@Test
  public void testEcho() throws Exception {
    assertEquals("a:b\nc:d\n", readOutput(new URL(baseUrl, "/echo?a=b&c=d")));
    assertEquals("a:b\nc&lt;:d\ne:&gt;\n", readOutput(new URL(baseUrl, "/echo?a=b&c<=d&e=>")));
  }
Test the maximum number of threads cannot be exceeded.
hbase-http/src/test/java/org/apache/hadoop/hbase/http/TestHttpServer.java