fix: should not throw when fetch a Request with post

.gitignore

@@ -16,3 +16,4 @@ test/fixtures/ts-cjs-es2021/*.js
 test/fixtures/ts-esm/*.js
 .eslintcache
 .tshy*
+.idea/

src/fetch.ts

@@ -218,7 +218,7 @@ export class FetchFactory {
     } as any as RawResponseWithMeta;
     try {
       await FetchFactory.#opaqueLocalStorage.run(internalOpaque, async () => {
-        res = await UndiciFetch(input, init);
+        res = await UndiciFetch(request);
       });
     } catch (e: any) {
       updateSocketInfo(socketInfo, internalOpaque, e);

test/fetch.test.ts

@@ -7,6 +7,7 @@ import {
   fetch, FetchDiagnosticsMessage, FetchFactory, FetchResponseDiagnosticsMessage,
 } from '../src/fetch.js';
 import { RequestDiagnosticsMessage, ResponseDiagnosticsMessage } from '../src/HttpClient.js';
+import { Request } from 'undici';
 
 describe('fetch.test.ts', () => {
   let close: any;
@@ -109,4 +110,14 @@ describe('fetch.test.ts', () => {
     assert(stats);
     assert(Object.keys(stats).length > 0);
   });
+
+  it('fetch request with post should work', async () => {
+    await assert.doesNotReject(async () => {
+      const request = new Request(_url, {
+        method: 'POST',
+        body: 'test-body',
+      });
+      await fetch(request);
+    }, /Cannot construct a Request with a Request object that has already been used/);
+  });
 });