fix(http): add zlib headers if missing (#5497)

lib/helpers/ZlibHeaderTransformStream.js

@@ -0,0 +1,28 @@
+"use strict";
+
+import stream from "stream";
+
+class ZlibHeaderTransformStream extends stream.Transform {
+  __transform(chunk, encoding, callback) {
+    this.push(chunk);
+    callback();
+  }
+
+  _transform(chunk, encoding, callback) {
+    if (chunk.length !== 0) {
+      this._transform = this.__transform;
+
+      // Add Default Compression headers if no zlib headers are present
+      if (chunk[0] !== 120) { // Hex: 78
+        const header = Buffer.alloc(2);
+        header[0] = 120; // Hex: 78
+        header[1] = 156; // Hex: 9C 
+        this.push(header, encoding);
+      }
+    }
+
+    this.__transform(chunk, encoding, callback);
+  }
+}
+
+export default ZlibHeaderTransformStream;