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annotate src/org/eclipse/jetty/server/handler/GzipHandler.java @ 949:e9088af3787f

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author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 11 Oct 2016 23:18:13 -0600
parents 0541b6034003
children 32d4b569567c
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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.http.HttpMethods;
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37 import org.eclipse.jetty.http.gzip.CompressedResponseWrapper;
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38 import org.eclipse.jetty.http.gzip.AbstractCompressedStream;
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39 import org.eclipse.jetty.server.Request;
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40 import org.slf4j.Logger;
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41 import org.slf4j.LoggerFactory;
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42
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43 /* ------------------------------------------------------------ */
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44 /**
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45 * GZIP Handler This handler will gzip the content of a response if:
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46 * <ul>
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47 * <li>The filter is mapped to a matching path</li>
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48 * <li>The response status code is >=200 and <300
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49 * <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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50 * <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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51 * content-type is not "application/gzip"</li>
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52 * <li>No content-encoding is specified by the resource</li>
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53 * </ul>
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54 *
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55 * <p>
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56 * 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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57 * 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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58 * </p>
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59 */
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60 public class GzipHandler extends HandlerWrapper
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61 {
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62 private static final Logger LOG = LoggerFactory.getLogger(GzipHandler.class);
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63
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64 protected Set<String> _mimeTypes;
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65 protected Set<String> _excluded;
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66 protected int _bufferSize = 8192;
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67 protected int _minGzipSize = 256;
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68 protected String _vary = "Accept-Encoding, User-Agent";
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69
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70 /* ------------------------------------------------------------ */
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71 /**
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72 * Instantiates a new gzip handler.
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73 */
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74 public GzipHandler()
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75 {
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76 }
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77
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78 /* ------------------------------------------------------------ */
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79 /**
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80 * Get the mime types.
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81 *
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82 * @return mime types to set
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83 */
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84 public Set<String> getMimeTypes()
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85 {
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86 return _mimeTypes;
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87 }
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88
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89 /* ------------------------------------------------------------ */
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90 /**
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91 * Set the mime types.
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92 *
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93 * @param mimeTypes
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94 * the mime types to set
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95 */
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96 public void setMimeTypes(Set<String> mimeTypes)
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97 {
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98 _mimeTypes = mimeTypes;
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99 }
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100
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101 /* ------------------------------------------------------------ */
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102 /**
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103 * Set the mime types.
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104 *
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105 * @param mimeTypes
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106 * the mime types to set
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107 */
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108 public void setMimeTypes(String mimeTypes)
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109 {
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110 if (mimeTypes != null)
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111 {
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112 _mimeTypes = new HashSet<String>();
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113 StringTokenizer tok = new StringTokenizer(mimeTypes,",",false);
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114 while (tok.hasMoreTokens())
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115 {
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116 _mimeTypes.add(tok.nextToken());
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117 }
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118 }
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119 }
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120
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121 /* ------------------------------------------------------------ */
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122 /**
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123 * Get the excluded user agents.
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124 *
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125 * @return excluded user agents
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126 */
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127 public Set<String> getExcluded()
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128 {
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129 return _excluded;
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130 }
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131
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132 /* ------------------------------------------------------------ */
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133 /**
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134 * Set the excluded user agents.
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135 *
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136 * @param excluded
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137 * excluded user agents to set
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138 */
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139 public void setExcluded(Set<String> excluded)
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140 {
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141 _excluded = excluded;
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142 }
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143
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144 /* ------------------------------------------------------------ */
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145 /**
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146 * Set the excluded user agents.
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147 *
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148 * @param excluded
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149 * excluded user agents to set
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150 */
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151 public void setExcluded(String excluded)
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152 {
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153 if (excluded != null)
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154 {
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155 _excluded = new HashSet<String>();
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156 StringTokenizer tok = new StringTokenizer(excluded,",",false);
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157 while (tok.hasMoreTokens())
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158 _excluded.add(tok.nextToken());
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159 }
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160 }
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161
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162 /* ------------------------------------------------------------ */
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163 /**
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164 * @return The value of the Vary header set if a response can be compressed.
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165 */
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166 public String getVary()
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167 {
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168 return _vary;
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169 }
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170
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171 /* ------------------------------------------------------------ */
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172 /**
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173 * Set the value of the Vary header sent with responses that could be compressed.
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174 * <p>
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175 * By default it is set to 'Accept-Encoding, User-Agent' since IE6 is excluded by
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176 * default from the excludedAgents. If user-agents are not to be excluded, then
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177 * this can be set to 'Accept-Encoding'. Note also that shared caches may cache
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178 * many copies of a resource that is varied by User-Agent - one per variation of the
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179 * User-Agent, unless the cache does some normalization of the UA string.
