I have searched regarding this content type,Content-Type: application/vnd.google.safebrowsing-update. though some articles are given on net regarding this type but i still don’t understand :S
HTTP/1.0 200 OK
Content-Type: application/vnd.google.safebrowsing-update
X-Content-Type-Options: nosniff
Date: Tue, 16 Dec 2011 05:57:44 GMT
Server: Chunked Update Server
Content-Length: 459
X-XSS-Protection: 1; mode=block
Connection: Keep-Alive
application/indicates that the content is intended to be opened by a specific application.vnd.indicates that the MIME-type is defined by a specific vendor. This is useful when creating your own file types for your programs and intend to distribute them online. You can register specific MIME types to open with your program without the possibility of interefering with other opreation.google.is the vendor in this case.safebrowsing-updateis the specific type of file from Google. The name is self-explanatory.