code: def _get_index_urls_locations(self, project_name):
          # type: (str) -> List[str]
          
  
          def mkurl_pypi_url(url):
              loc = posixpath.join(
                  url,
                  urllib_parse.quote(canonicalize_name(project_name)))
              # For maximum compatibility with easy_install, ensure the path
              # ends in a trailing slash.  Although this isn't in the spec
              # (and PyPI can handle it without the slash) some other index
              # implementations might break if they relied on easy_install's
              # behavior.
              if not loc.endswith('/'):
                  loc = loc + '/'
              return loc
  
          return [mkurl_pypi_url(url) for url in self.index_urls]
docs: Returns the locations found via self.index_urls
  
          Checks the url_name on the main (first in the list) index and
          use this url_name to produce all locations