Hello,
I am trying to build a very simple data loading python script for my
Java servlet based appengine app. Unfortunately python can't seem to
open an URL from appengine (or the development server anyway). If you
just start with the eclipse appengine project template (call the
project fetchtest) then a single servlet will be generated like:
import java.io.IOException;
import javax.servlet.http.*;
@SuppressWarnings("serial")
public class FetchTestServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
resp.setContentType("text/plain");
resp.getWriter().println("Hello, world");
}
}
It will serve by default on: http://localhost:8888/fetchtest
I then write the python script:
import urllib2
import sys
import time
for i in range(10):
try:
print urllib2.urlopen('http://localhost:8888/
fetchtest').read()
except:
print "Unexpected error:", sys.exc_info()
time.sleep(1)
Well, the first time in the python loop the fetch succeeds, but fails
after that. In fact if I run the script again all the calls will
fail. It only ever works the first time I load the URL after
restarting the server. In fact if I load the url in a browser once
then the script fails on even the first loop iteration. The python
output looks like:
>python ../util/test.py
Hello, world
Unexpected error: (<class 'socket.error'>, error(54, 'Connection reset
by peer'), <traceback object at 0x101044560>)
Unexpected error: (<class 'socket.error'>, error(54, 'Connection reset
by peer'), <traceback object at 0x1010447e8>)
Unexpected error: (<class 'socket.error'>, error(54, 'Connection reset
by peer'), <traceback object at 0x1010444d0>)
Unexpected error: (<class 'socket.error'>, error(54, 'Connection reset
by peer'), <traceback object at 0x101044758>)
Unexpected error: (<class 'socket.error'>, error(54, 'Connection reset
by peer'), <traceback object at 0x101044560>)
Unexpected error: (<class 'socket.error'>, error(54, 'Connection reset
by peer'), <traceback object at 0x1010447e8>)
Unexpected error: (<class 'socket.error'>, error(54, 'Connection reset
by peer'), <traceback object at 0x1010444d0>)
Unexpected error: (<class 'socket.error'>, error(54, 'Connection reset
by peer'), <traceback object at 0x101044758>)
Unexpected error: (<class 'socket.error'>, error(54, 'Connection reset
by peer'), <traceback object at 0x101044560>)
I've tried catching all exceptions and inspecting what state I know
how to on the server side, but it seems like there is no error at all
in the servlet. I've tried carefully reading and closing all the
different input and output streams in the request and response objects
to no avail. Can anyone help me debug why this doesn't work? I
really don't know where to look.
Thanks,
Matt
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