(defn get-file-data [file]
  (java.nio.file.Files/readAllBytes
    (Paths/get
        (.toURI (-> (str "public/" file) java.io.File. .getAbsoluteFile)))))

(defn concat-byte-array [code request file file-extension]
  (byte-array
    (concat
      (.getBytes (add-header code request))    ; add-header makes a string of headers
      (get-file-data (get-file-name file) file-extension))))   ;get-file-data uses the above get-file-data method to create a byte array

(defn handle-valid-url [request]
  (clojure.java.io/copy (make-binary-response request 200 (get-file-name request) (get-file-extension request)) *out*)) ;make-binary-response just uses the above concat-byte-array to make a concatenated byte array of headers and the body