[BUG]Salt-api usgi | rest_cherry

Description

127.0.0.1 - - [12/Jan/2021 03:11:57] "POST / HTTP/1.1" 500 0
Traceback (most recent call last):
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 138, in run
    self.finish_response()
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 180, in finish_response
    self.write(data)
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 266, in write
    "write() argument must be a bytes instance"
AssertionError: write() argument must be a bytes instance
127.0.0.1 - - [12/Jan/2021 03:11:57] "POST / HTTP/1.1" 500 59
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 33872)
Traceback (most recent call last):
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 138, in run
    self.finish_response()
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 180, in finish_response
    self.write(data)
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 266, in write
    "write() argument must be a bytes instance"
AssertionError: write() argument must be a bytes instance

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 141, in run
    self.handle_error()
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 368, in handle_error
    self.finish_response()
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 180, in finish_response
    self.write(data)
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 274, in write
    self.send_headers()
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 331, in send_headers
    if not self.origin_server or self.client_is_modern():
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 344, in client_is_modern
    return self.environ['SERVER_PROTOCOL'].upper() != 'HTTP/0.9'
TypeError: 'NoneType' object is not subscriptable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/socketserver.py", line 320, in _handle_request_noblock
    self.process_request(request, client_address)
  File "/usr/lib64/python3.6/socketserver.py", line 351, in process_request
    self.finish_request(request, client_address)
  File "/usr/lib64/python3.6/socketserver.py", line 364, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/lib64/python3.6/socketserver.py", line 724, in __init__
    self.handle()
  File "/usr/lib64/python3.6/wsgiref/simple_server.py", line 133, in handle
    handler.run(self.server.get_app())
  File "/usr/lib64/python3.6/wsgiref/handlers.py", line 144, in run
    self.close()
  File "/usr/lib64/python3.6/wsgiref/simple_server.py", line 35, in close
    self.status.split(' ',1)[0], self.bytes_sent
AttributeError: 'NoneType' object has no attribute 'split'

Setup

rest_wsgi:
  debug: True
  port: 8001

rest_cherrypy:
  debug: True
  disable_ssl: True
  port: 8002

Steps to Reproduce the behavior
enable salt-api or cherry with epam: pam and try do login to cherrypy or test.ping to wsgi

Expected behavior
A clear and concise description of what you expected to happen.

Versions Report

Salt Version:
          Salt: 3002.2

Dependency Versions:
          cffi: 1.11.5
      cherrypy: 18.4.0
      dateutil: 2.6.1
     docker-py: Not Installed
         gitdb: Not Installed
     gitpython: Not Installed
        Jinja2: 2.10.1
       libgit2: 0.26.8
      M2Crypto: 0.35.2
          Mako: Not Installed
       msgpack: 0.6.2
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: 2.14
      pycrypto: Not Installed
  pycryptodome: Not Installed
        pygit2: 0.26.4
        Python: 3.6.8 (default, Aug 24 2020, 17:57:11)
  python-gnupg: Not Installed
        PyYAML: 3.12
         PyZMQ: 19.0.0
         smmap: Not Installed
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.3.3

System Versions:
          dist: centos 8
        locale: UTF-8
       machine: x86_64
       release: 4.18.0-240.1.1.el8_3.x86_64
        system: Linux
       version: CentOS Linux 

The report points to the salt-api rest_cherry and rest_wsgi entry points; begin by reproducing the PAM login and test.ping requests with the listed Salt, Python, CherryPy, and CentOS versions. Done means these requests no longer produce the shown WSGI errors and their API responses are verified.