feat: when get a chunked res, flush (by: yohox)

Author: JoaoOtavioS

lib/http-proxy/passes/web-outgoing.js

@@ -141,4 +141,20 @@ module.exports = {
       res.statusMessage = proxyRes.statusMessage;
     }
   },
+
+  /**
+   * If is a chunked response, flush headers.
+   *
+   * @param {ClientRequest} Req Request object
+   * @param {IncomingMessage} Res Response object
+   * @param {proxyResponse} Res Response object from the proxy request
+   *
+   * @api private
+   */
+  chunkedResponse: function chunkedResponse(req, res, proxyRes) {
+    const te = proxyRes.headers["transfer-encoding"];
+    if (te && te.toLowerCase() === "chunked") {
+      res.flushHeaders();
+    }
+  },
 };

test/lib-http-proxy-passes-web-outgoing-test.js

@@ -444,4 +444,22 @@ describe("lib/http-proxy/passes/web-outgoing.js", function () {
 
     expect(proxyRes.headers["transfer-encoding"]).to.eql(undefined);
   });
+
+  describe("#chunkedHeader", function () {
+    const proxyRes = {
+      headers: {
+        "transfer-encoding": "chunked",
+      },
+    };
+    let b = false;
+    const res = {
+      flushHeaders: () => {
+        b = true;
+      },
+    };
+
+    httpProxy.chunkedResponse({}, res, proxyRes);
+
+    expect(b).to.eql(true);
+  });
 });