On 12 July 2012 16:45, Jason Garber <[email protected]> wrote:
> Hello,
>
> I have a very odd situation.
>
> mod_wsgi 3.3 on RHEL 5 x86_64
>
>
> If I raise an exception in an html-generating function, it is caught just
> fine by my WSGI framework with a try/except block.
>
> If I raise the exact same exception within a plain function called from the
> same place, it causes a 500 internal server error: mod_wsgi (pid=17007):
> Exception occurred processing WSGI script
> '/home/jason/Code/WhiteBoot4/DevLevel.2/TMTManage/WSGI/Dashboard.wsgi'
>
> I can place an explicit try/except around that exact spot, and it is
> completely skipped. It's really bizarre. Any ideas?
>
> Here is a simple example. Note that I have actually reproduced it with this
> level of simplicity.
>
> def FunctionCalledByWSGIFile():
> try:
> RenderHTML()
> except Exception as e:
> # output error here
> ...
>
> def RenderHTML():
> ...
> # This way works fine
> raise Exception("foo")
> ...
> # This way causes 500 internal server error
> data = Select()
>
> def Select():
> raise Exception("foo")
I have no problem with the following constructed based on what you give.
In both cases will print 'EXCEPTION foo' to log file.
There is no 500 error as the exception is not reraised in that example.
Try using a blind 'except' with type and then use:
except Exception as e:
print 'EXCEPTION', e
except:
import traceback, sys
traceback.print_exception(*sys.exc_info())
to see what happens.
Original full test script I used is:
def FunctionCalledByWSGIFile():
try:
RenderHTML()
except Exception as e:
print 'EXCEPTION', e
def RenderHTML():
# This way works fine
#raise Exception("foo")
# This way causes 500 internal server error
data = Select()
def Select():
raise Exception("foo")
def application(environ, start_response):
status = '200 OK'
output = 'Hello World!'
response_headers = [('Content-type', 'text/plain'),
('Content-Length', str(len(output)))]
start_response(status, response_headers)
FunctionCalledByWSGIFile()
return [output]
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