JPEG2000 - getJP2Header endpoint

This endpoint returns the XML header embedded in a JPEG2000 image.

The input parameters would be a dictionary.
 
**Endpoint**: https://api.helioviewer.org/v2/getJP2Header/
**Response**: XML header

**Example**: https://api.helioviewer.org/v2/getJP2Header/?id=7654321
