Problem

I uploaded my sitemap.xml to Google Webmaster, but I received warnings: 404.html was in the sitemap, but the crawl was blocked by robots.txt.

Discussion

Obviously, I should find a way to exclude the 404 page from the sitemap. In the old days, one can add the path name of the page to be excluded.¹

However, the file plugins/sitemap_generator.rb has been deleted since commit 52f9119. How can the 404 page be excluded from the sitemap then?

Solution

Searching “octopress sitemap exclude url” won’t help. Actually, adding a line sitemap: false in source/404.md will do.