docs/appengine/whyappengine.html

   1
   2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "DTD/xhtml1-transitional.dtd">
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30 <html>
  31   <head>
  32     <script type="text/javascript" language="JavaScript">
  33     ORIGINAL_PAGE_PATH = "/appengine/whyappengine.html";
  34     </script>
  35
  36
  37 <meta http-equiv="content-type" content="text/html; charset=utf-8">
  38 <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">
  39 <title>Why App Engine - Google App Engine - Google Code</title>
  40 <script type="text/javascript"><!--
  41 (function(){function a(){this.t={};this.tick=function(c){this.t[c]=(new Date).getTime()};this.tick("start")}var b=new a;window.jstiming={Timer:a,load:b};if(window.external&&window.external.pageT)window.jstiming.pt=window.external.pageT;})();
  42
  43 var _tocPath_ = '/appengine/docs/_toc.ezt';
  44 var codesite_token = null;
  45 var logged_in_user_email = null;
  46 //--></script>
  47 <link href="../css/codesite.pack.04102009.css" type="text/css" rel="stylesheet">
  48 <script src="../js/codesite_head.pack.04102009.js" type="text/javascript"></script>
  49 <script type="text/javascript">CODESITE_CSITimer['load'].tick('bhs');</script>
  50 <link rel="search" type="application/opensearchdescription+xml" title="Google Code" href="http://code.google.com/osd.xml">
  51
  52 <!--[if IE]><link rel="stylesheet" type="text/css" href="../css/iehacks.css"><![endif]-->
  53
  54     <link href="../css/semantic_headers.css" rel="stylesheet" type="text/css" />
  55     <link href="css/local_extensions.css" rel="stylesheet" type="text/css" />
  56   </head>
  57
  58   <body class="gc-documentation">
  59
  60
  61
  62     <script type="text/javascript">
  63 var _gaq = _gaq || [];
  64
  65 var cookiePath = '/appengine/';
  66 if (cookiePath.lastIndexOf('.html') > cookiePath.lastIndexOf('/')) {
  67   cookiePath = cookiePath.substring(0, cookiePath.lastIndexOf('/') + 1);
  68 };
  69
  70 _gaq.push(
  71
  72
  73     ['siteTracker._setAccount', 'UA-18071-1'],
  74     ['siteTracker._setDomainName', 'code.google.com'],
  75     ['siteTracker._trackPageview']
  76 );
  77 (function() {
  78   var ga = document.createElement('script');
  79   ga.type = 'text/javascript';
  80   ga.async = true;
  81   ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
  82   (document.getElementsByTagName('head')[0] ||
  83    document.getElementsByTagName('body')[0]).appendChild(ga);
  84  })();
  85 </script>
  86
  87
  88 <div id="gb">
  89  <span>
  90
  91     <a id="lang-dropdown" href="http://code.google.com" onclick="return false;"><span style="text-decoration:underline">English</span> <span style="font-size:.75em;">&#9660;</span></a>
  92
  93  </span>
  94 </div>
  95
  96 <div class="gbh" style="left:0px;"></div>
  97 <div class="gbh" style="right:0px;"></div>
  98
  99
 100 <div id="gc-container">
 101 <a id="top"></a>
 102 <div id="skipto">
 103   <a href="#gc-pagecontent">Skip to page content</a>
 104   <a href="#gc-toc">Skip to main navigation</a>
 105 </div>
 106
 107 <div id="gc-header">
 108   <div id="logo"><a href="http://code.google.com">
 109
 110      <img src="../images/code_logo.gif" height="40" width="167" alt="Google Code" style="border:0;margin:3px 0 0 0;">
 111
 112   </a></div>
 113   <div id="search">
 114     <div id="searchForm">
 115       <form id="cse" action="http://www.google.com/cse" accept-charset="utf-8" onsubmit="executeGSearch(document.getElementById('gsearchInput').value); return false;">
 116       <noscript>
