2.9 Stateless Web Parameters

(require web-server/lang/web-param)

It is not easy to use parameterize in the Web Language. "lang/web-param.ss" provides (roughly) the same functionality in a way that is serializable. Like other serializable things in the Web Language, they are sensitive to source code modification.

(make-web-parameter default)

Expands to the definition of a web-parameter with default as the default value. A web-parameter is a procedure that, when called with zero arguments, returns default or the last value web-parameterized in the dynamic context of the call.

(web-parameter? v) → boolean?

v : any/c

Checks if v appears to be a web-parameter.

(web-parameterize ([web-parameter-expr value-expr] ...) expr ...)

Runs (begin expr ...) such that the web-parameters that the web-parameter-exprs evaluate to are bound to the value-exprs. From the perspective of the value-exprs, this is like let.