net: Don't ignore the referer header in net.request (#23386)

lib/browser/api/net.ts

@@ -386,6 +386,7 @@ class ClientRequest extends Writable implements Electron.ClientRequest {
       }
       return ret;
     };
+    this._urlLoaderOptions.referrer = this._urlLoaderOptions.extraHeaders.referer || '';
     const opts = { ...this._urlLoaderOptions, extraHeaders: stringifyValues(this._urlLoaderOptions.extraHeaders) };
     this._urlLoader = createURLLoader(opts);
     this._urlLoader.on('response-started', (event, finalUrl, responseHead) => {

shell/browser/api/electron_api_url_loader.cc

@@ -352,6 +352,7 @@ gin::Handle<SimpleURLLoaderWrapper> SimpleURLLoaderWrapper::Create(
   request->force_ignore_site_for_cookies = true;
   opts.Get("method", &request->method);
   opts.Get("url", &request->url);
+  opts.Get("referrer", &request->referrer);
   std::map<std::string, std::string> extra_headers;
   if (opts.Get("extraHeaders", &extra_headers)) {
     for (const auto& it : extra_headers) {

spec-main/api-net-spec.ts

@@ -1253,6 +1253,38 @@ describe('net module', () => {
         setTimeout(resolve, 50);
       });
     });
+
+    it('should remove the referer header when no referrer url specified', async () => {
+      const serverUrl = await respondOnce.toSingleURL((request, response) => {
+        expect(request.headers.referer).to.equal(undefined);
+        response.statusCode = 200;
+        response.statusMessage = 'OK';
+        response.end();
+      });
+      const urlRequest = net.request(serverUrl);
+      urlRequest.end();
+
+      const response = await getResponse(urlRequest);
+      expect(response.statusCode).to.equal(200);
+      await collectStreamBody(response);
+    });
+
+    it('should set the referer header when a referrer url specified', async () => {
+      const referrerURL = 'https://www.electronjs.org/';
+      const serverUrl = await respondOnce.toSingleURL((request, response) => {
+        expect(request.headers.referer).to.equal(referrerURL);
+        response.statusCode = 200;
+        response.statusMessage = 'OK';
+        response.end();
+      });
+      const urlRequest = net.request(serverUrl);
+      urlRequest.setHeader('referer', referrerURL);
+      urlRequest.end();
+
+      const response = await getResponse(urlRequest);
+      expect(response.statusCode).to.equal(200);
+      await collectStreamBody(response);
+    });
   });
 
   describe('IncomingMessage API', () => {

typings/internal-ambient.d.ts

@@ -58,6 +58,7 @@ declare namespace NodeJS {
     body: Uint8Array | BodyFunc;
     session?: Electron.Session;
     partition?: string;
+    referrer?: string;
   }
   type ResponseHead = {
     statusCode: number;