Using html-proofer on collections of Jekyll posts

[RVledder]

Perhaps a bit off topic for just html-proofer, since it seems to be a combination with jekyll. But perhaps someone has experience with this combination.

We're running into a problem where normal pages are working fine, however collection pages are not found by html-proofer.

example error:

- ./_site/blog/choose-a-datasource.html
  *  internally linking to /blog/choose-a-datasource, which does not exist (line 82)
     <a href="/blog/choose-a-datasource" class="current">Choose a data source</a>

In the following Travis report the collection articles with 'blog' are not found:
https://travis-ci.org/semi-technologies/semi-website/builds/514826595#L1065

However, in the source folder the the page does exist:
https://github.com/semi-technologies/semi-website/tree/permalinks/_blog

And a jekyll build succesfully builds them into ./_site.

(As stated in the config this should indeed output /blog/choose-a-datasource.)

Perhaps this has something to do with the collection folder is in the root of the project, but it's prefixed with an underscore?

[RVledder]

Turned out the cause was trailing slashes behind URL's /.

[gjtorikian]

https://github.com/gjtorikian/html-proofer#using-with-jekyll may also have helped, unsure if you saw that.