Spacy: AssertionError: Status must be a string

[irfan-zoefit]

Displacy throws error while running the server and checking the dependencies in the browser on 0.0.0.0:5000.

from __future__ import unicode_literals, print_function
import spacy
from spacy import displacy

text = 'But Google is starting from behind.'

nlp = spacy.load('en_core_web_sm')
doc = nlp(text)
for word in doc:
    print(word.text, word.tag_, word.dep_)
displacy.serve(doc, style='dep')

Here is the error:

Traceback (most recent call last):
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 85, in run
    self.result = application(self.environ, self.start_response)
  File "/home/irfan/PycharmProjects/nightly/.night/local/lib/python2.7/site-packages/spacy/displacy/__init__.py", line 68, in app
    start_response('200 OK', [('Content-type', 'text/html; charset=utf-8')])
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 173, in start_response
    assert type(status) is StringType,"Status must be a string"
AssertionError: Status must be a string
127.0.0.1 - - [26/Jul/2017 10:15:57] "GET /favicon.ico HTTP/1.1" 500 59

Info about spaCy

• Python version: 2.7.12
• Platform: Linux-4.4.0-87-generic-x86_64-with-Ubuntu-16.04-xenial
• spaCy version: 2.0.0a6

[ines]

Hmm, interesting! Thanks for the report – haven't seen this error before. This seems to be related to wsgiref (which we used to avoid additional dependencies just for the simple displaCy server – but maybe we should re-think that decision).

It's a bit confusing, though, because the displaCy server implementation is pretty much identical to the wsgiref example app, and '200 OK' should definitely be a string... Will look into this!

Edit with possible solution: Might be a Python 2/3 issue – that status should be encoded in Python 2, and a string in Python 3. Since we have unicode literals set on the file, the string has a different type. If you have a second and want to quickly test it locally, try changing line 68 to:

start_response(b'200 OK', [('Content-type', 'text/html; charset=utf-8')]) 

(This will obviously only work on Python 2. So in spaCy, we'll use our compat module to write Python 2/3-specific rules here.)

[irfan-zoefit]

Well, it does not solve the problem either.
it shows following error after using

start_response(b'200 OK', [('Content-type', 'text/html; charset=utf-8')]) 

Error:

Traceback (most recent call last):
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 85, in run
    self.result = application(self.environ, self.start_response)
  File "/home/irfan/PycharmProjects/nightly/.night/local/lib/python2.7/site-packages/spacy/displacy/__init__.py", line 68, in app
    start_response(b'200 OK', [('Content-type', 'text/html; charset=utf-8')])
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 179, in start_response
    assert type(name) is StringType,"Header names must be strings"
AssertionError: Header names must be strings
127.0.0.1 - - [31/Jul/2017 13:54:04] "GET / HTTP/1.1" 500 59
Traceback (most recent call last):
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 85, in run
    self.result = application(self.environ, self.start_response)
  File "/home/irfan/PycharmProjects/nightly/.night/local/lib/python2.7/site-packages/spacy/displacy/__init__.py", line 68, in app
    start_response(b'200 OK', [('Content-type', 'text/html; charset=utf-8')])
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 179, in start_response
    assert type(name) is StringType,"Header names must be strings"
AssertionError: Header names must be strings
127.0.0.1 - - [31/Jul/2017 13:54:04] "GET /favicon.ico HTTP/1.1" 500 59

I've changed the line to

start_response(b'200 OK', [(b'Content-type', b'text/html; charset=utf-8')])

Now it's working fine.

[ines]

Ahhh, sorry – damn strings in Python 2/3. Thanks for getting to the bottom of this. Will be fixed!

[lock[bot]]

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