CSTCloud Data Capsule
CSTCloud Data Capsule offers 20 GB of free object storage with an S3-compatible API.
Get S3 credentials
- Sign in at data.cstcloud.cn.
- Create a data space (your S3 bucket).
- Open Client access for that space.
- Create an AccessKey and save the Access Key ID and Secret Access Key (the secret is shown only once).
Create the AccessKey
On the Client access page, choose S3Drive as the client application when you create the AccessKey.
Data Capsule binds the key to that application and rejects any other User-Agent with HTTP 401. ShrimpSend detects *.cstcloud.cn and sends S3Drive automatically. There is no client-application field in ShrimpSend settings.
If an existing key was bound to S3Browser, Rclone, or another app, create a new key and select S3Drive.
ShrimpSend settings
The console may show either address. Enter it exactly, including https://:
https://s3.cstcloud.cn(more common)https://s3.data.cstcloud.cn(if DNS does not resolve, use the address above)
| Field | Value |
|---|---|
| Endpoint | The Client access address, for example https://s3.cstcloud.cn |
| Region | us-east-1 |
| Bucket | Space name from Client access |
| Path-style access | On (required) |
| Access Key ID / Secret | From Client access |
Browse and upload from the app. Browsers do not allow a page to set User-Agent, so a direct Web upload to Data Capsule can still return 401.
Test connection
After saving, use Test connection. ShrimpSend runs a server-side HeadBucket probe and a client-side HEAD on a presigned URL.
If it fails, verify endpoint, path-style, region, bucket name, and that the AccessKey is bound to S3Drive. Check logs for serverProbe and S3 XML error codes.
WebDAV (remote storage)
Data Capsule also offers WebDAV at https://data.cstcloud.cn/dav. Create WebDAV credentials in the console, then add a connection under Settings → WebDAV in ShrimpSend.
WebDAV uses the same *.cstcloud.cn hosts and CFCA certificate chain as S3. Backend connection tests need the same supplemental trust; upgraded servers handle this automatically.
The console only supports Zotero (8+) for WebDAV credentials. ShrimpSend sends the matching Zotero User-Agent for browsing and downloads; use the WebDAV username and password from the console (not your login password).
Important: Data Capsule WebDAV does not support uploads in ShrimpSend — browse and download only. To upload files, configure Settings → S3 with a Data Capsule S3 AccessKey instead.
CORS (Web)
For browser uploads, configure bucket CORS to allow your ShrimpSend Web origin with at least GET, PUT, and HEAD.