Issue Summary

This is reproducible in Data Center: Yes

Steps to Reproduce

1. Create a space/site export from any confluence version, to import it to Confluence 8.4.1
2. Place the space export in <confluence-home>/shared/restore/space (or) site export in - <confluence-home>/shared/restore/site
3. Use cURL - 

   cURL -D- -u <user_name>:<password> -X POST -H "X-Atlassian-Token: nocheck" -F "file=@<file_name>.zip" http://<base_url>/rest/api/backup-restore/restore/space/upload

Ref : https://docs.atlassian.com/ConfluenceServer/rest/8.4.1/

Expected Results

• Site/Space should be imported into the destination Confluence 

Actual Results

{"statusCode":400,"data":{"authorized":false,"valid":true,"allowedInReadOnlyMode":true,"errors":[],"successful":false},"message":"The uploaded file should be a valid zip file.","reason":"Bad Request"}%                                              

 
From conf_access_*.log

[17/Aug/2023:07:07:34 +0530] admin http-nio-6841-exec-3 127.0.0.1 POST /c841/rest/api/backup-restore/restore/site/upload HTTP/1.1 400 143ms 211 - curl/8.1.2 

Workaround

Add ;type=application/zip after the filename:

curl -k -D- -u <user_name>:<password> -X POST -H "X-Atlassian-Token: nocheck" -F "file=@myfile.zip;type=application/zip" "http://<base_url>/rest/api/backup-restore/restore/space/upload"