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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. |