Website or domain

The domain is not accepted

Enter a full, stable URL, such as https://example.com. Do not use localhost, the dashboard URL, an internal proxy domain, or a URL containing spaces.

Check that the domain:

• opens over a regular mobile network without a VPN;
• has a valid HTTPS certificate;
• is already accessible through DNS;
• does not loop between HTTP, HTTPS, and www;
• does not block the check with bot protection.

After a change, wait a few seconds and refresh the preview.

The website does not open

Open the same path in mobile Safari or Chrome. If it does not work there either, fix the website, DNS, certificate, or CDN.

Symptom	Common cause
403	The website or CDN blocks the request
404	Incorrect domain or path
500	An error on the connected website
502 or 503	The website is temporarily unavailable
Redirect loop	Domain, HTTPS, language, or authentication conflict
Blank screen	A script, style, CDN resource, OAuth, or popup failed to load

If the error appears only after sign-in, test sign-out, signing in again, and session persistence on a real device. Do not add a user's session cookie to DEFAULT_COOKES.

If the website works directly but the error persists only in SiteCargo, send support the domain, affected path, HTTP status, app UID, and test time.