Hi Ryan,

> the fourth  method trigger a Exception: host parameter is null. 

Please post a stack trace of this exception. Without that,
we can only guess where you are seeing the problem.

> the first three are work properly, only the fourth got a exception.Below is 
> the PostData function
> public String PostData(String url, NameValuePair[] data) {
>       PostMethod post = new PostMethod(url);

What value has 'url' here? Is it an absolute URL?

cheers,
  Roland


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