[uWSGI] wsgi.file_wrapper works in wsgiref but not uWSGI (and bjoern)

[est]

Hello,

I am experimenting wrapping external process stdin and stdout to a web
service using simple uWSGI.

The demo is like this:


def hello_app(environ, start_response):
start_response('200 OK', [('Content-Type', 'text/plain')])
 proc = subprocess.Popen("echo hello world", shell=True,
stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
return environ['wsgi.file_wrapper'](proc.stdout)


This works in wsgiref

from wsgiref.simple_server import make_server
make_server('', 8086, hello_app).serve_forever()


But not in uWSGI

uwsgi --http 0:8086 --wsgi  bj:hello_app

It returns zero sized http response


(and not working in bjeron, too, shows errno 22.)


Anyone can share any insights of what's going on? What's the proper way if
I want to wrap external program stdout to the interwebz?

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