It is not strictly related with the topic of this PR, but maybe we can also take the advantage of fixing also the following issue related with Accept.

In particular, I think that "*/*" shouldn't be used because we are not able to accept any type. I think that the value of Accept should be the same that is used as Content-Type. Maybe this is a subtle thing as CB will not actually use any potential response to notifyContextRequest or notifyContextResponse, but in order to be more "compliant with HTTP" it think we should do that :)

@kzangeli , @LeandroGuillen , what do you think?