Lengthy scope preview data causes HTTP Error 414

[Michał Karnicki]

If the scope preview data is too long (and it is sent in the URL), it causes 414 on the server.

ubuntu-rest-scope make start output:

---
(successful surfacing request)
"127.0.0.1 - - [12/May/2014:15:50:46] "GET /<snip>/search?longitude=21.0&q=&platform=dekstop&latitude=52.25&session_id=67508cac-d9dc-11e3-9a5e-08606e7f7bc8 HTTP/1.1" 200 49011 "-" "Python-urllib/3.4"

(failed preview request)
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/gevent/greenlet.py", line 327, in run
    result = self._run(*self.args, **self.kwargs)
  File "/usr/lib/python2.7/dist-packages/gevent/pywsgi.py", line 658, in handle
    handler.handle()
  File "/usr/lib/python2.7/dist-packages/gevent/pywsgi.py", line 193, in handle
    self.log_request()
  File "/usr/lib/python2.7/dist-packages/gunicorn/workers/ggevent.py", line 152, in log_request
    resp = GeventResponse(self.status, self.response_headers,
AttributeError: 'PyWSGIHandler' object has no attribute 'response_headers'
<Greenlet at 0x2af43872acd0: <bound method PyWSGIServer.handle of <PyWSGIServer at 0x2af436aa5190 fileno=5 address=0.0.0.0:8000>>(<socket at 0x2af436aa5410 fileno=[Errno 9] Bad fil, ('127.0.0.1', 42231))> failed with AttributeError
---

ubuntu-rest-scope check_scopes result:

---
<snip>
 'title': '<snip>',
 'uri': '<snip>'}

Preview? 0

Previewing...
Error: HTTP Error 414: Request URI Too Long b''
---