How to set http method parameters with RestTemplate

[SlowSnail]

Hi to everyone.

I use RestTemplate (and apach HttpClient 4) in my project and I enjoy things this template provide.

Our system has a lot of interfaces and some of services I request require to use the same local ip adrress for each request, so I store it and set property org.apache.http.conn.params.ConnRoutePNames.LOCAL_ ADDRESS every time when I execute my requests. And there's no problem if I do without RestTemplate, but I don't know how to set this parameter to request thought RestTemplate.

Actually I have some idea about it. I read RestTemplate docs and I found that I have to use RequestCallback to prepare my request before execution (requestCallback object that prepares the request).

I think about some RequestCallback implementation and it's using like that:

restTemplate.execute("http://someurl", HttpMethod.GET, new LocalIpRequestCallback("127.0.0.1"), null);
	
private final class LocalIpRequestCallback implements RequestCallback{
	    
private final String localIp2use;

        private LocalIpRequestCallback(String localIp2use) {
            this.localIp2use = localIp2use;
        }

        @Override
        public void doWithRequest(ClientHttpRequest request) throws IOException {
            if(localIp2use != null){
                if(request instanceof HttpComponentsClientHttpRequest){
                    HttpComponentsClientHttpRequest apacheRequest =  (HttpComponentsClientHttpRequest)request;                
                    apacheRequest.setParameter(ConnRoutePNames.LOCAL_ADDRESS, localIp2use);
                }                
            }
        }
	    
}

But there's some problems:
- HttpComponentsClientHttpRequest is not public;
- HttpComponentsClientHttpRequest even if it was a public it doesn't have any method for setting parameters;


Does anybody has any advices ?