url: use same credentials on redirect

Previously it could lose the username and only use the password.

Added test 998 and 999 to verify.

Reported-by: Tobias Bora
Fixes

url: use same credentials on redirect

Previously it could lose the username and only use the password.

Added test 998 and 999 to verify.

Reported-by: Tobias Bora
Fixes #15262
Closes #15282

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