Mimetype for attachments having newline characters

[Nijas Rawther]

Saw a strange behavior while fetching issue details using REST API in Jira SM. 

For an image attachment, the mimeType field returned is 

"mimeType": "image/png;\r\n\tname=\"image001.png\""

Why is this field corrupted ?
We are not able to use the value of this field in contentType header since newline characters in headers are not accepted.