[Mailer] Catch missing scheme in DSN #31993
Merged
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The
Symfony\Component\Mailer\Transport::createTransport()
method parses and validates a passed DSN. I noticed that we never check if the DSN contains a valid scheme, but we always assume that the scheme is present in then parse result. If someone passes a DSN without a scheme to that method, they would almost certainly run into a PHP notice.This PR makes sure that a scheme is present in the URL and throws a proper exception otherwise.