Server returned http response code:999

[Sarah Gaikwad]

Hi,
I have multiple threads that use a set of httpurlconnections. I read the contents line by line. From each line , I pick a particular value based on a criteria and put this into a file. FOr example I open 5 httpurlconnections as threads and pick values from each urlconnection based on a criteria. These values are then written into a file on my system. The urlconnections I need to open are more than 1000. When my progaram executes at a point I get Server returned http response code:999.
I tried hard for what the error means. Is there someone who can guide me please,
Thanks a ton

[Ernest Friedman-Hill]

The highest-numbered response code defined in HTTP 1.1 is 505, so 999 is not a legal response code. What server is this? Maybe it's the "something's horribly broken" response unique to that server.