Download a file on a worker thread, and get called back when the response is readable. The callback is made after the response headers are ready. Reading the response body may still block. OkHttp doesn't currently offer asynchronous APIs to receive a response body in parts.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient()

      fun run() {

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1F54B..1F54F  ; valid                  ;      ; NV8    # 8.0  KAABA..BOWL OF HYGIEIA
1F550..1F567  ; valid                  ;      ; NV8    # 6.0  CLOCK FACE ONE OCLOCK..CLOCK FACE TWELVE-THIRTY
1F568..1F579  ; valid                  ;      ; NV8    # 7.0  RIGHT SPEAKER..JOYSTICK
1F57A         ; valid                  ;      ; NV8    # 9.0  MAN DANCING

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