Hi Elise Acheson,
This way I am able to get the CRS. But Lets say if i have to add multiple MPKs in my Project, then the response of ArcGISRuntime server is not good. so tp overcome this problem. I am thinking to create a single gpk service and this same service will be used for getting the CRS of any mpk, the only thing is, you have to give the path of that mpk.
if i remove following code from python:
mpk = arcpy.mapping.MapDocument("c:\myMpks\world.mpk")
dataFrames = arcpy.mapping.ListDataFrames(mpk)
myCRS = frame.spatialReference.name
then the gpk service works perfect (It doesnot get crashed.)