Ignore trailing dot

[bradfitz]

I went to http://go/foo. and got a 404. But http://go/foo works.

On 404, try to trim the trailing dot and try that? For people copy/pasting links with a trailing period in a sentence.

/cc @willnorris

[willnorris]

Probably all punctuation characters. I can imagine ) and , being pretty common

[parkr]

It's probably handled by extracting the path only but header links like go/foo#my-heading-(parenthetical) would break if punctuation is removed from the full URL without first extracting the path.