SPDY may prevent incidents from getting captured by DLP using application such as Gmail.
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It has been observed that Gmail uses new protocol called SPDY to transfer its content. Till Firefox 12.0 support of SPDY was disabled by default, but from Firefox 13.0 SPDY is enabled by default because of that content fetched by Firefox hook is not recognized by HTTP parser and it does not get blocked.
Starting in version 14.0, DLP has added the feature to auto disable SPDY. This is covered in DOC8788
The SPDY protocol can be enabled and disabled using the
NetworkMonitor.DISABLE_SPDY_PROTOCOL.int setting on the Advanced
Agent Settings screen.
For DLP versions prior to 14.0, refer to TECH219417.