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Web proxy cache log values

Updated: February 1, 2011

Applies To: Forefront Threat Management Gateway (TMG)

The Web Proxy log can include a cache information field that specifies the cache status of the object, which indicates why the object was or was not cached. The following table lists the possible cache info values.

 

Value Description

0x00000001

Request should not be served from the cache.

0x00000002

Request includes the IF-MODIFIED-SINCE header.

0x00000004

Request includes one of these headers: CACHE-CONTROL: NO-CACHE or PRAGMA: NO-CACHE.

0x00000008

Request includes the AUTHORIZATION header.

0x00000010

Request includes the VIA header.

0x00000020

Request includes the IF-MATCH header.

0x00000040

Request includes the RANGE header.

0x00000080

Request includes the CACHE-CONTROL: NO-STORE header.

0x00000100

Request includes the CACHE-CONTROL: MAX-AGE, CACHE-CONTROL: MAX-STALE, or CACHE-CONTROL: MIN-FRESH header.

0x00000200

Cache could not be updated.

0x00000400

IF-MODIFIED-SINCE time specified in the request is newer than the cached LASTMODIFIED time.

0x00000800

Request includes the CACHE-CONTROL: ONLY-IF-CACHED header.

0x00001000

Request includes the IF-NONE-MATCH header.

0x00002000

Request includes the IF-UNMODIFIED-SINCE header.

0x00004000

Request includes the IF-RANGE header.

0x00008000

More than one VARY header.

0x00010000

Response includes the CACHE-CONTROL: PUBLIC header.

0x00020000

Response includes the CACHE-CONTROL: PRIVATE header.

0x00040000

Response includes the CACHE-CONTROL: NO-CACHE or PRAGMA: NO-CACHE header.

0x00080000

Response includes the CACHE-CONTROL: NO-STORE header.

0x00100000

Response includes either the CACHE-CONTROL: MUST-REVALIDATE or CACHE-CONTROL: PROXY-REVALIDATE header.

0x00200000

Response includes the CACHE-CONTROL: MAX-AGE or S-MAXAGE header.

0x00400000

Response includes the VARY header.

0x00800000

Response includes the LAST-MODIFIED header.

0x01000000

Response includes the EXPIRES header.

0x02000000

Response includes the SET-COOKIE header.

0x04000000

Response includes the WWW-AUTHENTICATE header.

0x08000000

Response includes the VIA header.

0x10000000

Response includes the AGE header.

0x20000000

Response includes the TRANSFER-ENCODING header.

0x40000000

Response should not be cached.

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