1. A computer-implemented method, comprising: receiving, at a computing system, source code that is to be served to a client computer responsive to a request from the client computer; selecting a first portion of the source code to exclude from an analysis that the computing system is programmed to perform on the source code, the selecting including: generating a set of tokens based on the source code, and determining that a first subset of the set of tokens that corresponds to the first portion of the source code matches a predefined set of tokens that correspond to source code that is designated as source code that does not require analysis; analyzing, by the computing system, a second portion of the source code other than the first portion of the source code to determine a manner in which to recode the source code so as to interfere with an ability of malware to exploit the source code when the source code is executed on the client computer, the first portion of the source code excluded from the analyzing as a result of the determining that the first subset of the set of tokens matches the predefined set of tokens; recoding the source code using a result of the analyzing; and providing the recoded source code to the client computer in response to the request.