110 Citrix NetScaler Policy Configuration and Reference Guide
Expressions for HTTP Request and Response Dates
The following expression prefixes return the contents of the HTTP Date header as
text or as a date object.
These values can be evaluated as follows:
•As a number. The numeric value of an HTTP Date header is returned in the
form of the number of seconds since Jan 1 1970.
For example, the expression http.req.date.mod(86400) returns
the number of seconds since the beginning of the day. These values can be
evaluated using the same operations as other non-date-related numeric data.
For more information, see “Expression Prefixes for Numeric Data Other
Than Date and Time,” on page 111.
•As an HTTP header. Date headers can be evaluated using the same
operations as other HTTP headers.
For more information, see “Advanced Expressions: Parsing HTTP, TCP,
and UDP Data,” on page 113.
•As text. Date headers can be evaluated using the same operations as other
strings.
For more information, see “Advanced Expressions: Evaluating Text,” on
page 63.
Prefixes That Evaluate HTTP Date Headers
Prefix Description
HTTP.REQ.DATE Returns the contents of the HTTP Date header as
text or as a date object.The date formats
recognized are:
RFC822. Sun, 06 Jan 1980 08:49:37 GMT
RFC850. Sunday, 06-Jan-80 09:49:37 GMT
ASCTIME. Sun Jan 6 08:49:37 1980
HTTP.RES.DATE Returns the contents of the HTTP Date header as
text or as a date object.The date formats
recognized are:
RFC822. Sun, 06 Jan 1980 8:49:37 GMT
RFC850. Sunday, 06-Jan-80 9:49:37 GMT
ASCTIME. Sun Jan 6 08:49:37 1980