How to overwrite http-header “Host” in a HttpURLConnection?

问题

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.

回答1:

Duplicate question.

The last comment solved my problem:

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

Or at VM startup:

-Dsun.net.http.allowRestrictedHeaders=true

来源：https://stackoverflow.com/questions/9096987/how-to-overwrite-http-header-host-in-a-httpurlconnection