print_pdf.clj

(require
 '[clj-chrome-devtools.core          :as chrome]
 '[clj-chrome-devtools.commands.page :as page])

(defn b64-decode
  "https://stackoverflow.com/a/39188819/53790"
  [to-decode]
  (String. (.decode (Base64/getDecoder) to-decode)))

(def c (chrome/connect "localhost" 9222))
(page/navigate c {:url "https://github.com"})
(let [response (page/print-to-pdf c {:page-ranges "1-2"})
      pdf-data (b64-decode (:data response))]
  (spit "test.pdf" pdf-data))