Android Httpurlconnection.getresponsecode () Error resolution _android

Lead: Personal contact with the network is not much, in the use of their own found some problems, record.

text: I use Httpurlconnection.getresponsecode () when the direct error is ioexception errors, Responsecode =-1. have been trying to understand that the same program I called two times, the result has a link has been OK, the other has been reported this error. Later found that the difference between two links, there is a return of the content is empty, so caused this error.

Workaround:

Method 1, the Web page return content cannot be empty;
Method 2, do not use this interface slightly.