Request to contentdirectory/events results into non XML result

[FelixPetriconi]

While finding a reason why it is not possible to get a valid connection to my Panasonic DP-UB820/824 Blu-Ray player, I investigated the communication on protocol level. Here I noticed that the request for contentdirectory/events does not return a valid XML object.
Here is a screenshot of the actual trace result:

As you can see that the result is actually a string of the type of the response but not the response. I am happy to do a fix if I would know more about C# and ASP.Net.
With some suggestions I would be happy to proceed here.

[FelixPetriconi]

I compared in the meantime the current result with the one that is returned by the original Emby implementation and there the response type is 'text/plain'. So my current assumption is that this return description is not correct. Probably the others non XML return functions too.

[FelixPetriconi]

A fix is in this PR