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<pre><span class="source-line-no">001</span><span id="line-1">/*</span>
<span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span>
<span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span>
<span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span>
<span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span>
<span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span>
<span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span>
<span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span>
<span class="source-line-no">009</span><span id="line-9"> *</span>
<span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="source-line-no">011</span><span id="line-11"> *</span>
<span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span>
<span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span>
<span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span>
<span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span>
<span class="source-line-no">017</span><span id="line-17"> */</span>
<span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.http;</span>
<span class="source-line-no">019</span><span id="line-19"></span>
<span class="source-line-no">020</span><span id="line-20">import static org.junit.Assert.assertNotNull;</span>
<span class="source-line-no">021</span><span id="line-21">import static org.junit.Assert.fail;</span>
<span class="source-line-no">022</span><span id="line-22"></span>
<span class="source-line-no">023</span><span id="line-23">import java.io.BufferedReader;</span>
<span class="source-line-no">024</span><span id="line-24">import java.io.File;</span>
<span class="source-line-no">025</span><span id="line-25">import java.io.IOException;</span>
<span class="source-line-no">026</span><span id="line-26">import java.io.InputStream;</span>
<span class="source-line-no">027</span><span id="line-27">import java.io.InputStreamReader;</span>
<span class="source-line-no">028</span><span id="line-28">import java.net.MalformedURLException;</span>
<span class="source-line-no">029</span><span id="line-29">import java.net.ServerSocket;</span>
<span class="source-line-no">030</span><span id="line-30">import java.net.URI;</span>
<span class="source-line-no">031</span><span id="line-31">import java.net.URL;</span>
<span class="source-line-no">032</span><span id="line-32">import java.net.URLConnection;</span>
<span class="source-line-no">033</span><span id="line-33">import java.nio.charset.StandardCharsets;</span>
<span class="source-line-no">034</span><span id="line-34">import org.apache.hadoop.conf.Configuration;</span>
<span class="source-line-no">035</span><span id="line-35">import org.apache.hadoop.net.NetUtils;</span>
<span class="source-line-no">036</span><span id="line-36">import org.apache.hadoop.security.authorize.AccessControlList;</span>
<span class="source-line-no">037</span><span id="line-37">import org.slf4j.Logger;</span>
<span class="source-line-no">038</span><span id="line-38">import org.slf4j.LoggerFactory;</span>
<span class="source-line-no">039</span><span id="line-39"></span>
<span class="source-line-no">040</span><span id="line-40">/**</span>
<span class="source-line-no">041</span><span id="line-41"> * This is a base class for functional tests of the {@link HttpServer}. The methods are static for</span>
<span class="source-line-no">042</span><span id="line-42"> * other classes to import statically.</span>
<span class="source-line-no">043</span><span id="line-43"> */</span>
<span class="source-line-no">044</span><span id="line-44">public class HttpServerFunctionalTest {</span>
<span class="source-line-no">045</span><span id="line-45"> private static final Logger LOG = LoggerFactory.getLogger(HttpServerFunctionalTest.class);</span>
<span class="source-line-no">046</span><span id="line-46"> /** JVM property for the webapp test dir : {@value} */</span>
<span class="source-line-no">047</span><span id="line-47"> public static final String TEST_BUILD_WEBAPPS = "test.build.webapps";</span>
<span class="source-line-no">048</span><span id="line-48"> /** expected location of the test.build.webapps dir: {@value} */</span>
<span class="source-line-no">049</span><span id="line-49"> private static final String BUILD_WEBAPPS_DIR = "src/test/resources/webapps";</span>
<span class="source-line-no">050</span><span id="line-50"></span>
<span class="source-line-no">051</span><span id="line-51"> /** name of the test webapp: {@value} */</span>
<span class="source-line-no">052</span><span id="line-52"> private static final String TEST = "test";</span>
<span class="source-line-no">053</span><span id="line-53"></span>
