  "FormData request keeps setRequestHeader() Content-Type and charset"
      )
      request(
        function _URLSearchParams() { return new URLSearchParams("q=testQ&topic=testTopic") },
        {"Content-Type": ""},
        "",
        'URLSearchParams respects setRequestHeader("")'
      )
      request(
        function _URLSearchParams() { return new URLSearchParams("q=testQ&topic=testTopic") },
        {},
        "application/x-www-form-urlencoded;charset=UTF-8",
        'URLSearchParams request has