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180 * @param vary The value of the Vary header set if a response can be compressed.
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181 */
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182 public void setVary(String vary)
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183 {
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184 _vary = vary;
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185 }
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186
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187 /* ------------------------------------------------------------ */
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188 /**
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189 * Get the buffer size.
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190 *
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191 * @return the buffer size
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192 */
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193 public int getBufferSize()
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194 {
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195 return _bufferSize;
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196 }
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197
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198 /* ------------------------------------------------------------ */
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199 /**
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200 * Set the buffer size.
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201 *
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202 * @param bufferSize
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203 * buffer size to set
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204 */
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205 public void setBufferSize(int bufferSize)
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206 {
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207 _bufferSize = bufferSize;
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208 }
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209
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210 /* ------------------------------------------------------------ */
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211 /**
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212 * Get the minimum reponse size.
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213 *
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214 * @return minimum reponse size
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215 */
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216 public int getMinGzipSize()
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217 {
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218 return _minGzipSize;
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219 }
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220
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221 /* ------------------------------------------------------------ */
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222 /**
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223 * Set the minimum reponse size.
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224 *
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225 * @param minGzipSize
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226 * minimum reponse size
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227 */
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228 public void setMinGzipSize(int minGzipSize)
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229 {
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230 _minGzipSize = minGzipSize;
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231 }
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232
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233 /* ------------------------------------------------------------ */
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234 /**
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235 * @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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236 */
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237 @Override
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238 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
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239 {
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240 if (_handler!=null && isStarted())
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241 {
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242 String ae = request.getHeader("accept-encoding");
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243 if (ae != null && ae.indexOf("gzip")>=0 && !response.containsHeader("Content-Encoding")
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244 && !HttpMethods.HEAD.equalsIgnoreCase(request.getMethod()))
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245 {
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246 if (_excluded!=null)
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247 {
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248 String ua = request.getHeader("User-Agent");
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249 if (_excluded.contains(ua))
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250 {
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251 _handler.handle(target,baseRequest, request, response);
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252 return;
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253 }
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254 }
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255
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256 final CompressedResponseWrapper wrappedResponse = newGzipResponseWrapper(request,response);
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257
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258 boolean exceptional=true;
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259 try
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260 {
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261 _handler.handle(target, baseRequest, request, wrappedResponse);
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262 exceptional=false;
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263 }
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264 finally
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265 {
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266 if (exceptional && !response.isCommitted())
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267 {
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268 wrappedResponse.resetBuffer();
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269 wrappedResponse.noCompression();
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270 }
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271 else
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272 wrappedResponse.finish();
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273 }
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274 }
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275 else
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276 {
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277 _handler.handle(target,baseRequest, request, response);
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278 }
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279 }
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280 }
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281
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282 /**
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283 * Allows derived implementations to replace ResponseWrapper implementation.
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284 *
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285 * @param request the request
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286 * @param response the response
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287 * @return the gzip response wrapper
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288 */
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289 protected CompressedResponseWrapper newGzipResponseWrapper(HttpServletRequest request, HttpServletResponse response)
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290 {
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291 return new CompressedResponseWrapper(request,response)
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292 {
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293 {
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294 super.setMimeTypes(GzipHandler.this._mimeTypes);
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295 super.setBufferSize(GzipHandler.this._bufferSize);
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296 super.setMinCompressSize(GzipHandler.this._minGzipSize);
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297 }
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298
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299 @Override
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300 protected AbstractCompressedStream newCompressedStream(HttpServletRequest request,HttpServletResponse response) throws IOException
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301 {
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302 return new AbstractCompressedStream("gzip",request,this,_vary)
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303 {
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304 @Override
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305 protected DeflaterOutputStream createStream() throws IOException
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306 {
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307 return new GZIPOutputStream(_response.getOutputStream(),_bufferSize);
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308 }
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309 };
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310 }
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311
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312 @Override
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313 protected PrintWriter newWriter(OutputStream out,String encoding) throws UnsupportedEncodingException
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314 {
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315 return GzipHandler.this.newWriter(out,encoding);
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316 }
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317 };
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318 }
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319
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320 /**
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321 * Allows derived implementations to replace PrintWriter implementation.
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322 *
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323 * @param out the out
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324 * @param encoding the encoding
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325 * @return the prints the writer
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326 * @throws UnsupportedEncodingException
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327 */
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328 protected PrintWriter newWriter(OutputStream out,String encoding) throws UnsupportedEncodingException
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329 {
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330 return encoding==null?new PrintWriter(out):new PrintWriter(new OutputStreamWriter(out,encoding));
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331 }
802
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332 }