Describe the bug
We encountered a bug in DDN Infinia where list requests were failing. We tracked it down to an unusual URI in the format of http://server/bucket?&list-type=2&prefix=foo/. Starting a query string with an ampersand (before list-type) is unusual and broke our URI parser.

To Reproduce
Run a list objects request with the AWS plugin and trace the URI generated.

Expected behavior
The URI should not start a query string with an ampersand. The above URI should be:
http://server/bucket?list-type=2&prefix=foo/

Additional context
We have fixed our parser to handle this corner case, but have customers we cannot upgrade right now so we would like to fix it in the crate.

I have a PR I will submit shortly.