Outgoing Content Type Determination

In order to determine the value for the outgoing content type HTTP header, a certain priority exists:

1. Custom Content Type header from the transaction variable TV_FRIENDLYURL_ADDITIONAL_HEADERS.
2. File extension from the transaction variable TV_FRIENDLYURL_FILEEXTENSION.
3. Value of COOSYSTEM@1.1:content.COOSYSTEM@1.1:contencoding.
4. Value of COOSYSTEM@1.1:content.COOSYSTEM@1.1:contextension.
5. File extension from outgoing file.