diff --git a/cli/tests/unit/fetch_test.ts b/cli/tests/unit/fetch_test.ts
index 45ab2d12cb..1b307b98d1 100644
--- a/cli/tests/unit/fetch_test.ts
+++ b/cli/tests/unit/fetch_test.ts
@@ -677,6 +677,7 @@ unitTest(
       "POST /blah HTTP/1.1\r\n",
       "hello: World\r\n",
       "foo: Bar\r\n",
+      "origin: http://js-unit-tests\r\n",
       "accept: */*\r\n",
       `user-agent: Deno/${Deno.version.deno}\r\n`,
       "accept-encoding: gzip, br\r\n",
@@ -712,6 +713,7 @@ unitTest(
       "hello: World\r\n",
       "foo: Bar\r\n",
       "content-type: text/plain;charset=UTF-8\r\n",
+      "origin: http://js-unit-tests\r\n",
       "accept: */*\r\n",
       `user-agent: Deno/${Deno.version.deno}\r\n`,
       "accept-encoding: gzip, br\r\n",
@@ -749,6 +751,7 @@ unitTest(
       "POST /blah HTTP/1.1\r\n",
       "hello: World\r\n",
       "foo: Bar\r\n",
+      "origin: http://js-unit-tests\r\n",
       "accept: */*\r\n",
       `user-agent: Deno/${Deno.version.deno}\r\n`,
       "accept-encoding: gzip, br\r\n",
@@ -1128,6 +1131,7 @@ unitTest(
       "POST /blah HTTP/1.1\r\n",
       "hello: World\r\n",
       "foo: Bar\r\n",
+      "origin: http://js-unit-tests\r\n",
       "accept: */*\r\n",
       `user-agent: Deno/${Deno.version.deno}\r\n`,
       "accept-encoding: gzip, br\r\n",
diff --git a/extensions/fetch/26_fetch.js b/extensions/fetch/26_fetch.js
index f7166001e4..f6cfced140 100644
--- a/extensions/fetch/26_fetch.js
+++ b/extensions/fetch/26_fetch.js
@@ -40,6 +40,8 @@
     TypeError,
     Uint8Array,
   } = window.__bootstrap.primordials;
+  const { getLocationHref } = window.__bootstrap.location;
+  const { URL } = window.__bootstrap.url;
 
   const REQUEST_BODY_HEADER_NAMES = [
     "content-encoding",
@@ -429,6 +431,17 @@
       }
       requestObject.signal[abortSignal.add](onabort);
 
+      const baseURL = getLocationHref();
+      if (
+        baseURL &&
+        (requestObject.method !== "GET" && requestObject.method !== "HEAD")
+      ) {
+        ArrayPrototypePush(request.headerList, [
+          "origin",
+          new URL(baseURL).origin,
+        ]);
+      }
+
       if (!requestObject.headers.has("accept")) {
         ArrayPrototypePush(request.headerList, ["accept", "*/*"]);
       }
diff --git a/tools/wpt/expectation.json b/tools/wpt/expectation.json
index dc33d70dea..b09cbf34c0 100644
--- a/tools/wpt/expectation.json
+++ b/tools/wpt/expectation.json
@@ -2646,26 +2646,7 @@
         "request-headers-nonascii.any.html": true,
         "request-headers.any.html": [
           "Fetch with PUT without body",
-          "Fetch with PUT with body",
-          "Fetch with POST without body",
-          "Fetch with POST with text body",
-          "Fetch with POST with FormData body",
-          "Fetch with POST with URLSearchParams body",
-          "Fetch with POST with Blob body",
-          "Fetch with POST with ArrayBuffer body",
-          "Fetch with POST with Uint8Array body",
-          "Fetch with POST with Int8Array body",
-          "Fetch with POST with Float32Array body",
-          "Fetch with POST with Float64Array body",
-          "Fetch with POST with DataView body",
-          "Fetch with POST with Blob body with mime type",
-          "Fetch with Chicken",
-          "Fetch with Chicken with body",
-          "Fetch with POST and mode \"same-origin\" needs an Origin header",
-          "Fetch with POST and mode \"no-cors\" needs an Origin header",
-          "Fetch with PUT and mode \"same-origin\" needs an Origin header",
-          "Fetch with TacO and mode \"same-origin\" needs an Origin header",
-          "Fetch with TacO and mode \"cors\" needs an Origin header"
+          "Fetch with POST without body"
         ],
         "text-utf8.any.html": true,
         "accept-header.any.html": [