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Try this code:
(get "/hello/:who" (lambda (rc) (format #f "<p>hello ~a</p> " (params rc "who")))) (run #:port 8080)
Now you can try http://localhost:8080/hello/artanis in your browser.
There’re two differences:
And format is a Scheme lib function. It is similar to sprintf in C language, which outputs with a formatted pattern. The second argument #f (means FALSE) indicates that returning the result as string type rather than printing out.