<span class="source-line-no">054</span><span id="line-54"> /**</span>
<span class="source-line-no">055</span><span id="line-55"> * Create but do not start the test webapp server. The test webapp dir is prepared/checked in</span>
<span class="source-line-no">056</span><span id="line-56"> * advance.</span>
<span class="source-line-no">057</span><span id="line-57"> * @return the server instance</span>
<span class="source-line-no">058</span><span id="line-58"> * @throws IOException if a problem occurs</span>
<span class="source-line-no">059</span><span id="line-59"> * @throws AssertionError if a condition was not met</span>
<span class="source-line-no">060</span><span id="line-60"> */</span>
<span class="source-line-no">061</span><span id="line-61"> public static HttpServer createTestServer() throws IOException {</span>
<span class="source-line-no">062</span><span id="line-62"> prepareTestWebapp();</span>
<span class="source-line-no">063</span><span id="line-63"> return createServer(TEST);</span>
<span class="source-line-no">064</span><span id="line-64"> }</span>
<span class="source-line-no">065</span><span id="line-65"></span>
<span class="source-line-no">066</span><span id="line-66"> /**</span>
<span class="source-line-no">067</span><span id="line-67"> * Create but do not start the test webapp server. The test webapp dir is prepared/checked in</span>
<span class="source-line-no">068</span><span id="line-68"> * advance.</span>
<span class="source-line-no">069</span><span id="line-69"> * @param conf the server configuration to use</span>
<span class="source-line-no">070</span><span id="line-70"> * @return the server instance</span>
<span class="source-line-no">071</span><span id="line-71"> * @throws IOException if a problem occurs</span>
<span class="source-line-no">072</span><span id="line-72"> * @throws AssertionError if a condition was not met</span>
<span class="source-line-no">073</span><span id="line-73"> */</span>
<span class="source-line-no">074</span><span id="line-74"> public static HttpServer createTestServer(Configuration conf) throws IOException {</span>
<span class="source-line-no">075</span><span id="line-75"> prepareTestWebapp();</span>
<span class="source-line-no">076</span><span id="line-76"> return createServer(TEST, conf);</span>
<span class="source-line-no">077</span><span id="line-77"> }</span>
<span class="source-line-no">078</span><span id="line-78"></span>
<span class="source-line-no">079</span><span id="line-79"> public static HttpServer createTestServer(Configuration conf, AccessControlList adminsAcl)</span>
<span class="source-line-no">080</span><span id="line-80"> throws IOException {</span>
<span class="source-line-no">081</span><span id="line-81"> prepareTestWebapp();</span>
<span class="source-line-no">082</span><span id="line-82"> return createServer(TEST, conf, adminsAcl);</span>
<span class="source-line-no">083</span><span id="line-83"> }</span>
<span class="source-line-no">084</span><span id="line-84"></span>
<span class="source-line-no">085</span><span id="line-85"> /**</span>
<span class="source-line-no">086</span><span id="line-86"> * Create but do not start the test webapp server. The test webapp dir is prepared/checked in</span>
<span class="source-line-no">087</span><span id="line-87"> * advance.</span>
<span class="source-line-no">088</span><span id="line-88"> * @param conf the server configuration to use</span>
<span class="source-line-no">089</span><span id="line-89"> * @return the server instance</span>
<span class="source-line-no">090</span><span id="line-90"> * @throws IOException if a problem occurs</span>
<span class="source-line-no">091</span><span id="line-91"> * @throws AssertionError if a condition was not met</span>
<span class="source-line-no">092</span><span id="line-92"> */</span>
<span class="source-line-no">093</span><span id="line-93"> public static HttpServer createTestServer(Configuration conf, String[] pathSpecs)</span>
<span class="source-line-no">094</span><span id="line-94"> throws IOException {</span>
<span class="source-line-no">095</span><span id="line-95"> prepareTestWebapp();</span>
<span class="source-line-no">096</span><span id="line-96"> return createServer(TEST, conf, pathSpecs);</span>
<span class="source-line-no">097</span><span id="line-97"> }</span>
<span class="source-line-no">098</span><span id="line-98"></span>
<span class="source-line-no">099</span><span id="line-99"> public static HttpServer createTestServerWithSecurity(Configuration conf) throws IOException {</span>
<span class="source-line-no">100</span><span id="line-100"> prepareTestWebapp();</span>