 117       <input type="hidden" name="cref" value="http://code.google.com/cse/googlecode-context.xml">
 118       </noscript>
 119       <div id="gsc-search-box">
 120         <input id="gsearchInput" type="text" name="q" maxlength="2048" class="gsc-input" autocomplete="off" title="Google Code Search" style="width:345px">
 121         <div id="cs-searchresults" onclick="event.cancelBubble = true;"></div>
 122         <input title="Search" id="gsearchButton" class="gsc-search-button" name="sa" value="Search" type="submit">
 123         <div class="greytext">e.g. "templates" or "datastore"</div>
 124       </div>
 125       </form>
 126     </div> <!-- end searchForm -->
 127   </div> <!-- end search -->
 128
 129
 130
 131
 132 </div> <!-- end gc-header -->
 133
 134
 135 <div id="codesiteContent">
 136
 137 <a id="gc-topnav-anchor"></a>
 138 <div id="gc-topnav">
 139   <h1 style="padding:0 0 0 6px;">Google App Engine</h1>
 140   <ul id="docs" class="gc-topnav-tabs">
 141
 142     <li id="home_link">
 143       <a href="index.html" title="Google App Engine home page">Home</a>
 144     </li>
 145
 146     <li id="docs_link">
 147       <a href="docs/index.html" class="selected" title="Official Google App Engine documentation">Docs</a>
 148     </li>
 149
 150     <li id="faq_link">
 151       <a href="kb/index.html" title="Answers to frequently asked questions about Google App Engine">FAQ</a>
 152     </li>
 153
 154     <li id="articles_link">
 155       <a href="articles/index.html" title="Focused articles and tutorials for Google App Engine developers">Articles</a>
 156     </li>
 157
 158     <li>
 159       <a href="http://googleappengine.blogspot.com/" title="Official Google App Engine blog">Blog</a>
 160     </li>
 161
 162     <li>
 163       <a href="community.html" title="Community home for Google App Engine">Community</a>
 164     </li>
 165
 166     <li>
 167       <a href="terms.html" title="Google App Engine terms of service">Terms</a>
 168     </li>
 169
 170     <li>
 171       <a href="downloads.html" title="Download Google App Engine">Download</a>
 172     </li>
 173
 174
 175
 176
 177
 178
 179   <li><g:plusone size="small" count="false" source="google:googlecode"></g:plusone>&nbsp;</li>
 180 </ul>
 181 </div> <!-- end gc-topnav -->
 182
 183
 184     <div class="g-section g-tpl-170">
 185
 186       <div class="g-unit g-first" id="gc-toc">
 187         <ul>
 188   <li><a href="downloads.html">Downloads</a></li>
 189   <li><a href="tools_tips.html">Tools and Tips</a></li>
 190   <li><a href="docs/glossary.html">Glossary</a><sup class="new">New!</sup></li>
 191   <li><a href="https://appengine.google.com/">Admin Console</a></li>
 192   <li><a href="http://code.google.com/status/appengine">System Status</a></li>
 193   <li><a href="http://code.google.com/p/googleappengine/issues/list">Issue Tracker</a></li>
 194 </ul>
 195 <div class="line"></div>
 196 <ul>
 197   <li><h2>Getting Started</h2>
 198     <ul>
 199       <li><a href="docs/whatisgoogleappengine.html">What Is Google App Engine?</a></li>
 200       <li><a href="docs/java/gettingstarted/index.html">Java</a>
 201         <ul>
 202               <li><a href="docs/java/gettingstarted/introduction.html">Introduction</a></li>
 203     <li><a href="docs/java/gettingstarted/installing.html">Installing the Java SDK</a></li>
 204     <li><a href="docs/java/gettingstarted/creating.html">Creating a Project</a></li>
 205     <li><a href="docs/java/gettingstarted/usingusers.html">Using the Users Service</a></li>
 206     <li><a href="docs/java/gettingstarted/usingjsps.html">Using JSPs</a></li>
