Doing some local development with Titanium and I noticed that when using the xhr object to hit my localhost server (idxdot.dev), and testing using the emulator, I got this error:

(TiHttpClient-1) [7,236164] HTTP Error (java.net.UnknownHostException): idxdot.dev
E/TiHttpClient( 417): java.net.UnknownHostException: idxdot.dev
E/TiHttpClient( 417): at java.net.InetAddress.lookupHostByName(InetAddress.java:513)
E/TiHttpClient( 417): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:278)
E/TiHttpClient( 417): at java.net.InetAddress.getAllByName(InetAddress.java:242)
E/TiHttpClient( 417): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:136)
E/TiHttpClient( 417): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
E/TiHttpClient( 417): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
E/TiHttpClient( 417): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:348)
E/TiHttpClient( 417): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
E/TiHttpClient( 417): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:653)
E/TiHttpClient( 417): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:637)
E/TiHttpClient( 417): at ti.modules.titanium.network.TiHTTPClient$ClientRunnable.run(TiHTTPClient.java:1017)
E/TiHttpClient( 417): at java.lang.Thread.run(Thread.java:1096)
I/TiHttpClient( 417): (TiHttpClient-1) [24,236188] Sending error idxdot.dev

I have idxdot.dev set up as a virtual host on my machine, and I can hit it fine doing my local development but not just from within the AVD and it hinted to me that it must be that the network setup in the AVD is not able to access my hosts file and apparently it’s because the address is used internally by Linux. A workaround is to use 10.0.2.2 if you are using Linux or your local WAN/LAN address if you are on Windows (192.168.1.x).