<span class="source-line-no">101</span><span id="line-101"> return localServerBuilder(TEST).setFindPort(true).setConf(conf).setSecurityEnabled(true)</span>
<span class="source-line-no">102</span><span id="line-102"> // InfoServer normally sets these for us</span>
<span class="source-line-no">103</span><span id="line-103"> .setUsernameConfKey(HttpServer.HTTP_SPNEGO_AUTHENTICATION_PRINCIPAL_KEY)</span>
<span class="source-line-no">104</span><span id="line-104"> .setKeytabConfKey(HttpServer.HTTP_SPNEGO_AUTHENTICATION_KEYTAB_KEY).build();</span>
<span class="source-line-no">105</span><span id="line-105"> }</span>
<span class="source-line-no">106</span><span id="line-106"></span>
<span class="source-line-no">107</span><span id="line-107"> public static HttpServer createTestServerWithSecurityAndAcl(Configuration conf,</span>
<span class="source-line-no">108</span><span id="line-108"> AccessControlList acl) throws IOException {</span>
<span class="source-line-no">109</span><span id="line-109"> prepareTestWebapp();</span>
<span class="source-line-no">110</span><span id="line-110"> return localServerBuilder(TEST).setFindPort(true).setConf(conf).setSecurityEnabled(true)</span>
<span class="source-line-no">111</span><span id="line-111"> // InfoServer normally sets these for us</span>
<span class="source-line-no">112</span><span id="line-112"> .setUsernameConfKey(HttpServer.HTTP_SPNEGO_AUTHENTICATION_PRINCIPAL_KEY)</span>
<span class="source-line-no">113</span><span id="line-113"> .setKeytabConfKey(HttpServer.HTTP_SPNEGO_AUTHENTICATION_KEYTAB_KEY).setSecurityEnabled(true)</span>
<span class="source-line-no">114</span><span id="line-114"> .setACL(acl).build();</span>
<span class="source-line-no">115</span><span id="line-115"> }</span>
<span class="source-line-no">116</span><span id="line-116"></span>
<span class="source-line-no">117</span><span id="line-117"> /**</span>
<span class="source-line-no">118</span><span id="line-118"> * Prepare the test webapp by creating the directory from the test properties fail if the</span>
<span class="source-line-no">119</span><span id="line-119"> * directory cannot be created.</span>
<span class="source-line-no">120</span><span id="line-120"> * @throws IOException if an error occurred</span>
<span class="source-line-no">121</span><span id="line-121"> * @throws AssertionError if a condition was not met</span>
<span class="source-line-no">122</span><span id="line-122"> */</span>
<span class="source-line-no">123</span><span id="line-123"> protected static void prepareTestWebapp() throws IOException {</span>
<span class="source-line-no">124</span><span id="line-124"> String webapps = System.getProperty(TEST_BUILD_WEBAPPS, BUILD_WEBAPPS_DIR);</span>
<span class="source-line-no">125</span><span id="line-125"> File testWebappDir = new File(webapps + File.separatorChar + TEST);</span>
<span class="source-line-no">126</span><span id="line-126"> if (!testWebappDir.exists()) {</span>
<span class="source-line-no">127</span><span id="line-127"> fail("Test webapp dir " + testWebappDir.getCanonicalPath() + " missing");</span>
<span class="source-line-no">128</span><span id="line-128"> }</span>
<span class="source-line-no">129</span><span id="line-129"> }</span>
<span class="source-line-no">130</span><span id="line-130"></span>
<span class="source-line-no">131</span><span id="line-131"> /**</span>
<span class="source-line-no">132</span><span id="line-132"> * Create an HttpServer instance on the given address for the given webapp</span>
<span class="source-line-no">133</span><span id="line-133"> * @param host to bind</span>
<span class="source-line-no">134</span><span id="line-134"> * @param port to bind</span>
<span class="source-line-no">135</span><span id="line-135"> * @return the server</span>
<span class="source-line-no">136</span><span id="line-136"> * @throws IOException if it could not be created</span>
<span class="source-line-no">137</span><span id="line-137"> */</span>
<span class="source-line-no">138</span><span id="line-138"> public static HttpServer createServer(String host, int port) throws IOException {</span>
<span class="source-line-no">139</span><span id="line-139"> prepareTestWebapp();</span>
<span class="source-line-no">140</span><span id="line-140"> return new HttpServer.Builder().setName(TEST)</span>
<span class="source-line-no">141</span><span id="line-141"> .addEndpoint(URI.create("http://" + host + ":" + port)).setFindPort(true).build();</span>
<span class="source-line-no">142</span><span id="line-142"> }</span>
<span class="source-line-no">143</span><span id="line-143"></span>
<span class="source-line-no">144</span><span id="line-144"> /**</span>
