transfer: clear credentials when redirecting to absolute URL

Make sure the user and password for the second request is taken from the
redirected-to URL.

Add test case 899 to ver

transfer: clear credentials when redirecting to absolute URL

Make sure the user and password for the second request is taken from the
redirected-to URL.

Add test case 899 to verify.

Reported-by: James Lucas
Fixes #11410
Closes #11412

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