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    * Licensed to the Apache Software Foundation (ASF) under one
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    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
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   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
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   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
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  package org.apache.http.impl.client;
  
  import java.net.URI;
  import java.util.List;
  
  import org.apache.http.HttpEntity;
  import org.apache.http.HttpEntityEnclosingRequest;
  import org.apache.http.HttpHost;
  import org.apache.http.HttpResponse;
  import org.apache.http.HttpStatus;
  import org.apache.http.HttpVersion;
  import org.apache.http.ProtocolException;
  import org.apache.http.client.config.RequestConfig;
  import org.apache.http.client.methods.HttpDelete;
  import org.apache.http.client.methods.HttpGet;
  import org.apache.http.client.methods.HttpHead;
  import org.apache.http.client.methods.HttpPost;
  import org.apache.http.client.methods.HttpPut;
  import org.apache.http.client.methods.HttpTrace;
  import org.apache.http.client.methods.HttpUriRequest;
  import org.apache.http.client.protocol.HttpClientContext;
  import org.apache.http.entity.BasicHttpEntity;
  import org.apache.http.message.BasicHttpResponse;
  import org.apache.http.protocol.BasicHttpContext;
  import org.apache.http.protocol.HttpContext;
  import org.apache.http.protocol.HttpCoreContext;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class TestDefaultRedirectStrategy {
  
      @Test
      public void testIsRedirectable() {
          final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
          Assert.assertTrue(redirectStrategy.isRedirectable(HttpGet.METHOD_NAME));
          Assert.assertTrue(redirectStrategy.isRedirectable(HttpHead.METHOD_NAME));
          Assert.assertFalse(redirectStrategy.isRedirectable(HttpPut.METHOD_NAME));
          Assert.assertFalse(redirectStrategy.isRedirectable(HttpPost.METHOD_NAME));
          Assert.assertFalse(redirectStrategy.isRedirectable(HttpDelete.METHOD_NAME));
      }
  
      @Test
      public void testIsRedirectedMovedTemporary() throws Exception {
          final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
          final HttpClientContext context = HttpClientContext.create();
          final HttpGet httpget = new HttpGet("http://localhost/");
          final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                  HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
          response.addHeader("Location", "http://localhost/stuff");
          Assert.assertTrue(redirectStrategy.isRedirected(httpget, response, context));
          final HttpPost httppost = new HttpPost("http://localhost/");
          Assert.assertFalse(redirectStrategy.isRedirected(httppost, response, context));
      }
  
      @Test
      public void testIsRedirectedMovedTemporaryNoLocation() throws Exception {
          final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
          final HttpClientContext context = HttpClientContext.create();
          final HttpGet httpget = new HttpGet("http://localhost/");
          final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                  HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
          Assert.assertFalse(redirectStrategy.isRedirected(httpget, response, context));
      }
  
      @Test
      public void testIsRedirectedMovedPermanently() throws Exception {
          final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
          final HttpClientContext context = HttpClientContext.create();
          final HttpGet httpget = new HttpGet("http://localhost/");
          final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                  HttpStatus.SC_MOVED_PERMANENTLY, "Redirect");
          Assert.assertTrue(redirectStrategy.isRedirected(httpget, response, context));
          final HttpPost httppost = new HttpPost("http://localhost/");
         Assert.assertFalse(redirectStrategy.isRedirected(httppost, response, context));
     }
 
     @Test
     public void testIsRedirectedTemporaryRedirect() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_TEMPORARY_REDIRECT, "Redirect");
         Assert.assertTrue(redirectStrategy.isRedirected(httpget, response, context));
         final HttpPost httppost = new HttpPost("http://localhost/");
         Assert.assertFalse(redirectStrategy.isRedirected(httppost, response, context));
     }
 
     @Test
     public void testIsRedirectedPermanentRedirect() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 DefaultRedirectStrategy.SC_PERMANENT_REDIRECT, "Redirect");
         Assert.assertTrue(redirectStrategy.isRedirected(httpget, response, context));
         final HttpPost httppost = new HttpPost("http://localhost/");
         Assert.assertFalse(redirectStrategy.isRedirected(httppost, response, context));
     }
 
