New submission from Robin Schoonover:
In the reference WSGI server in wsgiref.simple_server, wsgi.input's readline()
hangs if the request body does not actually contain any
newlines.
Consider the following (slightly silly) example:
from wsgiref.simple_server import make_server
def app(environ, start_response):
result = environ['wsgi.input'].readline()
# not reached...
start_response("200 OK", [("Content-Type", "text/plain")])
return []
httpd = make_server('', 8000, app)
httpd.serve_forever()
And the following also silly request (the data kwarg makes it a
POST request):
from urllib.request import urlopen
req = urlopen("http://localhost:8000/";, data=b'some bytes')
print(req)
Normally this isn't a problem, as the reference server isn't intended
for production, and typically the only reason .readline() would be
used is with a request body formatted as multipart/form-data, which
uses ample newlines, including with the content boundaries. However,
for other types of request bodies (such as application/x-www-form-urlencoded)
newlines often wouldn't appear, and using .readline() would wait forever for
new input.
----------
components: Library (Lib)
messages: 221774
nosy: rschoon
priority: normal
severity: normal
status: open
title: wsgi.simple_server's wsgi.input readline waits forever for
non-multipart/form-data
type: behavior
_______________________________________
Python tracker <[email protected]>
<http://bugs.python.org/issue21878>
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