py3 sdk harness status server does not print thread stack

The calls are failing with

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Exception happened during processing of request from ('127.0.0.1', 56106)
Traceback (most recent call last):
File "/usr/lib/python3.6/socketserver.py", line 320, in _handle_request_noblock
self.process_request(request, client_address)
File "/usr/lib/python3.6/socketserver.py", line 351, in process_request
self.finish_request(request, client_address)
File "/usr/lib/python3.6/socketserver.py", line 364, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/usr/lib/python3.6/socketserver.py", line 724, in _init_
self.handle()
File "/usr/lib/python3.6/http/server.py", line 418, in handle
self.handle_one_request()
File "/usr/lib/python3.6/http/server.py", line 406, in handle_one_request
method()
File "a.py", line 70, in do_GET
self.wfile.write(line)
File "/usr/lib/python3.6/socketserver.py", line 803, in write
self._sock.sendall(b)
TypeError: a bytes-like object is required, not 'str'