<span class="source-line-no">145</span><span id="line-145"> * Create an HttpServer instance for the given webapp</span>
<span class="source-line-no">146</span><span id="line-146"> * @param webapp the webapp to work with</span>
<span class="source-line-no">147</span><span id="line-147"> * @return the server</span>
<span class="source-line-no">148</span><span id="line-148"> * @throws IOException if it could not be created</span>
<span class="source-line-no">149</span><span id="line-149"> */</span>
<span class="source-line-no">150</span><span id="line-150"> public static HttpServer createServer(String webapp) throws IOException {</span>
<span class="source-line-no">151</span><span id="line-151"> return localServerBuilder(webapp).setFindPort(true).build();</span>
<span class="source-line-no">152</span><span id="line-152"> }</span>
<span class="source-line-no">153</span><span id="line-153"></span>
<span class="source-line-no">154</span><span id="line-154"> /**</span>
<span class="source-line-no">155</span><span id="line-155"> * Create an HttpServer instance for the given webapp</span>
<span class="source-line-no">156</span><span id="line-156"> * @param webapp the webapp to work with</span>
<span class="source-line-no">157</span><span id="line-157"> * @param conf the configuration to use for the server</span>
<span class="source-line-no">158</span><span id="line-158"> * @return the server</span>
<span class="source-line-no">159</span><span id="line-159"> * @throws IOException if it could not be created</span>
<span class="source-line-no">160</span><span id="line-160"> */</span>
<span class="source-line-no">161</span><span id="line-161"> public static HttpServer createServer(String webapp, Configuration conf) throws IOException {</span>
<span class="source-line-no">162</span><span id="line-162"> return localServerBuilder(webapp).setFindPort(true).setConf(conf).build();</span>
<span class="source-line-no">163</span><span id="line-163"> }</span>
<span class="source-line-no">164</span><span id="line-164"></span>
<span class="source-line-no">165</span><span id="line-165"> public static HttpServer createServer(String webapp, Configuration conf,</span>
<span class="source-line-no">166</span><span id="line-166"> AccessControlList adminsAcl) throws IOException {</span>
<span class="source-line-no">167</span><span id="line-167"> return localServerBuilder(webapp).setFindPort(true).setConf(conf).setACL(adminsAcl).build();</span>
<span class="source-line-no">168</span><span id="line-168"> }</span>
<span class="source-line-no">169</span><span id="line-169"></span>
<span class="source-line-no">170</span><span id="line-170"> private static HttpServer.Builder localServerBuilder(String webapp) {</span>
<span class="source-line-no">171</span><span id="line-171"> return new HttpServer.Builder().setName(webapp).addEndpoint(URI.create("http://localhost:0"));</span>
<span class="source-line-no">172</span><span id="line-172"> }</span>
<span class="source-line-no">173</span><span id="line-173"></span>
<span class="source-line-no">174</span><span id="line-174"> /**</span>
<span class="source-line-no">175</span><span id="line-175"> * Create an HttpServer instance for the given webapp</span>
<span class="source-line-no">176</span><span id="line-176"> * @param webapp the webapp to work with</span>
<span class="source-line-no">177</span><span id="line-177"> * @param conf the configuration to use for the server</span>
<span class="source-line-no">178</span><span id="line-178"> * @param pathSpecs the paths specifications the server will service</span>
<span class="source-line-no">179</span><span id="line-179"> * @return the server</span>
<span class="source-line-no">180</span><span id="line-180"> * @throws IOException if it could not be created</span>
<span class="source-line-no">181</span><span id="line-181"> */</span>
<span class="source-line-no">182</span><span id="line-182"> public static HttpServer createServer(String webapp, Configuration conf, String[] pathSpecs)</span>
<span class="source-line-no">183</span><span id="line-183"> throws IOException {</span>
<span class="source-line-no">184</span><span id="line-184"> return localServerBuilder(webapp).setFindPort(true).setConf(conf).setPathSpec(pathSpecs)</span>
<span class="source-line-no">185</span><span id="line-185"> .build();</span>
<span class="source-line-no">186</span><span id="line-186"> }</span>
<span class="source-line-no">187</span><span id="line-187"></span>
<span class="source-line-no">188</span><span id="line-188"> /**</span>
<span class="source-line-no">189</span><span id="line-189"> * Create and start a server with the test webapp</span>
<span class="source-line-no">190</span><span id="line-190"> * @return the newly started server</span>
