GitHub Pages not generating /index.html files

[SeanKilleen]

Cross-posted to StackOverflow: http://stackoverflow.com/questions/37078893/jekyll-github-pages-index-html-not-being-written

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Digging into an issue with GitHub pages that appears like it might be recent.

I noticed an up-tick in 404s via Google Analytics. It appears that posts with trailing slashes were becoming 404'd, but appeared just fine without the slash.

My local Jekyll instance generates the following structure for how-to-leave-a-company-well.md from Feb 2015:

/2015
   /02
    /how-to-leave-a-company-well.html
    /how-to-leave-a-company-well
      /index.html

So, the following URLs work just fine locally:

• http://localhost:4000/2015/02/how-to-leave-a-company-well
• http://localhost:4000/2015/02/how-to-leave-a-company-well.html
• http://localhost:4000/2015/02/how-to-leave-a-company-well/index.html
• http://localhost:4000/2015/02/how-to-leave-a-company-well/

Those last two URLs that I've bolded do not seem to exist on my published site after GitHub Pages generates the documents.

I cannot reach http://seankilleen.com/2015/02/how-to-leave-a-company-well/ or http://seankilleen.com/2015/02/how-to-leave-a-company-well/index.html

This seems to indicate to me that GitHub Pages is doing something differently than my Jekyll installation. Given that the 404 spike is recent, I'm wondering if there might have been a change related to this.