I have no idea if this is a potentially exploitable security issue or just a nit pick. In this comment:

yep! ;-) btw that's A._B._and_C. If you just past the link without the brackets, the SE url parser (for lack of a better name) thinks you made a mistake and truncates the link before the final period: https://en.wikipedia.org/wiki/A._B._and_C.

I point out that a bare url (from Wikipedia) that ends in a period is truncated, and sends you to the url without the period.

This automatic behavior produces a bad link when a good (but bare) link is pasted.

Is there any way to avoid this? I don't think it rises to the level of a bug, but is the auto-dropping of the trailing period in the url done ?


To answer the question in the title: yes. When URLs are auto-linked trailing periods, commas, question marks, etc. are discarded. This is for obvious reasons (i.e. ending of sentences often contain an URL) as explained by balpha in Why isn't the period rendered after a question link?.

The way to avoid it is to use the Markdown formatting for URLs as explained in How do I make this URL ending in a period work in the comments?. That is, use [https://en.wikipedia.org/wiki/A._B._and_C.](https://en.wikipedia.org/wiki/A._B._and_C.) or [<short-description>](https://en.wikipedia.org/wiki/A._B._and_C.).

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