Resolve a critical issue by flushing after every byte is written out to the response. This ensures that node.js, orbitd, and other "reverse ajax" or "streaming-style" techniques work using the proxy.

Author: lightbody

src/main/java/org/browsermob/proxy/http/BrowserMobHttpClient.java

@@ -1005,6 +1005,7 @@ public static long copyWithStats(InputStream is, OutputStream os) throws IOExcep
                 if (length != -1) {
                     bytesCopied += length;
                     os.write(buffer, 0, length);
+                    os.flush();
                 }
             } while (length != -1);
         } finally {