Trying to return a PDF with rest endpoint

[big_nuggets]

I'm doing this as a response to my GET:

        self.response.setHeader('content-type', 'application/pdf')

        self.response.write(open('/opt/splunk/bin/ffff.pdf','rb').read())

but I receive only a partial base64 of the PDF file and the following error:

(most recent call last): File "/opt/splunk/bin/rest_handler.py", line 79, in <module> print splunk.rest.dispatch(**params) IOError: [Errno 11] Resource temporarily unavailable </msg>

any help is appreciated, thank you