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Core Functions

Main functions for handling POST data in Shiny

payload_ui()
Wrap an existing UI with an integrated POST handler on the same port
payload_last()
Get a reactive that polls for new payload data
params_get()
Get URL query parameters in Shiny
payload_endpoint_url()
Generate the absolute URL for the payload endpoint
setup_payload_endpoint()
Setup POST endpoint in server function - MUST be called in server