Post unicode string to web service using Python Requests library

Question

I'm trying to post a snippet of text containing fancy unicode symbols to a web service using the requests library. I'm using Python 3.5.

text = "Två dagar kvar"
r = requests.post("http://json-tagger.herokuapp.com/tag", data=text)
print(r.json()

I get an UnicodeEncodeError, but I can't figure out what I'm doing wrong on my side, the docs for requests only talk about unicode in GET requests from what I see.

    UnicodeEncodeError                        Traceback (most recent call last)
<ipython-input-125-3ebcae3d7918> in <module>()
     19         print("cleaned : " + line)
     20 
---> 21         r = requests.post("http://json-tagger.herokuapp.com/tag", data=line)
     22         sentences = r.json()['sentences']
     23         for sentence in sentences:

//anaconda/lib/python3.4/site-packages/requests/api.py in post(url, data, json, **kwargs)
    105     """
    106 
--> 107     return request('post', url, data=data, json=json, **kwargs)
    108 
    109 

//anaconda/lib/python3.4/site-packages/requests/api.py in request(method, url, **kwargs)
     51     # cases, and look like a memory leak in others.
     52     with sessions.Session() as session:
---> 53         return session.request(method=method, url=url, **kwargs)
     54 
     55 

//anaconda/lib/python3.4/site-packages/requests/sessions.py in request(self, method, url, params, data, headers, cookies, files, auth,     timeout, allow_redirects, proxies, hooks, stream, verify, cert, json)
    466         }
    467         send_kwargs.update(settings)
--> 468         resp = self.send(prep, **send_kwargs)
    469 
    470         return resp

//anaconda/lib/python3.4/site-packages/requests/sessions.py in send(self, request, **kwargs)
    574 
    575         # Send the request
--> 576         r = adapter.send(request, **kwargs)
    577 
    578         # Total elapsed time of the request (approximately)

//anaconda/lib/python3.4/site-packages/requests/adapters.py in send(self, request, stream, timeout, verify, cert, proxies)
    374                     decode_content=False,
    375                     retries=self.max_retries,
--> 376                     timeout=timeout
    377                 )
    378 

//anaconda/lib/python3.4/site-packages/requests/packages/urllib3/connectionpool.py in urlopen(self, method, url, body, headers, retries,     redirect, assert_same_host, timeout, pool_timeout, release_conn, **response_kw)
    557             httplib_response = self._make_request(conn, method, url,
    558                                                   timeout=timeout_obj,
--> 559                                                   body=body, headers=headers)
    560 
    561             # If we're going to release the connection in ``finally:``, then

//anaconda/lib/python3.4/site-packages/requests/packages/urllib3/connectionpool.py in _make_request(self, conn, method, url, timeout,     **httplib_request_kw)
    351         # conn.request() calls httplib.*.request, not the method in
    352         # urllib3.request. It also calls makefile (recv) on the socket.
--> 353         conn.request(method, url, **httplib_request_kw)
    354 
    355         # Reset the timeout for the recv() on the socket

//anaconda/lib/python3.4/http/client.py in request(self, method, url, body, headers)
   1086     def request(self, method, url, body=None, headers={}):
   1087         """Send a complete request to the server."""
-> 1088         self._send_request(method, url, body, headers)
   1089 
   1090     def _set_content_length(self, body):

//anaconda/lib/python3.4/http/client.py in _send_request(self, method, url, body, headers)
   1123             # RFC 2616 Section 3.7.1 says that text default has a
   1124             # default charset of iso-8859-1.
-> 1125             body = body.encode('iso-8859-1')
   1126         self.endheaders(body)
   1127 

UnicodeEncodeError: 'latin-1' codec can't encode characters in position 14-15: ordinal not in range(256)

WORKAROUND: I remove all unicode characters from the text from the "emoticon" block, U+1F600 - U+1F64F and Symbols And Pictographs" block, U+1F300 - U+1F5FF according to this answer with the following code, since I don't need emoticons and pictures for the analysis:

text = re.sub(r'[^\u1F600-\u1F64F ]|[^\u1F300-\u1F5FF ]',"",text)

UPDATE The creator of the web service has fixed this now and updated the documentation. All you have to do is to send an encoded string, in Python 3:

""Två dagar kvar".encode("utf-8")

You can check if that requests library can do requests using another encoding than iso-8859-1. (I'd guess it does, not being able to do that would be a crippling limitation these days). For your workaround, you need to remove all characters above U+00FF, which only leaves you with a small subset of the Latin character set. — roeland, Jan 05 '16 at 22:12

score 26 · Accepted Answer · answered Jan 06 '16 at 06:43

It is not clear what content type json-tagger.herokuapp.com expects (the examples are contradictory). You could try to post the data as text:

#!/usr/bin/env python
import requests  # pip install requests

r = requests.post(url,
                  data=text.encode('utf-8'),
                  headers={'Content-type': 'text/plain; charset=utf-8'})
print(r.json())

Or you could try to send it as application/x-www-form-urlencoded:

#!/usr/bin/env python
import requests  # pip install requests

r = requests.post(url, data=dict(data=text))
print(r.json())

The server may reject both, accept both, accept one but not the other, or expect some other format (e.g., application/json), etc.

Post unicode string to web service using Python Requests library

1 Answers1