0080-009F; [CONTROL CHARACTERS]
   06DD; ARABIC END OF AYAH
   070F; SYRIAC ABBREVIATION MARK
   180E; MONGOLIAN VOWEL SEPARATOR
   200C; ZERO WIDTH NON-JOINER
   200D; ZERO WIDTH JOINER
   2028; LINE SEPARATOR
   2029; PARAGRAPH SEPARATOR
   2060; WORD JOINER
   2061; FUNCTION APPLICATION
   2062; INVISIBLE TIMES
   2063; INVISIBLE SEPARATOR
   206A-206F; [CONTROL CHARACTERS]
   FEFF; ZERO WIDTH NO-BREAK SPACE

    assertForbiddenHeader("\u0000")
    assertForbiddenHeader("\r")
    assertForbiddenHeader("\n")
    assertForbiddenHeader("\u001f")
    assertForbiddenHeader("\u007f")
    assertForbiddenHeader("\u0080")
    assertForbiddenHeader("\ud83c\udf69")
  }

  private fun assertForbiddenHeader(s: String) {
    val builder = Request.Builder()
    assertFailsWith<IllegalArgumentException> {

E0000         ; disallowed                             # NA   <reserved-E0000>
E0001         ; disallowed                             # 3.1  LANGUAGE TAG
E0002..E001F  ; disallowed                             # NA   <reserved-E0002>..<reserved-E001F>
E0020..E007F  ; disallowed                             # 3.1  TAG SPACE..CANCEL TAG