I need to do bulk inserts and learned that there is the $batch operation in the REST API. https://msdn.microsoft.com/en-us/library/office/dn903506.aspx
I read through this and following and explored his GitHub http://www.andrewconnell.com/blog/part-1-sharepoint-rest-api-batching-understanding-batching-requests https://github.com/andrewconnell/sp-o365-rest/blob/master/SpRestBatchSample/Scripts/App.js
I ended up creating a POST against my server that looks like this
POST http://portalstst.m.DUMMY.com/sites/DUMMY_digital/_api/web/lists/getbytitle('Logging_DB')/Items HTTP/1.1
Host: portalstst.m.DUMMY.com
Connection: keep-alive
Content-Length: 680
Origin: http://portalstst.m.DUMMY.com
User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.1
contentType: application/json;odata=verbose
Content-Type: multipart/mixed; boundary="batch_6495a5b4-f360-44d4-9a61-5a9d515456de"
Accept: application/json;odata=verbose
DataServiceVersion: 1.0
X-RequestDigest: 0x428391B9D35610B96821EEF1C768534C38C8CEB9A275EC8A661C3D3DE08A7DB4A342899235931BA589AA153430D484C0D413976B028C77292E2F8A77F27C5039,19 Aug 2016 14:17:46 -0000
DNT: 1
Referer: http://portalstst.m.DUMMY.com/sites/DUMMY_digital/App/index.html
Accept-Encoding: gzip, deflate
Accept-Language: de,en-US;q=0.8,en;q=0.6
--batch_6495a5b4-f360-44d4-9a61-5a9d515456de
Content-Type: multipart/mixed; boundary="changeset_9473c1bb-265d-45df-9ad1-9a0487d043ee"
Content-Length: 436
Content-Transfer-Encoding: binary
--changeset_9473c1bb-265d-45df-9ad1-9a0487d043ee
Content-Type: application/http
Content-Transfer-Encoding: binary
POST http://portalstst.m.DUMMY.com/sites/DUMMY_digital/_api/web/lists/getbytitle('Logging_DB')/Items HTTP/1.1
Content-Type: application/json;odata=verbose
{"__metadata":{"type":"SP.Data.Logging_x005f_DBListItem"},"FromPage":"transformation","ToPage":"capability"}
--changeset_9473c1bb-265d-45df-9ad1-9a0487d043ee--
--batch_6495a5b4-f360-44d4-9a61-5a9d515456de--
The result in short: HTTP/1.1 415 Unsupported Media Type, The HTTP header Content-Type is missing or its value is invalid.
HTTP/1.1 415 Unsupported Media Type
Cache-Control: private, max-age=0
Content-Type: application/json;odata=verbose;charset=utf-8
Expires: Thu, 04 Aug 2016 14:17:53 GMT
Last-Modified: Fri, 19 Aug 2016 14:17:53 GMT
Server: Microsoft-IIS/8.5
X-SharePointHealthScore: 0
SPClientServiceRequestDuration: 140
X-AspNet-Version: 4.0.30319
SPRequestGuid: 72559b9d-7727-4083-b167-b7fd1dca3fb6
request-id: 72559b9d-7727-4083-b167-b7fd1dca3fb6
X-RequestDigest: 0xB102AC2A481F112F017D042DC858F3429233A97163971A795C93E38BDC57FD7B04967CABD190D539844F91C21252BD64BD6589C5D90E114550C1D6FB119C96F1,19 Aug 2016 14:17:53 -0000
X-FRAME-OPTIONS: SAMEORIGIN
X-Powered-By: ASP.NET
MicrosoftSharePointTeamServices: 15.0.0.4763
X-Content-Type-Options: nosniff
X-MS-InvokeApp: 1; RequireReadOnly
Date: Fri, 19 Aug 2016 14:17:52 GMT
Content-Length: 177
{"error":{"code":"-1, Microsoft.SharePoint.Client.ClientServiceException","message":{"lang":"en-US","value":"The HTTP header Content-Type is missing or its value is invalid."}}}
I compared my request to the example at https://gist.github.com/andrewconnell/ad502b73b2cc9504229d and don't see any mistake.
Now I wonder whether this is supported on premise at all? Or what I'm doing wrong?