Develop Reference

Connection errors due to webpage navigation

I am having some trouble with connection errors in my Django app when a user navigates to a different page before AJAX call is finished.
So, when the client-side sends several AJAX calls for save/load/retrieve data etc., and when a user navigates to a different page - say when an AJAX call was just made from the client side to save the content, the content is saved and the functionally everything is fine, but I keep getting this error:
Exception happened during processing of request from ('127.0.0.1', 50646)
Traceback (most recent call last):
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 138, in run
self.finish_response()
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 180, in finish_response
self.write(data)
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 274, in write
self.send_headers()
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 332, in send_headers
self.send_preamble()
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 255, in send_preamble
('Date: %s\r\n' % format_date_time(time.time())).encode('iso-8859-1')
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 453, in _write
result = self.stdout.write(data)
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\socket.py", line 594, in write
return self._sock.send(b)
ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 141, in run
self.handle_error()
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\site-packages\django\core\servers\basehttp.py", line 88, in handle_error
super(ServerHandler, self).handle_error()
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 368, in handle_error
self.finish_response()
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 180, in finish_response
self.write(data)
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 274, in write
self.send_headers()
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 331, in send_headers
if not self.origin_server or self.client_is_modern():
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 344, in client_is_modern
return self.environ['SERVER_PROTOCOL'].upper() != 'HTTP/0.9'
TypeError: 'NoneType' object is not subscriptable
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\socketserver.py", line 625, in process_request_thread
self.finish_request(request, client_address)
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\socketserver.py", line 354, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\socketserver.py", line 681, in __init__
self.handle()
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\site-packages\django\core\servers\basehttp.py", line 155, in handle
handler.run(self.server.get_app())
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\handlers.py", line 144, in run
self.close()
File "D:\Applications\WinPython-64bit-3.5.3.1Qt5\python-3.5.3.amd64\lib\wsgiref\simple_server.py", line 36, in close
self.status.split(' ',1)[0], self.bytes_sent
AttributeError: 'NoneType' object has no attribute 'split'
For example, an AJAX call for the URL /xyz/save/ is sent, and before its callback is executed on the client side, the user navigates to a URL /xyz/abc, I get the above error. I understand that the connection for /xyz/save/ is interrupted, how do I avoid this?

Python wsgi server http streaming m4a file

I'm trying to stream m4a file over http using a simple wsgi server in python.
My code is like this:
mp3file = urllib2.urlopen(media_url)
data = mp3file.read()
headers = [('Content-type', 'audio/mp4'), ('Accept-Ranges', 'bytes')]
write = start_response('200 OK', headers)
write(data)
The problem is that if I set 'Content-Length' header like below, the client (Chrome browser for example) doesn't play the media. And if I don't set this header, it does play the media, but it doesn't know the length of the media so I can't seek/fast forward over the media file.
headers = [('Content-type', 'audio/mp4'), ('Content-Length', mp3file.headers['Content-Length']), ('Accept-Ranges', 'bytes')]
When setting the header I get this on console:
Traceback (most recent call last):
File "C:\Python27\lib\wsgiref\handlers.py", line 86, in run
self.finish_response()
File "C:\Python27\lib\wsgiref\handlers.py", line 128, in finish_response
self.write(data)
File "C:\Python27\lib\wsgiref\handlers.py", line 217, in write
self._write(data)
File "C:\Python27\lib\socket.py", line 324, in write
self.flush()
File "C:\Python27\lib\socket.py", line 303, in flush
self._sock.sendall(view[write_offset:write_offset+buffer_size])
error: [Errno 10053] An established connection was aborted by the software in your host machine
127.0.0.1 - - [28/Sep/2015 16:37:20] "GET /?yb=QfCqNbzJi3k HTTP/1.1" 500 59
Traceback (most recent call last):
File "C:\Python27\lib\SocketServer.py", line 295, in _handle_request_noblock
self.process_request(request, client_address)
File "C:\Python27\lib\SocketServer.py", line 321, in process_request
self.finish_request(request, client_address)
File "C:\Python27\lib\SocketServer.py", line 334, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "C:\Python27\lib\SocketServer.py", line 653, in __init__
self.finish()
File "C:\Python27\lib\SocketServer.py", line 712, in finish
self.wfile.close()
File "C:\Python27\lib\socket.py", line 279, in close
self.flush()
File "C:\Python27\lib\socket.py", line 303, in flush
self._sock.sendall(view[write_offset:write_offset+buffer_size])
error: [Errno 10053] An established connection was aborted by the software in your host machine

Exception happened during processing of request from IOS Device

I am trying to play a video on an iOS device. When I tried to play i got the following error:
[27/Apr/2015 06:59:30] "GET /media/2015/04/VID_20150327_112644.mp4 HTTP/1.1" 200 18
Exception happened during processing of request from ('192.168.1.230', 51412)
Traceback (most recent call last):
File "/usr/lib/python2.7/SocketServer.py", line 593, in process_request_thread
self.finish_request(request, client_address)
File "/usr/lib/python2.7/SocketServer.py", line 334, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/home/likewise-open/ZEALOUSYS/manesh/virtualenv/tracks/local/lib/python2.7/site-packages/django/core/servers/basehttp.py", line 129, in __init__
super(WSGIRequestHandler, self).__init__(*args, **kwargs)
File "/usr/lib/python2.7/SocketServer.py", line 651, in __init__
self.finish()
File "/usr/lib/python2.7/SocketServer.py", line 710, in finish
self.wfile.close()
File "/usr/lib/python2.7/socket.py", line 279, in close
self.flush()
File "/usr/lib/python2.7/socket.py", line 303, in flush
self._sock.sendall(view[write_offset:write_offset+buffer_size])
error: [Errno 32] Broken pipe
----------------------------------------
Exception happened during processing of request from ('192.168.1.230', 51412)
Traceback (most recent call last):
File "/usr/lib/python2.7/SocketServer.py", line 593, in process_request_thread
self.finish_request(request, client_address)
File "/usr/lib/python2.7/SocketServer.py", line 334, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/home/likewise-open/ZEALOUSYS/manesh/virtualenv/tracks/local/lib/python2.7/site-packages/django/core/servers/basehttp.py", line 129, in __init__
super(WSGIRequestHandler, self).__init__(*args, **kwargs)
File "/usr/lib/python2.7/SocketServer.py", line 651, in __init__
self.finish()
File "/usr/lib/python2.7/SocketServer.py", line 710, in finish
self.wfile.close()
File "/usr/lib/python2.7/socket.py", line 279, in close
self.flush()
File "/usr/lib/python2.7/socket.py", line 303, in flush
self._sock.sendall(view[write_offset:write_offset+buffer_size])
error: [Errno 32] Broken pipe
----------------------------------------
The video file of all formats is working perfectly in all browsers and Android devices. When I try to access it from an iOS device. It gives me the above error. As you can see in error, first it is giving me response as 200 and then there is broken pipe. What does this broken pipe even mean? Just FYI, I have already posted a question stating that I can't play video on iOS devices, I am now posting a new question because I found this error in my terminal.
How do i fix this issue? Any help is appreciated.

This is beacause django is handling your media files not apache.Try by changing you configuration in server.
For example inside your apache2 edit example.com.conf file add following lines so that apache will serve media files.
**Alias /media /your project path/media**
Sometimes this may fix this issue.

Multiple Entries in Database getting saved along with error: [Errno 32] Broken pipe in terminal

In my application I am trying to save a simple entry with the help of the following code.
if form.is_valid():
f=form.save(commit = False)
f.Questionair=qset
f.questionnumber = f.Questionair.questions_set.all().count()+1
f.save()
return redirect('/feedback/create/'+str(fbid))
What is happening is as soon as this code is executed using runserver I get the following error in the terminal.
Exception happened during processing of request from ('127.0.0.1', 36076)
Traceback (most recent call last):
File "/usr/lib/python2.7/SocketServer.py", line 593, in process_request_thread self.finish_request(request, client_address)
File "/usr/lib/python2.7/SocketServer.py", line 334, in finish_request self.RequestHandlerClass(request, client_address, self)
File "/usr/local/lib/python2.7/dist-packages/django/core/servers/basehttp.py", line 126, in __init__ super(WSGIRequestHandler, self).__init__(*args, **kwargs)
File "/usr/lib/python2.7/SocketServer.py", line 651, in __init__ self.finish()
File "/usr/lib/python2.7/SocketServer.py", line 710, in finish self.wfile.close()
File "/usr/lib/python2.7/socket.py", line 279, in close self.flush()
File "/usr/lib/python2.7/socket.py", line 303, in flush self._sock.sendall(view[write_offset:write_offset+buffer_size])
error: [Errno 32] Broken pipe
Along with this the entry is saved twice in the database. This does not happen everytime but 3 out of 4 time I am facing this issue. I am using Ubuntu 13.10 and Django 1.6

urlfetch DeadlineExceededError

I had a create a REST API using bottle framework, which receives calls from GAE. Once this REST API is invoked, it did some calculations and sent outputs as a zip file to AMAZON S3 server and return the link to GAE. Everything works fine expect the timeout issue. I tried to adjust the deadline of urlfetch to 60 seconds, which did not solve the problem. I appreciate any suggestions.
GAE side:
response = urlfetch.fetch(url=url, payload=data, method=urlfetch.POST, headers=http_headers, deadline=60)
Broser error info.:
Traceback (most recent call last):
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1535, in __call__
rv = self.handle_exception(request, response, e)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1529, in __call__
rv = self.router.dispatch(request, response)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1278, in default_dispatcher
return route.handler_adapter(request, response)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1102, in __call__
return handler.dispatch()
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 572, in dispatch
return self.handle_exception(e, self.app.debug)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 570, in dispatch
return method(*args, **kwargs)
File "D:\Dropbox\ubertool_src\przm5/przm5_output.py", line 22, in post
przm5_obj = przm5_rest_model.przm5(args)
File "D:\Dropbox\ubertool_src\przm5\przm5_rest_model.py", line 351, in __init__
self.convertSoil1, self.convert1to3, self.convert2to3)
File "D:\Dropbox\ubertool_src\przm5\przm5_rest_model.py", line 135, in get_jid
response = urlfetch.fetch(url=url, payload=data, method=urlfetch.POST, headers=http_headers)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\urlfetch.py", line 270, in fetch
return rpc.get_result()
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\apiproxy_stub_map.py", line 612, in get_result
return self.__get_result_hook(self)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\urlfetch.py", line 410, in _get_fetch_result
'Deadline exceeded while waiting for HTTP response from URL: ' + url)
DeadlineExceededError: Deadline exceeded while waiting for HTTP response from URL: http://localhost:7777/my_model
REST server:
#route('/my_model', method='POST')
#auth_basic(check)
def my_model():
#run the model
run_my model()
#zip output files
zout=zipfile.ZipFile("test.zip","w")
for name in os.listdir(src1):
zout.write(name)
zout.close()
##upload file to S3
conn = S3Connection(key, secretkey)
bucket = Bucket(conn, 'przm5')
k=Key(bucket)
name1='PRZM5_'+name_temp+'.zip'
k.key=name1
###All the above steps are fine####
k.set_contents_from_filename('test.zip')
link='https://s3.amazonaws.com/'+my_file_path
return {'ff': ff}
run(host='localhost', port=7777, debug=True)
Errors from the REST server:
127.0.0.1 - - [07/Jan/2014 16:16:36] "POST /my_model HTTP/1.1" 200 1663
Traceback (most recent call last):
File "C:\Python27\Lib\wsgiref\handlers.py", line 86, in run
self.finish_response()
File "C:\Python27\Lib\wsgiref\handlers.py", line 128, in finish_response
self.write(data)
File "C:\Python27\Lib\wsgiref\handlers.py", line 212, in write
self.send_headers()
File "C:\Python27\Lib\wsgiref\handlers.py", line 270, in send_headers
self.send_preamble()
File "C:\Python27\Lib\wsgiref\handlers.py", line 194, in send_preamble
'Date: %s\r\n' % format_date_time(time.time())
File "C:\Python27\Lib\socket.py", line 324, in write
self.flush()
File "C:\Python27\Lib\socket.py", line 303, in flush
self._sock.sendall(view[write_offset:write_offset+buffer_size])
error: [Errno 10053] An established connection was aborted by the software in your host machine
127.0.0.1 - - [07/Jan/2014 16:16:36] "POST /my_model HTTP/1.1" 500 59
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 50953)
Traceback (most recent call last):
File "C:\Python27\Lib\SocketServer.py", line 295, in _handle_request_noblock
self.process_request(request, client_address)
File "C:\Python27\Lib\SocketServer.py", line 321, in process_request
self.finish_request(request, client_address)
File "C:\Python27\Lib\SocketServer.py", line 334, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "C:\Python27\Lib\SocketServer.py", line 651, in __init__
self.finish()
File "C:\Python27\Lib\SocketServer.py", line 710, in finish
self.wfile.close()
File "C:\Python27\Lib\socket.py", line 279, in close
self.flush()
File "C:\Python27\Lib\socket.py", line 303, in flush
self._sock.sendall(view[write_offset:write_offset+buffer_size])
error: [Errno 10053] An established connection was aborted by the software in your host machine

The deadline is a maximum value, once reached it'll fail. And it's failing with
Deadline exceeded while waiting for HTTP response
So you should try to catch that exception and try again.
If the entire operation can't be done in under 60 seconds then there is nothing else to be done, it's a hard limit in GAE that HTTP requests can't exceed 60 seconds.