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annotate src/org/eclipse/jetty/server/handler/GzipHandler.java @ 867:4f5547d29192

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 02 Oct 2016 21:06:18 -0600
parents 8e9db0bbf4f9
children 4de7f6e9c453
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.server.handler;
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20
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21 import java.io.IOException;
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22 import java.io.OutputStream;
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23 import java.io.OutputStreamWriter;
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24 import java.io.PrintWriter;
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25 import java.io.UnsupportedEncodingException;
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26 import java.util.HashSet;
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27 import java.util.Set;
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28 import java.util.StringTokenizer;
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29 import java.util.zip.DeflaterOutputStream;
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30 import java.util.zip.GZIPOutputStream;
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31
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32 import javax.servlet.ServletException;
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33 import javax.servlet.http.HttpServletRequest;
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34 import javax.servlet.http.HttpServletResponse;
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35
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36 import org.eclipse.jetty.continuation.Continuation;
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37 import org.eclipse.jetty.continuation.ContinuationListener;
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38 import org.eclipse.jetty.continuation.ContinuationSupport;
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39 import org.eclipse.jetty.http.HttpMethods;
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40 import org.eclipse.jetty.http.gzip.CompressedResponseWrapper;
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41 import org.eclipse.jetty.http.gzip.AbstractCompressedStream;
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42 import org.eclipse.jetty.server.Request;
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43 import org.slf4j.Logger;
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44 import org.slf4j.LoggerFactory;
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45
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46 /* ------------------------------------------------------------ */
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47 /**
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48 * GZIP Handler This handler will gzip the content of a response if:
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49 * <ul>
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50 * <li>The filter is mapped to a matching path</li>
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51 * <li>The response status code is >=200 and <300
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52 * <li>The content length is unknown or more than the <code>minGzipSize</code> initParameter or the minGzipSize is 0(default)</li>
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53 * <li>The content-type is in the comma separated list of mimeTypes set in the <code>mimeTypes</code> initParameter or if no mimeTypes are defined the
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54 * content-type is not "application/gzip"</li>
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55 * <li>No content-encoding is specified by the resource</li>
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56 * </ul>
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57 *
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58 * <p>
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59 * Compressing the content can greatly improve the network bandwidth usage, but at a cost of memory and CPU cycles. If this handler is used for static content,
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60 * then use of efficient direct NIO may be prevented, thus use of the gzip mechanism of the <code>org.eclipse.jetty.servlet.DefaultServlet</code> is advised instead.
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61 * </p>
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62 */
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63 public class GzipHandler extends HandlerWrapper
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64 {
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65 private static final Logger LOG = LoggerFactory.getLogger(GzipHandler.class);
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66
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67 protected Set<String> _mimeTypes;
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68 protected Set<String> _excluded;
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69 protected int _bufferSize = 8192;
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70 protected int _minGzipSize = 256;
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71 protected String _vary = "Accept-Encoding, User-Agent";
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72
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73 /* ------------------------------------------------------------ */
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74 /**
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75 * Instantiates a new gzip handler.
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76 */
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77 public GzipHandler()
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78 {
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79 }
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80
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81 /* ------------------------------------------------------------ */
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82 /**
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83 * Get the mime types.
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84 *
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85 * @return mime types to set
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86 */
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87 public Set<String> getMimeTypes()
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88 {
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89 return _mimeTypes;
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90 }
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91
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92 /* ------------------------------------------------------------ */
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93 /**
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94 * Set the mime types.
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95 *
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96 * @param mimeTypes
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97 * the mime types to set
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98 */
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99 public void setMimeTypes(Set<String> mimeTypes)
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100 {
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101 _mimeTypes = mimeTypes;
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102 }
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103
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104 /* ------------------------------------------------------------ */
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105 /**
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106 * Set the mime types.
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107 *
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108 * @param mimeTypes
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109 * the mime types to set
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110 */
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111 public void setMimeTypes(String mimeTypes)
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112 {
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113 if (mimeTypes != null)
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114 {
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115 _mimeTypes = new HashSet<String>();
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116 StringTokenizer tok = new StringTokenizer(mimeTypes,",",false);
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117 while (tok.hasMoreTokens())
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118 {
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119 _mimeTypes.add(tok.nextToken());
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120 }
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121 }
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122 }
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123
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124 /* ------------------------------------------------------------ */
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125 /**
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126 * Get the excluded user agents.
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127 *
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128 * @return excluded user agents
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129 */
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130 public Set<String> getExcluded()
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131 {
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132 return _excluded;
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133 }
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134
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135 /* ------------------------------------------------------------ */
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136 /**
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137 * Set the excluded user agents.
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138 *
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139 * @param excluded
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140 * excluded user agents to set
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141 */
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142 public void setExcluded(Set<String> excluded)
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143 {
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144 _excluded = excluded;
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145 }
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146
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147 /* ------------------------------------------------------------ */
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148 /**
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149 * Set the excluded user agents.
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150 *
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151 * @param excluded
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152 * excluded user agents to set
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153 */
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154 public void setExcluded(String excluded)
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155 {
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156 if (excluded != null)
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157 {
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158 _excluded = new HashSet<String>();
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159 StringTokenizer tok = new StringTokenizer(excluded,",",false);
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160 while (tok.hasMoreTokens())
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161 _excluded.add(tok.nextToken());
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162 }
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163 }
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164
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165 /* ------------------------------------------------------------ */
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166 /**
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167 * @return The value of the Vary header set if a response can be compressed.
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168 */
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169 public String getVary()
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170 {
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171 return _vary;
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172 }
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173
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174 /* ------------------------------------------------------------ */
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175 /**
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176 * Set the value of the Vary header sent with responses that could be compressed.
