fix(node-fetch): redirects from http to https

Author: ardatan

.changeset/cyan-cougars-confess.md

@@ -0,0 +1,5 @@
+---
+'@whatwg-node/node-fetch': patch
+---
+
+Fix redirects from http to https

packages/node-fetch/src/Request.ts

@@ -97,7 +97,15 @@ export class PonyfillRequest<TJSON = any> extends PonyfillBody<TJSON> implements
       }
     }
 
-    this._agent = requestInit?.agent;
+    if (requestInit?.agent != null) {
+      if (requestInit.agent === false) {
+        this._agent = false;
+      } else if (this.url.startsWith('http:/') && requestInit.agent instanceof HTTPAgent) {
+        this._agent = requestInit?.agent;
+      } else if (this.url.startsWith('https:/') && requestInit.agent instanceof HTTPSAgent) {
+        this._agent = requestInit?.agent;
+      }
+    }
   }
 
   headersSerializer?: HeadersSerializer;

packages/node-fetch/src/fetchCurl.ts

@@ -138,7 +138,8 @@ export function fetchCurl<TResponseJSON = any, TRequestJSON = any>(
         const ponyfillResponse = new PonyfillResponse(outputStream, {
           status,
           headers: headersInit,
-          url: fetchRequest.url,
+          url: curlHandle.getInfo(Curl.info.REDIRECT_URL)?.toString() || fetchRequest.url,
+          redirected: Number(curlHandle.getInfo(Curl.info.REDIRECT_COUNT)) > 0,
         });
         resolve(ponyfillResponse);
         streamResolved = outputStream;

packages/node-fetch/tests/fetch.spec.ts

@@ -225,6 +225,12 @@ describe('Node Fetch Ponyfill', () => {
         const resJson = await response.json();
         expect(resJson.test).toBe('test');
       });
+      it('handles redirect from http to https', async () => {
+        const response = await fetchPonyfill('http://github.com');
+        await response.text();
+        expect(response.status).toBe(200);
+        expect(response.url === 'https://github.com' || response.redirected).toBeTruthy();
+      });
     },
     { noNativeFetch: true },
   );