Update(Put) No Response Data

[#1]

I Created a Gateway Service for Read,Create and Update . In Read(Get),Create(Post) I'm getting Response Data But for

Update(Put) I'm not getting any Response data as shown below

Thanks ...

[kammaje_cis]

Sending error messages (with return code 204) for an Update operation in Response Header is a workaround and not really  OData compliant. You need to raise an exception if you need to get error messages as others suggested.