diff --git a/ext/fetch/23_request.js b/ext/fetch/23_request.js
index cfdce01d3ea6bb..5232cc13c96c97 100644
--- a/ext/fetch/23_request.js
+++ b/ext/fetch/23_request.js
@@ -202,31 +202,29 @@ function cloneInnerRequest(request, skipBody = false) {
   };
 }
 
-/**
- * @param {string} m
- * @returns {boolean}
- */
-function isKnownMethod(m) {
-  return (
-    m === "DELETE" ||
-    m === "GET" ||
-    m === "HEAD" ||
-    m === "OPTIONS" ||
-    m === "POST" ||
-    m === "PUT"
-  );
-}
+// method => normalized method
+const KNOWN_METHODS = {
+  "DELETE": "DELETE",
+  "delete": "DELETE",
+  "GET": "GET",
+  "get": "GET",
+  "HEAD": "HEAD",
+  "head": "HEAD",
+  "OPTIONS": "OPTIONS",
+  "options": "OPTIONS",
+  "PATCH": "PATCH",
+  "patch": "PATCH",
+  "POST": "POST",
+  "post": "POST",
+  "PUT": "PUT",
+  "put": "PUT",
+};
+
 /**
  * @param {string} m
  * @returns {string}
  */
 function validateAndNormalizeMethod(m) {
-  // Fast path for well-known methods
-  if (isKnownMethod(m)) {
-    return m;
-  }
-
-  // Regular path
   if (RegExpPrototypeExec(HTTP_TOKEN_CODE_POINT_RE, m) === null) {
     throw new TypeError("Method is not valid.");
   }
@@ -325,9 +323,10 @@ class Request {
 
     // 25.
     if (init.method !== undefined) {
-      let method = init.method;
-      method = validateAndNormalizeMethod(method);
-      request.method = method;
+      const method = init.method;
+      // fast path: check for known methods
+      request.method = KNOWN_METHODS[method] ??
+        validateAndNormalizeMethod(method);
     }
 
     // 26.