The net err_unknown_url_scheme error is often detected due to an incompatibility between the protocols involved in web browsers and programs. In most cases this error is appeared because the WebView canโt recognize the special URL Scheme. for example, the WebView will usually recognize http and https, anything other than these, for example โ intent://, market://, app://, mail:// , whatsapp:// etc will not be recognized by WebView unless we add a handler to handle these url schemes, or by disabling these schemes and only load http and https schemes.There's no application on your device which can handle that particular action. It is a Chromium bug . In Chrome version 40 and up, this bug has resurfaced, but only if you are manually entering the URL of the redirect page in the address bar.
This error has one temporary solution. When the error gets encountered you need to backward and click to open the page again. Might this solution can temporarily move you away from this recent err_unknown_url_scheme on chrome and android. You may get this error during mailto: or tel: links inside an iframe. To solve it, try to add target="_blank" in your URL Scheme/Code.
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