This site is accessible outside of our firewall. But the request is something like http://test.ourdomain.org/books. I contacted F5 support and there response is below. Looks like we might have to adjust our read/write timeout. I'll have to look deeper into to this, I don't want to screw up the other web accel applications.
SOL9367: HTTP 503 Service Unavailable response: An error occurred while fetching the URI. Please retry.
https://support.f5.com/kb/en-us/solutions/public/9000/300/sol9367.html
Here's the content:
" For client requests to a BIG-IP WebAccelerator-enabled virtual server, if the BIG-IP WebAccelerator does not receive a response from the origin web server within the Read/Write Timeout value, the BIG-IP WebAccelerator sends the client an HTTP 503 Service Unavailable response that appears similar to the following example :
An error occured while fetching the URI. Please retry.
The default Read/Write Timeout value is 30 seconds with two retries. "
You will have more information looking at: https://support.f5.com/kb/en-us/products/wa.html via the administrator Guide.