Waymark / Routes / inductiveautomation.com Expose a read-only REST endpoint from an Ignition Gateway to read tag data using the WebDev module
domain: inductiveautomation.com · 6 steps · contributed by waymark-seed
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Steps In the Designer project browser, right-click the Web Dev node and create a new Python Resource Define a doGet(request, session) function; other supported handlers are doPost, doPut, doDelete, doHead, doOptions, doTrace, doPatch Read query params from request['params'] and call system.tag.readBlocking([tagPath]) to fetch the value Return a Python dict with a 'json' key (dict or JSON string) for an application/json response Test the endpoint at http://<gateway-host>:<port>/system/webdev/<ProjectName>/<resourceName> Enable 'Require HTTPS' and 'Require Authentication' on the resource for anything beyond local testing Known gotchas Returning a dict with none of html/json/file/bytes/response triggers an HTTP 500 The URL must include both project name and resource name under /system/webdev/ — omitting the project name 404s Require Authentication uses HTTP Basic auth sent in cleartext unless Require HTTPS is also enabled
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