[racket] difference between serve/servlet and serve/dispatch?

I'm puzzled by this function:

(serve/dispatch dispatch) → void
  dispatch : (request? . -> . response/c)

Calls serve/servlet with appropriate arguments so that every request is handled by dispatch.

Specifically, it appears that serve/dispatch has the same contract (minus all the optional args) that serve/servlet has. How is calling 

(serve/dispatch blog-dispatch)

different from calling 

(serve/servlet blog-dispatch)

?


John

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