HTTP input variables are a key way to control the operation of a dynamic website. These are typically embedded in your input page with <input> tags. webMathematica provides a number of functions for working with and processing input. This needs to be done carefully to avoid any security problems.

MSPBlock — secure scoping construct for HTTP input

MSPToExpression — interpret input in a secure way

MSPValue — return the value of an HTTP input variable

MSPValueQ — test if an HTTP input variable as a value