<span class="source-line-no">191</span><span id="line-191"> * @throws IOException on any failure</span>
<span class="source-line-no">192</span><span id="line-192"> * @throws AssertionError if a condition was not met</span>
<span class="source-line-no">193</span><span id="line-193"> */</span>
<span class="source-line-no">194</span><span id="line-194"> public static HttpServer createAndStartTestServer() throws IOException {</span>
<span class="source-line-no">195</span><span id="line-195"> HttpServer server = createTestServer();</span>
<span class="source-line-no">196</span><span id="line-196"> server.start();</span>
<span class="source-line-no">197</span><span id="line-197"> return server;</span>
<span class="source-line-no">198</span><span id="line-198"> }</span>
<span class="source-line-no">199</span><span id="line-199"></span>
<span class="source-line-no">200</span><span id="line-200"> /**</span>
<span class="source-line-no">201</span><span id="line-201"> * If the server is non null, stop it</span>
<span class="source-line-no">202</span><span id="line-202"> * @param server to stop</span>
<span class="source-line-no">203</span><span id="line-203"> * @throws Exception on any failure</span>
<span class="source-line-no">204</span><span id="line-204"> */</span>
<span class="source-line-no">205</span><span id="line-205"> public static void stop(HttpServer server) throws Exception {</span>
<span class="source-line-no">206</span><span id="line-206"> if (server != null) {</span>
<span class="source-line-no">207</span><span id="line-207"> server.stop();</span>
<span class="source-line-no">208</span><span id="line-208"> }</span>
<span class="source-line-no">209</span><span id="line-209"> }</span>
<span class="source-line-no">210</span><span id="line-210"></span>
<span class="source-line-no">211</span><span id="line-211"> /**</span>
<span class="source-line-no">212</span><span id="line-212"> * Pass in a server, return a URL bound to localhost and its port</span>
<span class="source-line-no">213</span><span id="line-213"> * @param server server</span>
<span class="source-line-no">214</span><span id="line-214"> * @return a URL bonded to the base of the server</span>
<span class="source-line-no">215</span><span id="line-215"> * @throws MalformedURLException if the URL cannot be created.</span>
<span class="source-line-no">216</span><span id="line-216"> */</span>
<span class="source-line-no">217</span><span id="line-217"> public static URL getServerURL(HttpServer server) throws MalformedURLException {</span>
<span class="source-line-no">218</span><span id="line-218"> assertNotNull("No server", server);</span>
<span class="source-line-no">219</span><span id="line-219"> return new URL("http://" + NetUtils.getHostPortString(server.getConnectorAddress(0)));</span>
<span class="source-line-no">220</span><span id="line-220"> }</span>
<span class="source-line-no">221</span><span id="line-221"></span>
<span class="source-line-no">222</span><span id="line-222"> /**</span>
<span class="source-line-no">223</span><span id="line-223"> * Read in the content from a URL</span>
<span class="source-line-no">224</span><span id="line-224"> * @param url URL To read</span>
<span class="source-line-no">225</span><span id="line-225"> * @return the text from the output</span>
<span class="source-line-no">226</span><span id="line-226"> * @throws IOException if something went wrong</span>
<span class="source-line-no">227</span><span id="line-227"> */</span>
<span class="source-line-no">228</span><span id="line-228"> protected static String readOutput(URL url) throws IOException {</span>
<span class="source-line-no">229</span><span id="line-229"> StringBuilder out = new StringBuilder();</span>
<span class="source-line-no">230</span><span id="line-230"> InputStream in = url.openConnection().getInputStream();</span>
<span class="source-line-no">231</span><span id="line-231"> byte[] buffer = new byte[64 * 1024];</span>
<span class="source-line-no">232</span><span id="line-232"> int len = in.read(buffer);</span>
<span class="source-line-no">233</span><span id="line-233"> while (len &gt; 0) {</span>
<span class="source-line-no">234</span><span id="line-234"> out.append(new String(buffer, 0, len, StandardCharsets.UTF_8));</span>
<span class="source-line-no">235</span><span id="line-235"> len = in.read(buffer);</span>
<span class="source-line-no">236</span><span id="line-236"> }</span>
<span class="source-line-no">237</span><span id="line-237"> return out.toString();</span>
<span class="source-line-no">238</span><span id="line-238"> }</span>
<span class="source-line-no">239</span><span id="line-239"></span>
