Double compression?

[jknopp]

Although Webmaster Tools isn't complaining about the sitemap, when I download my gzip'd sitemap and extract, the resulting sitemap.xml file is actually a compressed file again. If I rename it to .gz and extract again, the new result works correctly. Not experiencing the same issue with any other gz files I download. Same behaviour if grabbing the file with Chrome or Firefox.

[XML-Sitemaps Support]

Hello,

what is your sitemap URL?

[jknopp]

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[XML-Sitemaps Support]

Hello,

possibly your server adds another compression "layer" on the fly. Please try to disable compression setting.

[jknopp]

Turned out sitemap.xml.gz wasn't actually compressed at all, but an uncompressed XML file pointing to the sub-parts. Google is smart enough to process it correctly anyway but clearly my machine got confused.

Seems to me there is a logic error that happens when you have compression selected in config and the sitemap gets broken into more than one part.