I'm experiencing a problem with the response code (and body) returned after HttpClient tries to execute a (get) method on an unknown host. If the host had previously been in DNS and returned a valid (200, eg) response code, subsequent attempts to execute still return that same code and body, although the host is actually unavailable. All instances of the client object will continue to return the same 200 response until the servlet container has been restarted; after the restart, the client does throw the expected unknown host exception.
Teresa,
This sounds like DNS caching to me. By "unavailable" you mean the host has no DNS entry but is still up and running under the same IP as when it was "available"?
The java.net.InetAddress class does DNS caching. Prior to JDK 1.4 there is no way to clear the DNS cache, you need to set some System properties to limit the DNS cache time. From 1.4 on these limits have better default values.
For 1.3 I usually set the System Properties sun.net.inetaddr.ttl sun.net.inetaddr.negative.ttl to a value of 5 each.
HTH
Odi
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