public static void fetchURL()

in src/main/java/org/apache/maven/plugin/doap/DoapUtil.java [469:528]
44 lines of code
11 McCabe index (conditional complexity)

    public static void fetchURL(Settings settings, URL url) throws IOException {
        if (url == null) {
            throw new IllegalArgumentException("The url is null");
        }

        if ("file".equals(url.getProtocol())) {
            // [ERROR] src/main/java/org/apache/maven/plugin/doap/DoapUtil.java:[474,53] (blocks) EmptyBlock: Empty try
            // block.
            // Test if file exists
            try (InputStream in = url.openStream()) {}
            return;
        }

        // http, https...
        HttpClient httpClient = new HttpClient(new MultiThreadedHttpConnectionManager());
        httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(DEFAULT_TIMEOUT);
        httpClient.getHttpConnectionManager().getParams().setSoTimeout(DEFAULT_TIMEOUT);
        httpClient.getParams().setBooleanParameter(HttpClientParams.ALLOW_CIRCULAR_REDIRECTS, true);

        // Some web servers don't allow the default user-agent sent by httpClient
        httpClient
                .getParams()
                .setParameter(HttpMethodParams.USER_AGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)");

        if (settings != null && settings.getActiveProxy() != null) {
            Proxy activeProxy = settings.getActiveProxy();

            ProxyInfo proxyInfo = new ProxyInfo();
            proxyInfo.setNonProxyHosts(activeProxy.getNonProxyHosts());

            if (StringUtils.isNotEmpty(activeProxy.getHost())
                    && !ProxyUtils.validateNonProxyHosts(proxyInfo, url.getHost())) {
                httpClient.getHostConfiguration().setProxy(activeProxy.getHost(), activeProxy.getPort());

                if (StringUtils.isNotEmpty(activeProxy.getUsername()) && activeProxy.getPassword() != null) {
                    Credentials credentials =
                            new UsernamePasswordCredentials(activeProxy.getUsername(), activeProxy.getPassword());

                    httpClient.getState().setProxyCredentials(AuthScope.ANY, credentials);
                }
            }
        }

        GetMethod getMethod = new GetMethod(url.toString());
        try {
            int status;
            try {
                status = httpClient.executeMethod(getMethod);
            } catch (SocketTimeoutException e) {
                // could be a sporadic failure, one more retry before we give up
                status = httpClient.executeMethod(getMethod);
            }

            if (status != HttpStatus.SC_OK) {
                throw new FileNotFoundException(url.toString());
            }
        } finally {
            getMethod.releaseConnection();
        }
    }