     @Test
     public void testIsRedirectedSeeOther() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_SEE_OTHER, "Redirect");
         Assert.assertTrue(redirectStrategy.isRedirected(httpget, response, context));
         final HttpPost httppost = new HttpPost("http://localhost/");
         Assert.assertTrue(redirectStrategy.isRedirected(httppost, response, context));
     }
 
     @Test
     public void testIsRedirectedUnknownStatus() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1, 333, "Redirect");
         Assert.assertFalse(redirectStrategy.isRedirected(httpget, response, context));
         final HttpPost httppost = new HttpPost("http://localhost/");
         Assert.assertFalse(redirectStrategy.isRedirected(httppost, response, context));
     }
 
     @Test
     public void testIsRedirectedInvalidInput() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_SEE_OTHER, "Redirect");
         try {
             redirectStrategy.isRedirected(null, response, context);
             Assert.fail("IllegalArgumentException expected");
         } catch (final IllegalArgumentException expected) {
         }
         try {
             redirectStrategy.isRedirected(httpget, null, context);
             Assert.fail("IllegalArgumentException expected");
         } catch (final IllegalArgumentException expected) {
         }
     }
 
     @Test
     public void testGetLocationUri() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response.addHeader("Location", "http://localhost/stuff");
         final URI uri = redirectStrategy.getLocationURI(httpget, response, context);
         Assert.assertEquals(URI.create("http://localhost/stuff"), uri);
     }
 
     @Test(expected=ProtocolException.class)
     public void testGetLocationUriMissingHeader() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         redirectStrategy.getLocationURI(httpget, response, context);
     }
 
     @Test(expected=ProtocolException.class)
     public void testGetLocationUriInvalidLocation() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response.addHeader("Location", "http://localhost/not valid");
         redirectStrategy.getLocationURI(httpget, response, context);
     }
 
     @Test
     public void testGetLocationUriRelative() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         context.setAttribute(HttpCoreContext.HTTP_TARGET_HOST, new HttpHost("localhost"));
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response.addHeader("Location", "/stuff");
         final URI uri = redirectStrategy.getLocationURI(httpget, response, context);
         Assert.assertEquals(URI.create("http://localhost/stuff"), uri);
     }
 
     @Test(expected=IllegalStateException.class)
     public void testGetLocationUriRelativeMissingTargetHost() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response.addHeader("Location", "/stuff");
         final URI uri = redirectStrategy.getLocationURI(httpget, response, context);
         Assert.assertEquals(URI.create("http://localhost/stuff"), uri);
     }
 
     @Test
     public void testGetLocationUriRelativeWithFragment() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         context.setAttribute(HttpCoreContext.HTTP_TARGET_HOST, new HttpHost("localhost"));
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response.addHeader("Location", "/stuff#fragment");
         final URI uri = redirectStrategy.getLocationURI(httpget, response, context);
         Assert.assertEquals(URI.create("http://localhost/stuff#fragment"), uri);
     }
 
     @Test
     public void testGetLocationUriAbsoluteWithFragment() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         context.setAttribute(HttpCoreContext.HTTP_TARGET_HOST, new HttpHost("localhost"));
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response.addHeader("Location", "http://localhost/stuff#fragment");
         final URI uri = redirectStrategy.getLocationURI(httpget, response, context);
         Assert.assertEquals(URI.create("http://localhost/stuff#fragment"), uri);
     }
 
     @Test
     public void testGetLocationUriNormalized() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         context.setAttribute(HttpCoreContext.HTTP_TARGET_HOST, new HttpHost("localhost"));
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response.addHeader("Location", "http://localhost/././stuff/../morestuff");
         final URI uri = redirectStrategy.getLocationURI(httpget, response, context);
         Assert.assertEquals(URI.create("http://localhost/morestuff"), uri);
     }
 
