setProposedCredential
Set the #WebKitCredential of the proposed authentication challenge.
Set the #WebKitCredential of the proposed authentication challenge that was stored from a previous session. This should only be used by applications handling their own credential storage. (When using the default WebKit credential storage, webkit_authentication_request_get_proposed_credential() already contains previously-stored credentials.) Passing a null @credential will clear the proposed credential.
Since
2.30
Parameters
credential
a #WebKitCredential, or null