import cgi
from io import BytesIO

f = BytesIO('''--boundary
Content-Disposition: form-data; name="%20%22"


--boundary--''')


env = {
    'REQUEST_METHOD': 'POST',
    'CONTENT_TYPE': 'multipart/form-data; boundary=boundary',
    'CONTENT_LENGTH': '0',
    'QUERY_STRING': '',
}

d = cgi.FieldStorage(fp=f, environ=env, keep_blank_values=True)
assert d.keys() == [' "']