     @Test(expected=ProtocolException.class)
     public void testGetLocationUriRelativeLocationNotAllowed() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         context.setAttribute(HttpCoreContext.HTTP_TARGET_HOST, new HttpHost("localhost"));
         final RequestConfig config = RequestConfig.custom().setRelativeRedirectsAllowed(false).build();
         context.setRequestConfig(config);
 
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response.addHeader("Location", "/stuff");
         redirectStrategy.getLocationURI(httpget, response, context);
     }
 
     @Test
     public void testGetLocationUriAllowCircularRedirects() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         context.setAttribute(HttpCoreContext.HTTP_TARGET_HOST, new HttpHost("localhost"));
         final RequestConfig config = RequestConfig.custom().setCircularRedirectsAllowed(true).build();
         context.setRequestConfig(config);
         final URI uri1 = URI.create("http://localhost/stuff1");
         final URI uri2 = URI.create("http://localhost/stuff2");
         final URI uri3 = URI.create("http://localhost/stuff3");
         final HttpGet httpget1 = new HttpGet("http://localhost/");
         final HttpResponse response1 = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response1.addHeader("Location", uri1.toASCIIString());
         final HttpGet httpget2 = new HttpGet(uri1.toASCIIString());
         final HttpResponse response2 = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response2.addHeader("Location", uri2.toASCIIString());
         final HttpGet httpget3 = new HttpGet(uri2.toASCIIString());
         final HttpResponse response3 = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response3.addHeader("Location", uri3.toASCIIString());
         Assert.assertEquals(uri1, redirectStrategy.getLocationURI(httpget1, response1, context));
         Assert.assertEquals(uri2, redirectStrategy.getLocationURI(httpget2, response2, context));
         Assert.assertEquals(uri3, redirectStrategy.getLocationURI(httpget3, response3, context));
 
         final List<URI> uris = context.getRedirectLocations();
         Assert.assertNotNull(uris);
         Assert.assertTrue(uris.contains(uri1));
         Assert.assertTrue(uris.contains(uri2));
         Assert.assertTrue(uris.contains(uri3));
         Assert.assertEquals(3, uris.size());
         Assert.assertEquals(uri1, uris.get(0));
         Assert.assertEquals(uri2, uris.get(1));
         Assert.assertEquals(uri3, uris.get(2));
     }
 
     @Test(expected=ProtocolException.class)
     public void testGetLocationUriDisallowCircularRedirects() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         context.setAttribute(HttpCoreContext.HTTP_TARGET_HOST, new HttpHost("localhost"));
         final HttpGet httpget = new HttpGet("http://localhost/stuff");
         final RequestConfig config = RequestConfig.custom().setCircularRedirectsAllowed(false).build();
         context.setRequestConfig(config);
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response.addHeader("Location", "http://localhost/stuff");
         final URI uri = URI.create("http://localhost/stuff");
         Assert.assertEquals(uri, redirectStrategy.getLocationURI(httpget, response, context));
         redirectStrategy.getLocationURI(httpget, response, context);
     }
 
     @Test
     public void testGetLocationUriInvalidInput() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpClientContext context = HttpClientContext.create();
         final HttpGet httpget = new HttpGet("http://localhost/");
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_MOVED_TEMPORARILY, "Redirect");
         response.addHeader("Location", "http://localhost/stuff");
         try {
             redirectStrategy.getLocationURI(null, response, context);
             Assert.fail("IllegalArgumentException expected");
         } catch (final IllegalArgumentException expected) {
         }
         try {
             redirectStrategy.getLocationURI(httpget, null, context);
             Assert.fail("IllegalArgumentException expected");
         } catch (final IllegalArgumentException expected) {
         }
         try {
             redirectStrategy.getLocationURI(httpget, response, null);
             Assert.fail("IllegalArgumentException expected");
         } catch (final IllegalArgumentException expected) {
         }
     }
 
