How to overwrite http-header "Host" in a HttpURLConnection?

Question

My code is like the following:

URL url = new URL("1.0.0.25/otfg/services");
HttpURLConnection cnx = url.openConnection();
cnx.setRequestProperty("Host", "example.org");

But when I log the outgoing packages with tcpdump the http-header "Host" is 1.0.0.25.

Could it be that the http-header "Host" is overwritten at a later stage of the sending process, if yes how can I avoid this behavior.

I use iptables to alter the source ip address of the outgoing packages, iptables use the fake ip address 1.0.0.25 to find packages which must be altered. The remote service need's the correct domain name for doing a name based virtual hosting service. — Alex, Feb 01 '12 at 14:28
Duplicate of http://stackoverflow.com/questions/7648872/can-i-override-the-host-header-where-using-javas-httpurlconnection-class — Gray, Feb 01 '12 at 15:01
Possible duplicate of [Can I override the Host header where using java's HttpUrlConnection class?](http://stackoverflow.com/questions/7648872/can-i-override-the-host-header-where-using-javas-httpurlconnection-class) — albciff, Mar 28 '17 at 07:58

score 28 · Accepted Answer · edited May 23 '17 at 11:47

28

The last comment solved my problem:

System.setProperty("sun.net.http.allowRestrictedHeaders", "true")

Or at VM startup:

-Dsun.net.http.allowRestrictedHeaders=true

edited May 23 '17 at 11:47

Community

answered Feb 01 '12 at 15:24

Alex

1 Answers1