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javanetwork-programminghttpurlconnection
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Reputation: 7890

HttpURLConnection & Using A Specific Network Adapter

I'd like to use the Java class HttpURLConnection to connect to a particular device on a (local network). I have need to use a specific network adapter because the machine that will be running my program has 2 network adapters installed. One adapter is on a wider company network and is dynamically assigned an IP whilst the second is a network local to the machine and has a static IP. It is this second local network to which I want to restrict my program to.

Using HttpURLConnection is convenient because it relieves me of having to parse the server response etc and get straight at the data I need instead of doing something like this. However because I need to restrict my HTTP requests to a specific network adapter I can't be 100% sure that my HTTP requests are sent ONLY via the desired adapter. Am I correct in my understanding of how HttpURLConnection works i.e. it relies on the operating system to select the appropriate network adapter to use?

Upvotes: 7

Views: 3339

Answers (1)

Oleg Mikheev
Oleg Mikheev

Reputation: 17444

With plain Java you will only be able to bind a Socket to a selected NetworkInterface.

If you need HTTP protocol support with ability to control which network interface to connect from you'll need to use Apache HTTP Client.

You'll need to provide a ConnRoutePNames.LOCAL_ADDRESS parameter to it, see details here: http://hc.apache.org/httpcomponents-client-ga/tutorial/html/connmgmt.html.

UPDATE:

Since 4.3 ConnRoutePNames is deprecated, please use RequestConfig and its RequestConfig.Builder instead.

Upvotes: 8

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