avoid out of range error from googlebot

[BlueShadow]

Hi,
to increase my speed I have a fast downloadfunction for my images:

def fast_download():
   session.forget(response)
   cache.action(time_expire=604800)(lambda: 0)()
   # very basic security (only allow fast_download on your_table.upload_field):
   if not request.args(0).startswith("Images."):
       return download()
   
   #---------check which picture we are allowed to display--------
   #----get the db entry and determine whether it is a small or big pic----
   rows=db(db.Images.thumb == request.args(0)).select()
   try:
       rows[0]
   except:
       small=0
       rows=db(db.Images.Image == request.args(0)).select()
   else:
       small=1

   #print rows[0],small
   row=rows[0]
   if ...#some stuff to determine which image is shown (not relevant)


   from PIL import Image
   img=row.thumb
   filename = os.path.join(request.folder,'uploads',img)

       return response.stream(open(filename,'rb'))

which works quite good.
My Problem is that the google image bot tries quite frequently to access the function directly. which gives an out of range error. (268 in the last 3 weeks)
part of one error ticket:

File "/home/www-data/web2py/applications/Movie_Alarm/controllers/default.py", line 327, in fast_download
    row=rows[0]

HTTP_FROM	:	googlebot(at)googlebot.com
HTTP_USER_AGENT	:	Googlebot-Image/1.0

REQUEST_URI

:

/fast_download/Images.thumb.a791255ac1014c88.7466d626e61696c2e6a7067.jpg

I tried to put fast_download in the disallowed part of the robots.txt
but it seems to have no effect.
and I hate having so many errors in my error database :)
have you guys any ideas how I can prevent this from happening again?

[Niphlod]

shouldn't this question be raised to google than web2py ?
if this is unsolvable, wrap the entire thing in a try except raising a HTTP(404) to avoid logging the error.

[Kevin Bethke]

that was the answer I was looking for. how do I direct the request to a 404 page or some other function?

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[Niphlod]

raise HTTP(404)

http://web2py.com/books/default/chapter/29/04/the-core?search=raise#HTTP-and-redirect