title: python-raven on app engine times out on errors
body: <p>I am using python-raven as my sentry client. Unfortunately, when I got an error 500 on my server (caught by raven) my request times out:</p>
  
  <pre><code>E 17:05:57.743 2015-05-13  500       0 B  59.99s /mobile_backend/device/2EBE5887-03EA-458A-B4C4-E57253966231/
    137.194.58.229 - - [13/May/2015:08:05:57 -0700] "GET /mobile_backend/device/2EBE5887-03EA-458A-B4C4-E57253966231/ HTTP/1.1" 500 0 - "Apache-HttpClient/4.2.6 (java 1.5)" "v1.blueberry.xxx-staging.appspot.com" ms=59989 cpu_ms=0 cpm_usd=0.000281 exit_code=119 instance=00c61b117cce7ef8bc8fb86f8aa5315fc96a4d app_engine_release=1.9.20
      E 17:05:57.741 Thread running after request. Creation traceback:
          File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/runtime.py", line 152, in HandleRequest
            error)
          File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 329, in HandleRequest
            return WsgiRequest(environ, handler_name, url, post_data, error).Handle()
          File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 267, in Handle
            result = handler(dict(self._environ), self._StartResponse)
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/django/core/handlers/wsgi.py", line 187, in __call__
            response = self.get_response(request)
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/django/core/handlers/base.py", line 198, in get_response
            signals.got_request_exception.send(sender=self.__class__, request=request)
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/django/dispatch/dispatcher.py", line 198, in send
            response = receiver(signal=self, sender=sender, **named)
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/raven/contrib/django/models.py", line 177, in sentry_exception_handler
            client.captureException(exc_info=sys.exc_info(), request=request)
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/raven/base.py", line 679, in captureException
            'raven.events.Exception', exc_info=exc_info, **kwargs)
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/raven/contrib/django/client.py", line 157, in capture
            result = super(DjangoClient, self).capture(event_type, **kwargs)
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/raven/base.py", line 526, in capture
            self.send(**data)
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/raven/base.py", line 613, in send
            return self.send_encoded(message, auth_header=auth_header)
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/raven/base.py", line 640, in send_encoded
            self.send_remote(url=url, data=message, headers=headers)
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/raven/base.py", line 598, in send_remote
            failed_send)
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/raven/transport/threaded.py", line 169, in async_send
            self.get_worker().queue(
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/raven/transport/threaded.py", line 157, in get_worker
            self._worker = AsyncWorker()
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/raven/transport/threaded.py", line 36, in __init__
            self.start()
          File "/base/data/home/apps/s~xxx-staging/blueberry:v1.384273266847676695/lib/raven/transport/threaded.py", line 113, in start
            self._thread.start()
          File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/threading.py", line 505, in start
            _start_new_thread(self.__bootstrap, ())
          File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/runtime.py", line 82, in StartNewThread
            return base_start_new_thread(Run, ())
      W 17:05:57.743 Threads started by this request continued executing past the hard deadline.
  </code></pre>
  
  <p>The 500 error is correctly reported on Sentry. How can I configure raven to not make timeout my request? </p>