The citation helper usually includes some link in the citation. Specifically, it includes a link to zbMATH. And a link to a paper - quite often as DOI.
However, the DOI-links are in the "old" format http://dx.doi.org/DOI rather than https://doi.org/DOI. For example, I have just tested this on MathOverflow, and I see that I got:
<cite authors="Cervone, Davide">_Cervone, Davide_,
[**MathJax: a platform for mathematics on the web**](http://dx.doi.org/10.1090/noti794),
Notices Am. Math. Soc. 59, No. 2, 312-316 (2012).
[ZBL1237.68242](https://zbmath.org/?q=an:1237.68242).</cite>
Cervone, Davide, MathJax: a platform for mathematics on the web, Notices Am. Math. Soc. 59, No. 2, 312-316 (2012). ZBL1237.68242.
Suggestion: When such links are inserted by the citation helper, use https://doi.org/ instead of http://dx.doi.org/.
I understand that this is a rather minor problem - still, if this is something which is easy to change, I would consider it an improvement. (I think that if https links are available, they should be preferred.)
I do not know whether sometimes the citation helper adds a link for the article in some other format (not using doi.org) and whether such links have a similar problem. But I guess people with access to the source code would be able to check that relatively easily.
Citation helper seems to be used most often on MO and Math.SE:
- Post with http: between
<cite>and</cite>: MathOverflow, Mathematics, Theoretical Computer Science. - Posts without http: between
<cite>and</cite>: MathOverflow, Mathematics, Theoretical Computer Science.
Of course, the entry included by the citation helper could have been further edited manually.
AFAICT there are only a few sites which use citation helper. (Originally MathOverflow, and there are Mathematics and Theoretical Computer Science, too. There are feature requests on Physics and Proof Assistants.)
Still, since it is more than one site, I thought that it might be suitable to post this on Meta Stack Exchange. (If that is a better option, I can post this on a per-site-meta instead.)
Added later: It seems that recently zbMATH change the format of their links from https://zbmath.org/?q=an:1237.68242 to https://zbmath.org/1237.68242. (The latter is the link you'll get from their website.) But since the old links still work, this isn't really an issue.
