How to get the error code for http request

I have to implement the if..elso loop depending on the error code return as below.
String host="127.0.0.2"
if the this servers is not found or itis down it should return error code, based on that I have to change the host value to some other server like "127.0.0.4" , Can you let me know how it can be implemented? Please help me.

Here is my requirement...
say.. if client hit " http:\\ 172.0.0.3: 1000/index.jsp" and if the server 172.0.0.3 is not available i will set the server host to some other and request will redirect accoringly like " http:\\ 172.0.0.4: 1000/index.jsp"

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How to get the error code for http request

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