text: // META: global=window,worker
  // META: title=Request Headers
  
  var validRequestHeaders = [
    ["Content-Type", "OK"],
    ["Potato", "OK"],
    ["proxy", "OK"],
    ["proxya", "OK"],
    ["sec", "OK"],
    ["secb", "OK"],
  ];
  var invalidRequestHeaders = [
    ["Accept-Charset", "KO"],
    ["accept-charset", "KO"],
    ["ACCEPT-ENCODING", "KO"],
    ["Accept-Encoding", "KO"],
    ["Access-Control-Request-Headers", "KO"],
    ["Access-Control-Request-Method", "KO"],
    ["Connection", "KO"],
    ["Content-Length", "KO"],
    ["Cookie", "KO"],
    ["Cookie2", "KO"],
    ["Date", "KO"],
    ["DNT", "KO"],
    ["Expect", "KO"],
    ["Host", "KO"],
    ["Keep-Alive", "KO"],
    ["Origin", "KO"],
    ["Referer", "KO"],
    ["TE", "KO"],
    ["Trailer", "KO"],
    ["Transfer-Encoding", "KO"],
    ["Upgrade", "KO"],
    ["Via", "KO"],
    ["Proxy-", "KO"],
    ["proxy-a", "KO"],
    ["Sec-", "KO"],
    ["sec-b", "KO"],
  ];
  
  var validRequestNoCorsHeaders = [
    ["Accept", "OK"],
    ["Accept-Language", "OK"],
    ["content-language", "OK"],
    ["content-type", "application/x-www-form-urlencoded"],
    ["content-type", "application/x-www-form-urlencoded;charset=UTF-8"],
    ["content-type", "multipart/form-data"],
    ["content-type", "multipart/form-data;charset=UTF-8"],
    ["content-TYPE", "text/plain"],
    ["CONTENT-type", "text/plain;charset=UTF-8"],
  ];
  var invalidRequestNoCorsHeaders = [
    ["Content-Type", "KO"],
    ["Potato", "KO"],
    ["proxy", "KO"],
    ["proxya", "KO"],
    ["sec", "KO"],
    ["secb", "KO"],
  ];
  
  validRequestHeaders.forEach(function(header) {
    test(function() {
      var request = new Request("");
      request.headers.set(header[0], header[1]);
      assert_equals(request.headers.get(header[0]), header[1]);
    }, "Adding valid request header \"" + header[0] + ": " + header[1] + "\"");
  });
  invalidRequestHeaders.forEach(function(header) {
    test(function() {
      var request = new Request("");
      request.headers.set(header[0], header[1]);
      assert_equals(request.headers.get(header[0]), null);
    }, "Adding invalid request header \"" + header[0] + ": " + header[1] + "\"");
  });
  
  validRequestNoCorsHeaders.forEach(function(header) {
    test(function() {
      var requestNoCors = new Request("", {"mode": "no-cors"});
      requestNoCors.headers.set(header[0], header[1]);
      assert_equals(requestNoCors.headers.get(header[0]), header[1]);
    }, "Adding valid no-cors request header \"" + header[0] + ": " + header[1] + "\"");
  });
  invalidRequestNoCorsHeaders.forEach(function(header) {
    test(function() {
      var requestNoCors = new Request("", {"mode": "no-cors"});
      requestNoCors.headers.set(header[0], header[1]);
      assert_equals(requestNoCors.headers.get(header[0]), null);
    }, "Adding invalid no-cors request header \"" + header[0] + ": " + header[1] + "\"");
  });
  
  test(function() {
    var headers = new Headers([["Cookie2", "potato"]]);
    var request = new Request("", {"headers": headers});
    assert_equals(request.headers.get("Cookie2"), null);
  }, "Check that request constructor is filtering headers provided as init parameter");
  
  test(function() {
    var headers = new Headers([["Content-Type", "potato"]]);
    var request = new Request("", {"headers": headers, "mode": "no-cors"});
    assert_equals(request.headers.get("Content-Type"), null);
  }, "Check that no-cors request constructor is filtering headers provided as init parameter");
  
  test(function() {
    var headers = new Headers([["Content-Type", "potato"]]);
    var initialRequest = new Request("", {"headers": headers});
    var request = new Request(initialRequest, {"mode": "no-cors"});
    assert_equals(request.headers.get("Content-Type"), null);
  }, "Check that no-cors request constructor is filtering headers provided as part of request parameter");
  
  test(function() {
    var initialHeaders = new Headers([["Content-Type", "potato"]]);
    var initialRequest = new Request("", {"headers" : initialHeaders});
    var request = new Request(initialRequest);
    assert_equals(request.headers.get("Content-Type"), "potato");
  }, "Request should get its content-type from the init request");
  
  test(function() {
    var initialHeaders = new Headers([["Content-Type", "potato"]]);
    var initialRequest = new Request("", {"headers" : initialHeaders});
    var headers = new Headers([]);
    var request = new Request(initialRequest, {"headers" : headers});
    assert_false(request.headers.has("Content-Type"));
  }, "Request should not get its content-type from the init request if init headers are provided");
  
  test(function() {
    var initialHeaders = new Headers([["Content-Type-Extra", "potato"]]);
    var initialRequest = new Request("", {"headers" : initialHeaders, "body" : "this is my plate", "method" : "POST"});
    var request = new Request(initialRequest);
    assert_equals(request.headers.get("Content-Type"), "text/plain;charset=UTF-8");
  }, "Request should get its content-type from the body if none is provided");
  
  test(function() {
    var initialHeaders = new Headers([["Content-Type", "potato"]]);
    var initialRequest = new Request("", {"headers" : initialHeaders, "body" : "this is my plate", "method" : "POST"});
    var request = new Request(initialRequest);
    assert_equals(request.headers.get("Content-Type"), "potato");
  }, "Request should get its content-type from init headers if one is provided");
  
  test(function() {
    var array = [["hello", "worldAHH"]];
    var object = {"hello": 'worldOOH'};
    var headers = new Headers(array);
  
    assert_equals(headers.get("hello"), "worldAHH");
  
    var request1 = new Request("", {"headers": headers});
    var request2 = new Request("", {"headers": array});
    var request3 = new Request("", {"headers": object});
  
    assert_equals(request1.headers.get("hello"), "worldAHH");
    assert_equals(request2.headers.get("hello"), "worldAHH");
    assert_equals(request3.headers.get("hello"), "worldOOH");
  }, "Testing request header creations with various objects");
  
  promise_test(function(test) {
    var request = new Request("", {"headers" : [["Content-Type", ""]], "body" : "this is my plate", "method" : "POST"});
    return request.blob().then(function(blob) {
      assert_equals(blob.type, "", "Blob type should be the empty string");
    });
  }, "Testing empty Request Content-Type header");
  
  test(function() {
    const request1 = new Request("");
    assert_equals(request1.headers, request1.headers);
  
    const request2 = new Request("", {"headers": {"X-Foo": "bar"}});
    assert_equals(request2.headers, request2.headers);
    const headers = request2.headers;
    request2.headers.set("X-Foo", "quux");
    assert_equals(headers, request2.headers);
    headers.set("X-Other-Header", "baz");
    assert_equals(headers, request2.headers);
  }, "Test that Request.headers has the [SameObject] extended attribute");
  