Lost in zoofcgi.py when stream content-type is not text/html

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Lost in zoofcgi.py when stream content-type is not text/html

22 Oct 2014, 07:47

Greetings.
I'm trying to migrate a python web application working fine with mod_wsgi from Apache to IIS.
Helicon Zoo module had rather done most of the job but seems to have a problem with binary streams.

From my workout, all streams from the web application with content-type = text/html in the header will display fine...
Apache version : http://invenio-demo.cern.ch/
IIS version : http://atlantis.unidep.org/

But when the content-type is different from that in the header (tried application/pdf, image/gif and image/jpeg), so when the content type is a pure binary stream, it's a no go...
This link works fine on Apache : http://invenio-demo.cern.ch/record/97/files/convert_SCAN-0005061.pdf
The same will fail on IIS : http://atlantis.unidep.org//record/97/files/convert_SCAN-0005061.pdf

Basically, for hyperlinks to files, the web application will read the file name on the hardrive, read its binary contents and transmits all the data with the correct headers to the wsgi. I've double checked all that so the application is not the problem.
It works with mod_wsgi but zoofcgi seems to have a problem with that and I confirm that Zoofcgi indeed receives the correct binary output stream he is supposed to respond from the web application.

Additionally, (checked it with image/gif content-type) , it seems zoofcgi responds to the client by sending the right header but only the 'first set' of the data it reads internally resulting on errors on the client...
Example : http://atlantis.unidep.org//record/7/files/9806033.gif?subformat=icon
Zoofcgi received the right stream from the application, correctly send the headers to the client, but not all the data...

Kindly help.

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Posts: 402
Joined: 06 Mar 2012, 11:59

Re: Lost in zoofcgi.py when stream content-type is not text/

22 Oct 2014, 10:47

Hello!

Have you used Ruby project template to install sinatra as explained in this instruction https://www.helicontech.com/zoo/docs/ruby-sinatra.html
If yes, then there are URL Rewrite rules in web.config for static files, your program may interfere with them. Please try to remove these rules from web.config. Another solution would be to keep these rules and move your static files into the /static/ folder in the project - the files will be processed by IIS then without Sinatra involved.

I understand this might be a bug in Helicon Zoo, so please send us your Sinatra code that is sending binary files, so we can try to reproduce the situation locally.

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Joined: 06 Mar 2012, 11:59

Re: Lost in zoofcgi.py when stream content-type is not text/

22 Oct 2014, 11:00

Sorry, I messed with another post. I meant Python project of course, not Sinatra. All the rest is the same, only I suppose you where using Python instruction instead: https://www.helicontech.com/zoo/docs/python-wsgi.html

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Re: Lost in zoofcgi.py when stream content-type is not text/

22 Oct 2014, 11:06

And I noticed double trailing slash in yout IIS version of link, maybe this is the problem? Should be http://atlantis.unidep.org/record/97/fi ... 005061.pdf

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Re: Lost in zoofcgi.py when stream content-type is not text/

23 Oct 2014, 09:22

@ Yaroslav thx for your reply. I've finally sorted it out this night after testing a simple file streaming directly with zoofcgi and it worked.

It appears that the Apache version of the application used to open a file wrapper, send a header and parts of the file to stream to the python mod_wsgi and finally, after all the file wrapper was treated, the application would do :
Code: Select all
raise apache.SERVER_RETURN, apache.DONE

But with IIS , when the wsgi headers and the first part of the file wrapper are sent to zoofcgi, the header is sent in the response to the client , then the first buffer of the file data and then zoofcgi flushes the stream...
notice line 832 of the worker:
Code: Select all
            req.stdout.flush()

This is the problem...
Useless to say IIS doesn't care
Code: Select all
raise apache.SERVER_RETURN, apache.DONE


My solution was to go back to my web application and open the file to be streamed with
Code: Select all
open
instead of using
Code: Select all
Filewrapper
and then send the whole thing to zoofcgi and voila...

But it should be great if the zoofcgi could send a kind of 'end of wsgi request' to the client at the end of the streaming before flushing, this could have helped me to troubleshoot my problem earlier...and also prevent the client from waiting data that would never come ;)

Cheers.

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