Repository 'openSUSE-Tumbleweed-Oss' is invalid

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Retrieving repository 'openSUSE-Tumbleweed-Oss' metadata ...............................................................................................................................[error]
Repository 'openSUSE-Tumbleweed-Oss' is invalid.
[repo-oss|http://download.opensuse.org/tumbleweed/repo/oss/] Valid metadata not found at specified URL
History:
 - Download (curl) error for 'http://cdn.opensuse.org/tumbleweed/repo/oss/repodata/16bddda8cc151748848f358a5c140cc97c4f0663995e65b590243b72f1bebc2f-appdata.xml.gz':
   Error code: Curl error 52
   Error message: Empty reply from server
 - Can't provide ./repodata/16bddda8cc151748848f358a5c140cc97c4f0663995e65b590243b72f1bebc2f-appdata.xml.gz

Please check if the URIs defined for this repository are pointing to a valid repository.
Warning: Skipping repository 'openSUSE-Tumbleweed-Oss' because of the above error.
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Nothing to do.

The error “empty reply from server” indicates that a zero-length response was received . This means no HTTP headers or content, simply a closed TCP connection with no HTTP payload is transmitted. curl: (52) Empty reply from the server is a server related issue."
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Wait about 15 minutes and try again …