Bug: DOI links are broken in HTML exports

[yarnton]

Hi,

I've found a small bug in org-html-export-to-html. Minimal document to reproduce:

---

Foo [fn:1]

* Footnotes

[fn:1] doi:10.1186/s12864-016-2377-z

---

When I export this document to HTML the DOI link gets converted into a broken hyperlink. It should be converted into https://doi.org/10.1186/s12864-016-2377-z as explained in https://www.doi.org/.

Following the link from the org file with C-c C-o works fine, though.

It'd be great if this could get fixed, as DOI links are incredibly helpful when dealing with bibliographic items.

Thanks