br s3 endpoint can't end with '/' #30104
Description
Bug Report
Please answer these questions before submitting your issue. Thanks!
This bug is a little bit frustrating.
1. Minimal reproduce step (Required)
AWS_ACCESS_KEY_ID=xxxx AWS_SECRET_ACCESS_KEY=xxxxx tiup br backup full --s3.endpoint http://minio.pingcap.net:9000/ -s s3://tmp/sysbenc-empty-cy
2. What did you expect to see? (Required)
br backup successfully
3. What did you see instead (Required)
br backup failed
Error: error happen in store 1 at 127.0.0.1:20160: Io(Custom { kind: Other, error: "failed to put object Request ID: None Body: <?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Error><Code>BadRequest</Code><Message>An error occurred when parsing the HTTP request PUT at '/
/tmp/sysbenc-empty-cy/1_2_28_2550d727ffe3e408af41f541b134d5e064440c25988bbecfb665933d1195a45d_1637743793014_write.sst'</Message><Resource>//tmp/sysbenc-empty-cy/1_2_28_2550d727ffe3e408af41f541b134d5e064440c25988bbecfb665933d1195a45d_1637743793014_write.sst</Resource><
RequestId></RequestId><HostId>bf48f99f-3f89-4a20-bd11-95d1658fa9c8</HostId></Error>" }): [BR:KV:ErrKVStorage]tikv storage occur I/O error
Error: run `/root/.tiup/components/br/v5.3.0/br` (wd:/root/.tiup/data/Spfa3FJ) failed: exit status 1
4. What is your TiDB version? (Required)
5.3.0