Post unicode string to web service using Python Requests library
<p>I'm trying to post a snippet of text containing fancy unicode symbols to a web service using the <a href="http://docs.python-requests.org/en/latest/" rel="noreferrer">requests</a> library. I'm using Python 3.5.</p>

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

<p>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.</p>

<pre><code>    UnicodeEncodeError                        Traceback (most recent call last)
&lt;ipython-input-125-3ebcae3d7918&gt; in &lt;module&gt;()
     19         print("cleaned : " + line)
     20 
---&gt; 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 
--&gt; 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:
---&gt; 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)
--&gt; 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
--&gt; 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,
--&gt; 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,
--&gt; 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.
--&gt; 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."""
-&gt; 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.
-&gt; 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)
</code></pre>

<p><strong>WORKAROUND:</strong> 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 <a href="https://stackoverflow.com/questions/12013341/removing-characters-of-a-specific-unicode-range-from-a-string">this</a> answer with the following code, since I don't need emoticons and pictures for the analysis:</p>

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

<p><strong>UPDATE</strong> 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:</p>

<pre><code>""Två dagar kvar".encode("utf-8")
</code></pre>