sather (Pipedream) : Great thanks. Pipedream is not purpose-built for hosting websites, so you may get more mileage using tools like Vercel or Netlify (for example). Then the form submission on the site can initiate an HTTP POST request that triggers the Pipedream workflow.
But for simple use cases you can host HTML on Pipedream by using the $respond function: https://pipedream.com/community/t/how-do-i-send-a-custom-http-response-from-a-workflow-step/955/3?u=dylburger . If you choose the HTTP API trigger, and include code like that in a workflow, any HTTP request to your endpoint will return that HTML.
Since you have access to the HTTP method of the incoming request, you can also conditionally respond with HTML only when a GET request is made. When POST requests are made, you could instead process the incoming payload. That allows a single Pipedream workflow to both host the HTML and process its data.
Since you can run any Node.js code, truly anything is possible, but I hope that gives you some general guidance. Let me know if that helps!