Seems like maybe something is broken on the nginx packages download.
For example, if I curl this endpoint I get a set of results from 31-Jul-2018
$ curl https://nginx.org/packages/rhel/7/x86_64/repodata/
<html>
<head><title>Index of /packages/rhel/7/x86_64/repodata/</title></head>
<body bgcolor="white">
<h1>Index of /packages/rhel/7/x86_64/repodata/</h1><hr><pre><a
href="../">../</a>
<a
href="431ec3b5d8c38dcb75ae6aad1e2044707c26b097cdd032e9230fe657799940c1-other.xml.gz">431ec3b5d8c38dcb75ae6aad1e2044707c26b097cdd032e..></a>
31-Jul-2018 12:16 8164
<a
href="4a825688a214584c3c5b655627ca3ef7340a67848b7ab8ed1bedd3fced3fc2f5-primary.sqlite.bz2">4a825688a214584c3c5b655627ca3ef7340a67848b7ab8e..></a>
31-Jul-2018 12:16 35734
<a
href="5dd555d317e17e2612f394576dc02326d7c06d18a15c102b24070efe69a09d06-filelists.sqlite.bz2">5dd555d317e17e2612f394576dc02326d7c06d18a15c102..></a>
31-Jul-2018 12:16 47533
<a
href="76f331ccb392cffc4fa30e0f60985c38fa69c8d953bca55b8a298162218056a9-primary.xml.gz">76f331ccb392cffc4fa30e0f60985c38fa69c8d953bca55..></a>
31-Jul-2018 12:16 12976
<a
href="8f5762215a64dd640a999e379e0fbffddf11c88e631c03b16b09864fc54c1a3c-other.sqlite.bz2">8f5762215a64dd640a999e379e0fbffddf11c88e631c03b..></a>
31-Jul-2018 12:16 19018
<a
href="c84d99af13732489a23f8b73fe9382b2a921e72644d66bd5c4709945d61352c7-filelists.xml.gz">c84d99af13732489a23f8b73fe9382b2a921e72644d66bd..></a>
31-Jul-2018 12:16 33396
<a href="repomd.xml">repomd.xml</a>
31-Jul-2018 12:16 2986
<a href="repomd.xml.asc">repomd.xml.asc</a>
31-Jul-2018 12:16 473
</pre><hr></body>
</html>
If I curl again I get a different set of results from 18-Sep-2018:
$ curl https://nginx.org/packages/rhel/7/x86_64/repodata/
<html>
<head><title>Index of /packages/rhel/7/x86_64/repodata/</title></head>
<body bgcolor="white">
<h1>Index of /packages/rhel/7/x86_64/repodata/</h1><hr><pre><a
href="../">../</a>
<a
href="0d104237ac1bdb053e7b601b4acb01cf249d0eb38842dd4e3c9e50ca6e1db292-filelists.xml.gz">0d104237ac1bdb053e7b601b4acb01cf249d0eb38842dd4..></a>
18-Sep-2018 16:27 34060
<a
href="20335881f90eb6dee86c4e5dde27efe4b280a5ce155f32d5982da721099a7590-primary.sqlite.bz2">20335881f90eb6dee86c4e5dde27efe4b280a5ce155f32d..></a>
18-Sep-2018 16:27 36166
<a
href="a698a3a644ea96503bace90f338282ae9ff4404820579a8a0b8f1b59f7f63fd3-primary.xml.gz">a698a3a644ea96503bace90f338282ae9ff4404820579a8..></a>
18-Sep-2018 16:27 13207
<a
href="ce1b99cc8d85853931a96a8b6c3f0270b4330f3034c22fed206e549d83ae534c-filelists.sqlite.bz2">ce1b99cc8d85853931a96a8b6c3f0270b4330f3034c22fe..></a>
18-Sep-2018 16:27 48828
<a
href="db9cdcedd470676185618a343302143eb4a7e5e9da3b996cb9d706171e3f9456-other.sqlite.bz2">db9cdcedd470676185618a343302143eb4a7e5e9da3b996..></a>
18-Sep-2018 16:27 19211
<a
href="fa18e6d14529bfa9446c346447ac7ae7135b175d93b5ab455aa71c4eed2c8ea6-other.xml.gz">fa18e6d14529bfa9446c346447ac7ae7135b175d93b5ab4..></a>
18-Sep-2018 16:27 8282
<a href="repomd.xml">repomd.xml</a>
18-Sep-2018 16:27 2986
<a href="repomd.xml.asc">repomd.xml.asc</a>
18-Sep-2018 16:27 473
</pre><hr></body>
</html>
The result is that you download the repomd.xml from whatever is returning
the first set of results, but then you try to download
5dd555d317e17e2612f394576dc02326d7c06d18a15c102b24070efe69a09d06-filelists.sqlite.bz2
but it gets handled by by whatever is returning the second set of results,
you get a 404.
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