Github user twogee commented on the issue:

    https://github.com/apache/ant-ivy/pull/54
  
    The code below apparently assumes that client 2.x might still be around; it 
is obsolete and this is a perfect opportunity to remove it
    
    ```
        private HttpClientHelper getHttpClientHelper() {
            if (httpClientHelper == null) {
                // use commons httpclient 3.0 if available
                try {
                    HttpMethodBase.class.getMethod("getResponseContentLength");
                    httpClientHelper = new HttpClientHelper3x();
                    Message.verbose("using commons httpclient 3.x helper");
                } catch (SecurityException e) {
                    Message.verbose("unable to get access to 
getResponseContentLength of "
                            + "commons-httpclient HeadMethod. Please use 
commons-httpclient 3.0 or "
                            + "use ivy with sufficient security permissions.");
                    Message.verbose("exception: " + e.getMessage());
                    httpClientHelper = new HttpClientHelper2x();
                    Message.verbose("using commons httpclient 2.x helper");
                } catch (NoSuchMethodException e) {
                    httpClientHelper = new HttpClientHelper2x();
                    Message.verbose("using commons httpclient 2.x helper");
                }
            }
            return httpClientHelper;
        }
    
    ```


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