<span class="source-line-no">240</span><span id="line-240"> /**</span>
<span class="source-line-no">241</span><span id="line-241"> * Recursively deletes a {@link File}.</span>
<span class="source-line-no">242</span><span id="line-242"> */</span>
<span class="source-line-no">243</span><span id="line-243"> protected static void deleteRecursively(File d) {</span>
<span class="source-line-no">244</span><span id="line-244"> if (d.isDirectory()) {</span>
<span class="source-line-no">245</span><span id="line-245"> for (String name : d.list()) {</span>
<span class="source-line-no">246</span><span id="line-246"> File child = new File(d, name);</span>
<span class="source-line-no">247</span><span id="line-247"> if (child.isFile()) {</span>
<span class="source-line-no">248</span><span id="line-248"> child.delete();</span>
<span class="source-line-no">249</span><span id="line-249"> } else {</span>
<span class="source-line-no">250</span><span id="line-250"> deleteRecursively(child);</span>
<span class="source-line-no">251</span><span id="line-251"> }</span>
<span class="source-line-no">252</span><span id="line-252"> }</span>
<span class="source-line-no">253</span><span id="line-253"> }</span>
<span class="source-line-no">254</span><span id="line-254"> d.delete();</span>
<span class="source-line-no">255</span><span id="line-255"> }</span>
<span class="source-line-no">256</span><span id="line-256"></span>
<span class="source-line-no">257</span><span id="line-257"> /**</span>
<span class="source-line-no">258</span><span id="line-258"> * Picks a free port on the host by binding a Socket to '0'.</span>
<span class="source-line-no">259</span><span id="line-259"> */</span>
<span class="source-line-no">260</span><span id="line-260"> protected static int getFreePort() throws IOException {</span>
<span class="source-line-no">261</span><span id="line-261"> ServerSocket s = new ServerSocket(0);</span>
<span class="source-line-no">262</span><span id="line-262"> try {</span>
<span class="source-line-no">263</span><span id="line-263"> s.setReuseAddress(true);</span>
<span class="source-line-no">264</span><span id="line-264"> int port = s.getLocalPort();</span>
<span class="source-line-no">265</span><span id="line-265"> return port;</span>
<span class="source-line-no">266</span><span id="line-266"> } finally {</span>
<span class="source-line-no">267</span><span id="line-267"> if (null != s) {</span>
<span class="source-line-no">268</span><span id="line-268"> s.close();</span>
<span class="source-line-no">269</span><span id="line-269"> }</span>
<span class="source-line-no">270</span><span id="line-270"> }</span>
<span class="source-line-no">271</span><span id="line-271"> }</span>
<span class="source-line-no">272</span><span id="line-272"></span>
<span class="source-line-no">273</span><span id="line-273"> /**</span>
<span class="source-line-no">274</span><span id="line-274"> * access a url, ignoring some IOException such as the page does not exist</span>
<span class="source-line-no">275</span><span id="line-275"> */</span>
<span class="source-line-no">276</span><span id="line-276"> public static void access(String urlstring) throws IOException {</span>
<span class="source-line-no">277</span><span id="line-277"> URL url = new URL(urlstring);</span>
<span class="source-line-no">278</span><span id="line-278"></span>
<span class="source-line-no">279</span><span id="line-279"> URLConnection connection = url.openConnection();</span>
<span class="source-line-no">280</span><span id="line-280"> connection.connect();</span>
<span class="source-line-no">281</span><span id="line-281"></span>
<span class="source-line-no">282</span><span id="line-282"> try (BufferedReader in = new BufferedReader(</span>
<span class="source-line-no">283</span><span id="line-283"> new InputStreamReader(connection.getInputStream(), StandardCharsets.UTF_8))) {</span>
<span class="source-line-no">284</span><span id="line-284"> for (; in.readLine() != null;) {</span>
<span class="source-line-no">285</span><span id="line-285"> continue;</span>
<span class="source-line-no">286</span><span id="line-286"> }</span>
<span class="source-line-no">287</span><span id="line-287"> } catch (IOException ioe) {</span>
<span class="source-line-no">288</span><span id="line-288"> LOG.info("Got exception: ", ioe);</span>
<span class="source-line-no">289</span><span id="line-289"> }</span>
<span class="source-line-no">290</span><span id="line-290"> }</span>
<span class="source-line-no">291</span><span id="line-291"></span>
<span class="source-line-no">292</span><span id="line-292">}</span>
</pre>
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