GET-to-POST form bridge for ASP.NET WebForms endpoints. Point it at a results page, and it fetches the page's hidden inputs (__VIEWSTATE, __EVENTVALIDATION, …), echoes your query parameters as form fields, and auto-submits the POST.
GET /api?action=<urlencoded target>&fetchhidden=1&ctl00$edtSearch=bellville&…
| Param | Meaning |
|---|---|
action | (required) URL-encoded target URL the generated form POSTs to |
fetchhidden | 1 = fetch the target page and include its hidden inputs |
autosubmit | omit or 1 = auto-submit via JS; 0 = visible form |
Any other parameter is echoed into the form as a field. GET renders text inputs; POST renders hidden inputs and always auto-submits.