Deleting Python packages with an exclamation mark (!)

Steps to reproduce

1. Create a local PyPI repo (eg. test-repo)
2. Upload a package with a ! in the version (eg. package-1!201804031351+ne9c86eb)
3. Try to delete it
   1. curl -XDELETE http://arti/artifactory/test-repo/package/1!201804031351%2Bne9c86eb/package-1!201804031351+ne9c86eb-py2.7.egg

That will result in a 404 HTTP status code response.

Conclusion

I've tried passing %21 instead of ! and even escaping it with \. Nothing worked. Not even downloading from that URL works. Notice that deleting packages without ! in their versions work fine.