While joining the paths together opts.BasePath and opts.Path, path.Join drops the trailing slash.

So, a /example/ui/ becomes /example/ui, and I get the error
"/example/ui" not found if I try to access /example/ui/

This is a problem because other languages use the trailing / as a pattern (for example python as here http://thomaxxl.pythonanywhere.com/api/ ), and we have webserver that use swagger in different languages.

There are 2 solutions, in my opinion:

1. [Preferred/Easiest] compare apples to apples and submit r.URL.Path to path.Join as well here:
   

   runtime/middleware/swaggerui.go

   Line 76 in 6a17228

   if r.URL.Path == pth {

   
   if path.Join(r.URL.Path) == pth {
2. do not use path.Join to join the opts.BasePath and opts.Path, just concatenate them

I can submit a PR for option 1 if you agree.

PS. It seems go is planning to have it's own JoinPath() inside net/url, and that could fix the problem in the future:
golang/go#47005
golang/go#52074