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POJava HttpClient seems to be caching content
 

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  1. POJava HttpClient seems to be caching content
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    <p>I'm building a simple web-scraper and i need to fetch the same page a few hundred times, and there's an attribute in the page that is dynamic and should change at each request. I've built a multithreaded HttpClient based class to process the requests and i'm using an <code>ExecutorService</code> to make a thread pool and run the threads. The problem is that dynamic attribute sometimes doesn't change on each request and i end up getting the same value on like 3 or 4 subsequent threads. I've read alot about HttpClient and i really can't find where this problem comes from. Could it be something about caching, or something like it!?</p> <p>Update: here is the code executed in each thread:</p> <pre><code>HttpContext localContext = new BasicHttpContext(); HttpParams params = new BasicHttpParams(); HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1); HttpProtocolParams.setContentCharset(params, HTTP.DEFAULT_CONTENT_CHARSET); HttpProtocolParams.setUseExpectContinue(params, true); ClientConnectionManager connman = new ThreadSafeClientConnManager(); DefaultHttpClient httpclient = new DefaultHttpClient(connman, params); HttpHost proxy = new HttpHost(inc_proxy, Integer.valueOf(inc_port)); httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy); HttpGet httpGet = new HttpGet(url); httpGet.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"); String iden = null; int timeoutConnection = 10000; HttpConnectionParams.setConnectionTimeout(httpGet.getParams(), timeoutConnection); try { HttpResponse response = httpclient.execute(httpGet, localContext); HttpEntity entity = response.getEntity(); if (entity != null) { InputStream instream = entity.getContent(); String result = convertStreamToString(instream); // System.out.printf("Resultado\n %s",result +"\n"); instream.close(); iden = StringUtils .substringBetween(result, "&lt;input name=\"iden\" value=\"", "\" type=\"hidden\"/&gt;"); System.out.printf("IDEN:%s\n", iden); EntityUtils.consume(entity); } } catch (ClientProtocolException e) { // TODO Auto-generated catch block System.out.println("Excepção CP"); } catch (IOException e) { // TODO Auto-generated catch block System.out.println("Excepção IO"); } </code></pre>
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    1. COCould be cached on the server side.
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    2. COYou could be writing thread-unsafe code, and whenever you download the data the old results get overwritten by new results. It's hard to tell without code.
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    3. COi've updated the question with code
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