Download a file, print its headers, and print its response body as a string.

The `string()` method on response body is convenient and efficient for small documents. But if the response body is large (greater than 1 MiB), avoid `string()` because it will load the entire document into memory. In that case, prefer to process the body as a stream.

=== ":material-language-kotlin: Kotlin"
    ```kotlin

    val actual = source!!.buffer().readUtf8()
    assertThat(actual).isEqualTo(expected)
  }

  /**
   * Returns true when all work currently in progress by the watchdog have completed. This method
   * creates more work for the watchdog and waits for that work to be executed. When it is, we know
   * work that preceded this call is complete.
   */
  private fun awaitWatchdogIdle() {
    val latch = CountDownLatch(1)

gov.ua gov.uk gov.vc gov.ve gov.vn gov.ws gov.ye gov.za gov.zm gov.zw government.aero govt.nz gp gq gr gr.com gr.eu.org gr.it gr.jp grainger grajewo.pl gran.no grandrapids.museum grane.no granvin.no graphics graphox.us gratangen.no gratis graz.museum greater.jp green greta.fr grimstad.no gripe griw.gov.pl grocery groks-the.info groks-this.info grondar.za grong.no grosseto.it groundhandling.aero group group.aero grozny.ru grozny.su grp.lk gru.br grue.no gs gs.aa.no gs.ah.no gs.bu.no gs.cn gs.fm.no gs.hl.no...

FE63          ; mapped                 ; 002D          # 1.1  SMALL HYPHEN-MINUS
FE64          ; disallowed_STD3_mapped ; 003C          # 1.1  SMALL LESS-THAN SIGN
FE65          ; disallowed_STD3_mapped ; 003E          # 1.1  SMALL GREATER-THAN SIGN
FE66          ; disallowed_STD3_mapped ; 003D          # 1.1  SMALL EQUALS SIGN
FE67          ; disallowed                             # NA   <reserved-FE67>

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