Couldn't connect to server: backblaze b2

我用backblaze b2作为储存后端,但是配置好重启后没法新建资料库了,我使用七牛云的时候是正常的,我就是把名字,endpoint, key, keyid之类的改了一下,就不行。是不是我的host 不对?
这个是配置 seafile_storage_classes.json :

{

"storage_id": "b2_storage",

"name": "b2 Storage",

"for_new_library": true,

"is_default": false,

"commits": {"backend": "s3", "bucket": "sea-commits", "key": "key***", "key_id": "id***", "host": "s3.us-west-002.backblazeb2.com", "path_style_request": "true"},

"fs": {"backend": "s3", "bucket": "sea-fs", "key": "key***", "key_id": "id***", "host": "s3.us-west-002.backblazeb2.com", "path_style_request": "true"},

"blocks": {"backend": "s3", "bucket": "sea-blocks", "key": "key***", "key_id": "id***", "path_style_request": "true"}

}

下面是log seafile.log :

[07/14/2020 03:32:01 PM] ../common/s3-client.c(704): [S3] libcurl failed to put sea-commits:77296716-de9e-4961-8463-f86bcb574134/d486d20a8ce4e2ec9d6db587b45eeb91050ca383: Couldn't connect to server.
[07/14/2020 03:32:01 PM] repo-mgr.c(6386): Failed to add commit.