     @Test
     public void testGetRedirectRequest() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_SEE_OTHER, "Redirect");
         response.addHeader("Location", "http://localhost/stuff");
         final HttpContext context1 = new BasicHttpContext();
         final HttpUriRequest redirect1 = redirectStrategy.getRedirect(
                 new HttpGet("http://localhost/"), response, context1);
         Assert.assertEquals("GET", redirect1.getMethod());
         final HttpContext context2 = new BasicHttpContext();
         final HttpUriRequest redirect2 = redirectStrategy.getRedirect(
                 new HttpPost("http://localhost/"), response, context2);
         Assert.assertEquals("GET", redirect2.getMethod());
         final HttpContext context3 = new BasicHttpContext();
         final HttpUriRequest redirect3 = redirectStrategy.getRedirect(
                 new HttpHead("http://localhost/"), response, context3);
         Assert.assertEquals("HEAD", redirect3.getMethod());
     }
 
     @Test
     public void testGetRedirectRequestForTemporaryRedirect() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 HttpStatus.SC_TEMPORARY_REDIRECT, "Temporary Redirect");
         response.addHeader("Location", "http://localhost/stuff");
         final HttpContext context1 = new BasicHttpContext();
         final HttpUriRequest redirect1 = redirectStrategy.getRedirect(
                 new HttpTrace("http://localhost/"), response, context1);
         Assert.assertEquals("TRACE", redirect1.getMethod());
         final HttpContext context2 = new BasicHttpContext();
         final HttpPost httppost = new HttpPost("http://localhost/");
         final HttpEntity entity = new BasicHttpEntity();
         httppost.setEntity(entity);
         final HttpUriRequest redirect2 = redirectStrategy.getRedirect(
                 httppost, response, context2);
         Assert.assertEquals("POST", redirect2.getMethod());
         Assert.assertTrue(redirect2 instanceof HttpEntityEnclosingRequest);
         Assert.assertSame(entity, ((HttpEntityEnclosingRequest) redirect2).getEntity());
     }
 
     @Test
     public void testGetRedirectRequestForPermanentRedirect() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
                 DefaultRedirectStrategy.SC_PERMANENT_REDIRECT, "Permanent Redirect");
         response.addHeader("Location", "http://localhost/stuff");
         final HttpContext context1 = new BasicHttpContext();
         final HttpUriRequest redirect1 = redirectStrategy.getRedirect(
                 new HttpTrace("http://localhost/"), response, context1);
         Assert.assertEquals("TRACE", redirect1.getMethod());
         final HttpContext context2 = new BasicHttpContext();
         final HttpPost httppost = new HttpPost("http://localhost/");
         final HttpEntity entity = new BasicHttpEntity();
         httppost.setEntity(entity);
         final HttpUriRequest redirect2 = redirectStrategy.getRedirect(
                 httppost, response, context2);
         Assert.assertEquals("POST", redirect2.getMethod());
         Assert.assertTrue(redirect2 instanceof HttpEntityEnclosingRequest);
         Assert.assertSame(entity, ((HttpEntityEnclosingRequest) redirect2).getEntity());
     }
 
     @Test(expected=ProtocolException.class)
     public void testCreateLocationURIInvalid() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         redirectStrategy.createLocationURI(":::::::");
     }
 
     @Test
     public void testWithoutNormalize() throws Exception {
         final DefaultRedirectStrategy redirectStrategy = new DefaultRedirectStrategy();
         final HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
             HttpStatus.SC_TEMPORARY_REDIRECT, "Temporary Redirect");
         response.addHeader("Location", "http://somewhere.com//foo");
         final HttpClientContext context1 = new HttpClientContext(new BasicHttpContext());
         context1.setRequestConfig(RequestConfig.custom().setNormalizeUri(false).build());
         Assert.assertEquals("http://somewhere.com//foo", redirectStrategy.getRedirect(
             new HttpGet("http://localhost/stuff"), response, context1).getURI().toASCIIString());
     }
 }