Import //fetch from Web Platform Tests.

third_party/WebKit/LayoutTests/external/wpt/fetch/api/basic/request-headers.js

+if (this.document === undefined) {
+  importScripts("/resources/testharness.js");
+  importScripts("../resources/utils.js");
+}
+
+function checkContentType(contentType, body)
+{
+    if (self.FormData && body instanceof self.FormData) {
+        assert_true(contentType.startsWith("multipart/form-data; boundary="), "Request should have header content-type starting with multipart/form-data; boundary=, but got " + contentType);
+        return;
+    }
+
+    var expectedContentType = "text/plain;charset=UTF-8";
+    if(body === null || body instanceof ArrayBuffer || body.buffer instanceof ArrayBuffer)
+        expectedContentType = null;
+    else if (body instanceof Blob)
+        expectedContentType = body.type ? body.type : null;
+    else if (body instanceof URLSearchParams)
+        expectedContentType = "application/x-www-form-urlencoded;charset=UTF-8";
+
+    assert_equals(contentType , expectedContentType, "Request should have header content-type: " + expectedContentType);
+}
+
+function requestHeaders(desc, url, method, body, expectedOrigin, expectedContentLength) {
+  var urlParameters = "?headers=origin|user-agent|accept-charset|content-length|content-type";
+  var requestInit = {"method": method}
+  promise_test(function(test){
+    if (typeof body === "function")
+      body = body();
+    if (body)
+      requestInit["body"] = body;
+    return fetch(url + urlParameters, requestInit).then(function(resp) {
+      assert_equals(resp.status, 200, "HTTP status is 200");
+      assert_equals(resp.type , "basic", "Response's type is basic");
+      assert_true(resp.headers.has("x-request-user-agent"), "Request has header user-agent");
+      assert_false(resp.headers.has("accept-charset"), "Request has header accept-charset");
+      assert_equals(resp.headers.get("x-request-origin") , expectedOrigin, "Request should have header origin: " + expectedOrigin);
+      if (expectedContentLength !== undefined)
+        assert_equals(resp.headers.get("x-request-content-length") , expectedContentLength, "Request should have header content-length: " + expectedContentLength);
+      checkContentType(resp.headers.get("x-request-content-type"), body);
+    });
+  }, desc);
+}
+
+var url = RESOURCES_DIR + "inspect-headers.py"
+
+requestHeaders("Fetch with GET", url, "GET", null, null, null);
+requestHeaders("Fetch with HEAD", url, "HEAD", null, null, null);
+requestHeaders("Fetch with PUT without body", url, "POST", null, location.origin, "0");
+requestHeaders("Fetch with PUT with body", url, "PUT", "Request's body", location.origin, "14");
+requestHeaders("Fetch with POST without body", url, "POST", null, location.origin, "0");
+requestHeaders("Fetch with POST with text body", url, "POST", "Request's body", location.origin, "14");
+requestHeaders("Fetch with POST with FormData body", url, "POST", function() { return new FormData(); }, location.origin);
+requestHeaders("Fetch with POST with URLSearchParams body", url, "POST", function() { return new URLSearchParams("name=value"); }, location.origin, "10");
+requestHeaders("Fetch with POST with Blob body", url, "POST", new Blob(["Test"]), location.origin, "4");
+requestHeaders("Fetch with POST with ArrayBuffer body", url, "POST", new ArrayBuffer(4), location.origin, "4");
+requestHeaders("Fetch with POST with Uint8Array body", url, "POST", new Uint8Array(4), location.origin, "4");
+requestHeaders("Fetch with POST with Int8Array body", url, "POST", new Int8Array(4), location.origin, "4");
+requestHeaders("Fetch with POST with Float32Array body", url, "POST", new Float32Array(1), location.origin, "4");
+requestHeaders("Fetch with POST with Float64Array body", url, "POST", new Float64Array(1), location.origin, "8");
+requestHeaders("Fetch with POST with DataView body", url, "POST", new DataView(new ArrayBuffer(8), 0, 4), location.origin, "4");
+requestHeaders("Fetch with POST with Blob body with mime type", url, "POST", new Blob(["Test"], { type: "text/maybe" }), location.origin, "4");
+requestHeaders("Fetch with Chicken", url, "Chicken", null, location.origin, null);
+requestHeaders("Fetch with Chicken with body", url, "Chicken", "Request's body", location.origin, "14");
+
+function requestOriginHeader(method, mode, needsOrigin) {
+  promise_test(function(test){
+    return fetch(url + "?headers=origin", {method:method, mode:mode}).then(function(resp) {
+      assert_equals(resp.status, 200, "HTTP status is 200");
+      assert_equals(resp.type , "basic", "Response's type is basic");
+      if(needsOrigin)
+        assert_equals(resp.headers.get("x-request-origin") , location.origin, "Request should have an Origin header with origin: " + location.origin);
+      else
+        assert_equals(resp.headers.get("x-request-origin"), null, "Request should not have an Origin header")
+    });
+  }, "Fetch with " + method + " and mode \"" + mode + "\" " + (needsOrigin ? "needs" : "does not need") + " an Origin header");
+}
+
+requestOriginHeader("GET", "cors", false);
+requestOriginHeader("POST", "same-origin", true);
+requestOriginHeader("POST", "no-cors", true);
+requestOriginHeader("PUT", "same-origin", true);
+requestOriginHeader("TacO", "same-origin", true);
+requestOriginHeader("TacO", "cors", true);
+
+done();