Re: Getting at the Location URI header value in the ClientParamStacks

[Oleg Kalnichevski <ol...@apache.org>]

On Wed, 2008-10-01 at 08:26 -0700, mars_man wrote:
> Basically, my java client will be sending an HTTPS request to an ASP site;
> that site gets the request, does what it needs to do and then redirects back
> using a returnURL that is part of the initial HTTPS request. They then tack
> on the result message to the return URL. For example: if the https request
> is https://xyz.com/add.asp?name=sav&returnURL=http://mysite.com.   The
> return URL from the xyz.com site is http://mysite.com?resultCode=success.
> 
> All I want to do is follow the redirection and get at that resultCode value
> and I had this working with httpclients 3.0 but since i could not get the
> SSL handshale working, i decided to look in to the HttpClients 4.0. I have
> the SSL handshake issue resolved but can't figure out how to get at that
> resultCode namevalue pair. I see the returnURI in the Location header field
> in the ClientParamStacks in the Wire logs but I can't figure out how to get
> at that field. I have tried looking at the request, response and the
> httpentity objects (header values and other objects) but can't find it
> there.....
> 
> My code is:
> DefaultHttpClient httpclient = new DefaultHttpClient();      
> HttpHost proxy =
>             new HttpHost(config.getProperty("proxy"),
>                 new Integer(config.getProperty("port")).intValue(),
>                 "http");
>         httpclient.getParams().setParameter(
>             ConnRoutePNames.DEFAULT_PROXY, proxy);
> 
>         httpclient.getParams().setBooleanParameter(
>            ClientPNames.HANDLE_REDIRECTS, true);
> 
>         //read the emisare keystore
>         KeyStore trustStore =
> KeyStore.getInstance(KeyStore.getDefaultType());
>         trustStore.load(ReadFileUtil.getStream("/myKeystore.jks"),
>             "changeit".toCharArray());
>       
>         //set up an SSLSicketFactory
>         SSLSocketFactory socketFactory = new SSLSocketFactory(trustStore);
>         Scheme sch = new Scheme("https", socketFactory, 443);
>         httpclient.getConnectionManager().getSchemeRegistry().register(sch);
> 
>         HttpGet httpget = new HttpGet(emisareURL);
>         System.out.println("executing request" + httpget.getRequestLine());
> 
>         HttpResponse response = httpclient.execute(httpget);
>         HttpEntity entity = response.getEntity();
> 
>         httpclient.getParams();
>       
>         Header[] headers = response.getAllHeaders();
>         for (int i = 0; i < headers.length; i++)
>         {
>             System.out.println(headers[i].getName() + " : " +
>                 headers[i].getValue());
>         }
> 
> ---------------------------
> the older code that i had working with http clients 3.01 is
> 
>        HttpClient client = new HttpClient();
>         GetMethod method = new GetMethod();
>         try
>         {
>             method.setURI(new URI(myURL, false));
> 
>             method.setFollowRedirects(true);
> 
>             //make the call
>             HostConfiguration hostConfig = new HostConfiguration();
>             hostConfig.setProxy(config.getProperty("proxy"),
>                 new Integer(config.getProperty("port")).intValue());
> 
>             hostConfig.setHost(targethost, sslPort, myhttps);
> 
>             client.setHostConfiguration(hostConfig);
> 
>             int statusCode = client.executeMethod(method);
> 
>             if
>  ((statusCode != HttpStatus.SC_OK))
>             {
>                 throw new MyServiceException(
>                     config.getProperty("SERVICE_ERROR_MSG"));
>             }
>             else
>             {
>                 String returnedQueryString =
>                     URLDecoder.decode(
>                                 method.getQueryString(),
>                                 "UTF-8").replaceAll("%20", " ");
> 
>                 logger.logDebug("returnedQueryString = " +
> returnedQueryString);
> 
>                 int totalLen = returnedQueryString.length();
>                 int resultIndex = returnedQueryString.indexOf("result");
>                 returnMsg = returnedQueryString.substring(
>                             resultIndex + RESULT_LENGTH, totalLen).
>                             replaceAll(" ", "_");
>                 logger.logDebug("emisareMsg = " + returnMsg);
> 
>               
>  logger.logDebug(config.getProperty(returnMsg.trim()));
>                 returnMsg = config.getProperty(returnMsg.trim());
>             }
> ---------------
> The return code from the external site ended up in the querystring attribute
> of the method object and i could parse it to get what i needed.
> 
> Like I mentioned I could not get the SSL working using 3.0 (with my
> implementation of SecureSocketProtocolFactory) till I switched to 4.0 but in
> 4.0, I can't figure out how to get at the return URI.
> 
> I am porting over an ASP app to Java and in the previous world, this https
> communication was ASP page to ASP page but in the
> new enrvironment it is going to be java client to ASP page. Whatever the ASP
> returns back to us, we are not going to display it anywhere; we just need to
> get
> at the name-value parameter of the return URL.
> 
> Any help in getting this going using httpclient 4.0 will be greatly
> appreaciated.
> 
> Thanks in advance.

Sorry for responding so late. I just came back from vacation. 

There are two ways of obtaining the redirect location with HttpClient
4.0

(1) by providing a custom redirect handler

(2) by getting hold of the executed request object from the execution
context  

----
DefaultHttpClient  httpclient = new DefaultHttpClient(params);

httpclient.setRedirectHandler(new DefaultRedirectHandler() {

    @Override
    public URI getLocationURI(
            HttpResponse response, 
            HttpContext context) throws ProtocolException {
        URI location = super.getLocationURI(response, context);
        System.out.println(location); // method 1
        return location;
    }
    
});

HttpContext context = new BasicHttpContext();
HttpGet httpget = new HttpGet("http://localhost:8080");

HttpResponse response = httpclient.execute(httpget, context);

HttpUriRequest request = (HttpUriRequest)
context.getAttribute(ExecutionContext.HTTP_REQUEST);
System.out.println(request.getURI()); // method 2

---

Hope this helps

Oleg


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