The extra slash after S3's endpoint address may lead to a strange error

[gengliqi]

Please answer these questions before submitting your issue. Thanks!

1. What did you do?
   Add a slash after S3's endpoint address when using BR backup.
   E.g. http://xxxx:1234/

2. What did you expect to see?
   No error or the error should be "the URL cannot end with a slash"

3. What did you see instead?
   The error "msg:"Io(Custom { kind: Other, error: "failed to put object...)" appears.
   After I delete this slash, BR works fine.

4. What version of BR and TiDB/TiKV/PD are you using?
   v5.0.0-nightly

[kennytm]

In fact I'm not exactly sure this is a bug in minio or BR itself 😅. We can trim the final / but any chance some service requires that /?. Can we collect some behavior on non-minio services?

[kennytm]

as shown in #1162, also affects Hitachi Content Platform (HCP).