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177 * <p>
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178 * By default it is set to 'Accept-Encoding, User-Agent' since IE6 is excluded by
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179 * default from the excludedAgents. If user-agents are not to be excluded, then
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180 * this can be set to 'Accept-Encoding'. Note also that shared caches may cache
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181 * many copies of a resource that is varied by User-Agent - one per variation of the
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182 * User-Agent, unless the cache does some normalization of the UA string.
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183 * @param vary The value of the Vary header set if a response can be compressed.
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184 */
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185 public void setVary(String vary)
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186 {
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187 _vary = vary;
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188 }
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189
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190 /* ------------------------------------------------------------ */
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191 /**
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192 * Get the buffer size.
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193 *
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194 * @return the buffer size
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195 */
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196 public int getBufferSize()
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197 {
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198 return _bufferSize;
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199 }
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200
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201 /* ------------------------------------------------------------ */
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202 /**
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203 * Set the buffer size.
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204 *
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205 * @param bufferSize
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206 * buffer size to set
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207 */
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208 public void setBufferSize(int bufferSize)
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209 {
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210 _bufferSize = bufferSize;
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211 }
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212
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213 /* ------------------------------------------------------------ */
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214 /**
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215 * Get the minimum reponse size.
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216 *
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217 * @return minimum reponse size
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218 */
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219 public int getMinGzipSize()
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220 {
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221 return _minGzipSize;
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222 }
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223
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224 /* ------------------------------------------------------------ */
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225 /**
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226 * Set the minimum reponse size.
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227 *
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228 * @param minGzipSize
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229 * minimum reponse size
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230 */
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231 public void setMinGzipSize(int minGzipSize)
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232 {
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233 _minGzipSize = minGzipSize;
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234 }
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235
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236 /* ------------------------------------------------------------ */
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237 /**
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238 * @see org.eclipse.jetty.server.handler.HandlerWrapper#handle(java.lang.String, org.eclipse.jetty.server.Request, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
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239 */
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240 @Override
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241 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
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242 {
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243 if (_handler!=null && isStarted())
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244 {
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245 String ae = request.getHeader("accept-encoding");
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246 if (ae != null && ae.indexOf("gzip")>=0 && !response.containsHeader("Content-Encoding")
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247 && !HttpMethods.HEAD.equalsIgnoreCase(request.getMethod()))
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248 {
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249 if (_excluded!=null)
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250 {
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251 String ua = request.getHeader("User-Agent");
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252 if (_excluded.contains(ua))
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253 {
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254 _handler.handle(target,baseRequest, request, response);
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255 return;
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256 }
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257 }
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258
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259 final CompressedResponseWrapper wrappedResponse = newGzipResponseWrapper(request,response);
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260
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261 boolean exceptional=true;
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262 try
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263 {
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264 _handler.handle(target, baseRequest, request, wrappedResponse);
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265 exceptional=false;
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266 }
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267 finally
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268 {
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269 Continuation continuation = ContinuationSupport.getContinuation(request);
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270 if (continuation.isSuspended() && continuation.isResponseWrapped())
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271 {
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272 continuation.addContinuationListener(new ContinuationListener()
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273 {
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274 public void onComplete(Continuation continuation)
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275 {
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276 try
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277 {
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278 wrappedResponse.finish();
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279 }
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280 catch(IOException e)
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281 {
820
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282 LOG.warn("",e);
802
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283 }
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284 }
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285
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286 public void onTimeout(Continuation continuation)
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287 {}
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288 });
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289 }
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290 else if (exceptional && !response.isCommitted())
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291 {
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292 wrappedResponse.resetBuffer();
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293 wrappedResponse.noCompression();
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294 }
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295 else
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296 wrappedResponse.finish();
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297 }
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298 }
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299 else
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300 {
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301 _handler.handle(target,baseRequest, request, response);
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302 }
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303 }
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304 }
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305
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306 /**
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307 * Allows derived implementations to replace ResponseWrapper implementation.
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308 *
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309 * @param request the request
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310 * @param response the response
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311 * @return the gzip response wrapper
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312 */
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313 protected CompressedResponseWrapper newGzipResponseWrapper(HttpServletRequest request, HttpServletResponse response)
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314 {
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315 return new CompressedResponseWrapper(request,response)
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316 {
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317 {
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318 super.setMimeTypes(GzipHandler.this._mimeTypes);
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319 super.setBufferSize(GzipHandler.this._bufferSize);
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320 super.setMinCompressSize(GzipHandler.this._minGzipSize);
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321 }
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322
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323 @Override
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324 protected AbstractCompressedStream newCompressedStream(HttpServletRequest request,HttpServletResponse response) throws IOException
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325 {
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326 return new AbstractCompressedStream("gzip",request,this,_vary)
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327 {
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328 @Override
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329 protected DeflaterOutputStream createStream() throws IOException
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330 {
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331 return new GZIPOutputStream(_response.getOutputStream(),_bufferSize);
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332 }
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333 };
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334 }
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335
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336 @Override
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337 protected PrintWriter newWriter(OutputStream out,String encoding) throws UnsupportedEncodingException
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338 {
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339 return GzipHandler.this.newWriter(out,encoding);
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340 }
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341 };
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342 }
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343
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344 /**
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345 * Allows derived implementations to replace PrintWriter implementation.
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346 *
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347 * @param out the out
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348 * @param encoding the encoding
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349 * @return the prints the writer
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350 * @throws UnsupportedEncodingException
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351 */
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352 protected PrintWriter newWriter(OutputStream out,String encoding) throws UnsupportedEncodingException
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353 {
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354 return encoding==null?new PrintWriter(out):new PrintWriter(new OutputStreamWriter(out,encoding));
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355 }
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356 }