Switch back to send_file and add a bit of gzip buffering

util/gzipwrap.py

@@ -18,13 +18,21 @@ class GzipWrap(object):
     while True:
       # Attempt to retrieve the next bytes to write.
       is_done = False
-      try:
-        s = self.input.next()
-        self.zipper.write(s)
-      except StopIteration:
-        is_done = True
 
-      if len(self.buffer) < size or is_done:
+      input_size = 0
+      input_buffer = ''
+      while input_size < 1024 * 256:  # 256K buffer to Gzip
+        try:
+          s = self.input.next()
+          input_buffer += s
+          input_size = input_size + len(s)
+        except StopIteration:
+          is_done = True
+          break
+        
+      self.zipper.write(input_buffer)
+
+      if is_done:
         self.zipper.flush()
 
       if len(self.buffer) >= size or is_done: