3

The API for Python's wsgiref module precludes hop-by-hop headers (as defined in RFC 2616).

I'm unclear on how to get the server to terminate a connection after a response (since there doesn't seem to be a way to add Connection: close).

This problem comes up in testing small WSGI apps and Bottle micro-services. Calls from curl get blocked by open connections from a browser. I have to click a browser refresh to terminate the connection so that the pending curl request can be answers.

Obviously, this should be a server side decision (terminate connection after a response) rather than client-side. I'm unclear how to implement this.

davidism
  • 121,510
  • 29
  • 395
  • 339
Raymond Hettinger
  • 216,523
  • 63
  • 388
  • 485
  • This may be helpful in your case: https://stackoverflow.com/questions/38079916/how-to-close-the-connection – Ajax1234 Dec 22 '18 at 19:27
  • Thanks @Ajax1234 . The other question is related but doesn't get to the heart of the matter which is "what is the correct way for an app to notify a WSGI server that it needs to terminate a session after fulfilling the response?" The connection-close header is specifically disallowed, so there much be some other way to communicate, "here's your answer, now we're done, goodbye". – Raymond Hettinger Dec 22 '18 at 21:48
  • 1
    AFAIK, there's no way to do this. But couldn't you achieve your aim by using (for example) gevent to handle concurrent requests? – ron rothman Dec 23 '18 at 18:58

1 Answers1

0

This is really predicated on your WSGI server you are hosting your framework via. The best solution with bottle is to run it through gevent. 

botapp = bottle.app()
for Route in (mainappRoute,): #handle multiple files containing routes
    botapp.merge(Route)
botapp = SessionMiddleware(botapp, beakerconfig) #in case you are using beaker sessions
botapp = WhiteNoise(botapp) #in case you want whitenoise to handle static files
botapp.add_files(staticfolder, prefix='static/') #add static route to whitenoise
server = WSGIServer(("0.0.0.0", int(80)), botapp) #gevent async web server
def shutdown():
    print('Shutting down ...')
    server.stop(timeout=60)
    exit(signal.SIGTERM)
gevent.signal(signal.SIGTERM, shutdown)
gevent.signal(signal.SIGINT, shutdown) #CTRL C
server.serve_forever() #spawn the server

You can purge the whitenoise and bottle configs if they aren't necessary, I kept them there as an example, and a suggestion that you use them if this is outward facing.

This is purely asynchronous on every connection.

eatmeimadanish
  • 3,809
  • 1
  • 14
  • 20