Strange behavior when calling into self.

[yihuang]

Recently i encounter a strange behavior, i'm not sure if it's normal.
The following programs are made only to demonstrate the issue, the real world application is more complex.

from bottle import route, app
import urllib2

@route('/a')
def a():
    return 'a'

@route('/b')
def b():
    urllib2.urlopen('http://localhost:10001/a')
    return 'SUCCESS'

if __name__ == '__main__':
    from wsgiref.simple_server import make_server
    make_server('127.0.0.1', 10001, app()).serve_forever()

$ curl http://localhost:10001/b

This request would block indefinitely.
And if i use gevent, it won't block, but it shows some even more strange behavior.

from gevent import monkey
monkey.patch_all()

from bottle import route, app
import urllib2

@route('/a')
def a():
    return 'a'

@route('/b')
def b():
    urllib2.urlopen('http://localhost:10001/a')
    return 'SUCCESS'

if __name__ == '__main__':
    from gevent.pywsgi import WSGIServer
    WSGIServer(('127.0.0.1', 10001), app()).serve_forever()

$ curl http://localhost:10001/b
S

Currently, i sidestep this issue by spawn a thread to execute the http request.

[foxbunny]

Indeed strange, but I've got to ask: why do you even need to do it?

[defnull]

wsgiref.simple_server is single-threaded. Calling into itself cannot work. It's actually a nice example for a deadlock :)

The second example is indeed strange.