Before you start
obscura version or commit
6fa87e1
OS and architecture
Manjaro x86
How are you using obscura?
CLI (fetch / serve / scrape / mcp)
Affected area
CLI or MCP
Build variant
Render-enabled (official default archive or --features render)
Stealth mode
None
Reproduction
Minimal page served at http://127.0.0.1:8940/:
<!doctype html><meta charset="utf-8">
<form id="f" method="POST" action="/submitted">
<input name="q" id="q" value="">
<button type="submit" id="go">Envoyer</button>
</form>
The server logs every request it receives (method, path, body).
Path A — MCP (obscura --allow-private-network mcp, stdio)
browser_navigate {"url": "http://127.0.0.1:8940/"}
browser_fill {"selector": "#q", "value": "hello"}
browser_click {"selector": "#go"} -> "Clicked '#go'"
browser_evaluate {"expression": "location.href"}
-> "http://127.0.0.1:8940/submitted"
Requests seen by the server:
That is all. No request for /submitted.
Path B — CDP (obscura --allow-private-network serve, Puppeteer connectOverCDP)
await page.goto('http://127.0.0.1:8940/');
await page.type('#q', 'hello');
await page.click('#go');Requests seen by the server:
GET / body=''
POST /submitted body='q=hello'
Same binary, same page, same button. Only the driving layer differs.
Expected behavior
Clicking a submit button through the MCP tool browser_click reports success and updates
location.href to the form's action then a HTTP reques is sent.
Actual behavior
Clicking a submit button through the MCP tool browser_click reports success and updates
location.href to the form's action but no HTTP request is ever sent. The same click driven through CDP (Input.dispatchMouseEvent, e.g. Puppeteer's page.click()) correctly issues the POST.
The result is a silent false success: an agent sees Clicked '#go', reads back the expected URL, and concludes the form was submitted — while the server never received anything.
Rendering details
No response
Does headless Chrome behave the same?
No: headless Chrome renders or behaves correctly and obscura does not
Logs
INFO obscura_browser::page: script execution phase complete phase="script-execution-total" elapsed_ms=0 budget_ms=30000
Before you start
main.obscura version or commit
6fa87e1
OS and architecture
Manjaro x86
How are you using obscura?
CLI (fetch / serve / scrape / mcp)
Affected area
CLI or MCP
Build variant
Render-enabled (official default archive or --features render)
Stealth mode
None
Reproduction
Minimal page served at
http://127.0.0.1:8940/:The server logs every request it receives (method, path, body).
Path A — MCP (
obscura --allow-private-network mcp, stdio)Requests seen by the server:
That is all. No request for
/submitted.Path B — CDP (
obscura --allow-private-network serve, PuppeteerconnectOverCDP)Requests seen by the server:
Same binary, same page, same button. Only the driving layer differs.
Expected behavior
Clicking a submit button through the MCP tool
browser_clickreports success and updateslocation.hrefto the form'sactionthen a HTTP reques is sent.Actual behavior
Clicking a submit button through the MCP tool
browser_clickreports success and updateslocation.hrefto the form'sactionbut no HTTP request is ever sent. The same click driven through CDP (Input.dispatchMouseEvent, e.g. Puppeteer'spage.click()) correctly issues thePOST.The result is a silent false success: an agent sees
Clicked '#go', reads back the expected URL, and concludes the form was submitted — while the server never received anything.Rendering details
No response
Does headless Chrome behave the same?
No: headless Chrome renders or behaves correctly and obscura does not
Logs