The tutorials on installing and using FSSHTTPandWOPI Inspector for Fiddler are now available here.
The FSSHTTPandWOPI Inspector allows Fiddler users to view client requests and SharePoint server responses that use FSSHTTP or WOPI over HTTP protocol.
If client/SharePoint traffic is encrypted, you must configure Fiddler to decrypt HTTPS traffic. Otherwise, Fiddler is not able to display request and response data in the FSSHTTPandWOPI Inspector. You may also want to configure Fiddler to filter out traffic that is not client/SharePoint.
This tool is very helpful for troubleshooting and debugging FSSHTTP or WOPI traffic.