 207     <li><a href="docs/java/gettingstarted/usingdatastore.html">Using the Datastore</a></li>
 208     <li><a href="docs/java/gettingstarted/staticfiles.html">Using Static Files</a></li>
 209     <li><a href="docs/java/gettingstarted/uploading.html">Uploading Your Application</a></li>
 210     <li><a href="http://googcloudlabs.appspot.com">Codelabs for Getting Started in Java</a></li>
 211
 212         </ul>
 213       </li>
 214       <li><a href="docs/python/gettingstarted/index.html">Python 2.5</a>
 215         <ul>
 216             <li><a href="docs/python/gettingstarted/introduction.html">Introduction</a></li>
 217   <li><a href="docs/python/gettingstarted/devenvironment.html">The Development Environment</a></li>
 218   <li><a href="docs/python/gettingstarted/helloworld.html">Hello, World!</a></li>
 219   <li><a href="docs/python/gettingstarted/usingwebapp.html">Using the webapp Framework</a></li>
 220   <li><a href="docs/python/gettingstarted/usingusers.html">Using the Users Service</a></li>
 221   <li><a href="docs/python/gettingstarted/handlingforms.html">Handling Forms With webapp</a></li>
 222   <li><a href="docs/python/gettingstarted/usingdatastore.html">Using the Datastore</a></li>
 223   <li><a href="docs/python/gettingstarted/templates.html">Using Templates</a></li>
 224   <li><a href="docs/python/gettingstarted/staticfiles.html">Using Static Files</a></li>
 225   <li><a href="docs/python/gettingstarted/uploading.html">Uploading Your Application</a></li>
 226
 227         </ul>
 228       </li>
 229       <li><a href="docs/python/gettingstartedpython27/index.html">Python 2.7</a>
 230         <ul>
 231             <li><a href="docs/python/gettingstartedpython27/introduction.html">Introduction</a></li>
 232   <li><a href="docs/python/gettingstartedpython27/devenvironment.html">The Development Environment</a></li>
 233   <li><a href="docs/python/gettingstartedpython27/helloworld.html">Hello, World!</a></li>
 234   <li><a href="docs/python/gettingstartedpython27/usingwebapp.html">Explaining the webapp2 Framework</a></li>
 235   <li><a href="docs/python/gettingstartedpython27/usingusers.html">Using the Users Service</a></li>
 236   <li><a href="docs/python/gettingstartedpython27/handlingforms.html">Handling Forms With webapp</a></li>
 237   <li><a href="docs/python/gettingstartedpython27/usingdatastore.html">Using the Datastore</a></li>
 238   <li><a href="docs/python/gettingstartedpython27/templates.html">Using Templates</a></li>
 239   <li><a href="docs/python/gettingstartedpython27/staticfiles.html">Using Static Files</a></li>
 240   <li><a href="docs/python/gettingstartedpython27/uploading.html">Uploading Your Application</a></li>
 241
 242         </ul>
 243       </li>
 244       <li><a href="docs/go/gettingstarted/index.html">Go</a>
 245         <ul>
 246           <li><span class="exp-feat">Experimental!</span></li>
 247             <li><a href="docs/go/gettingstarted/introduction.html">Introduction</a></li>
 248   <li><a href="docs/go/gettingstarted/devenvironment.html">The Development Environment</a></li>
 249   <li><a href="docs/go/gettingstarted/helloworld.html">Hello, World!</a></li>
 250   <li><a href="docs/go/gettingstarted/usingusers.html">Using the Users Service</a></li>
 251   <li><a href="docs/go/gettingstarted/handlingforms.html">Handling Forms</a></li>
 252   <li><a href="docs/go/gettingstarted/usingdatastore.html">Using the Datastore</a></li>
 253   <li><a href="docs/go/gettingstarted/uploading.html">Uploading Your Application</a></li>
 254
 255         </ul>
 256       </li>
 257     </ul>
 258   </li>
 259 </ul>
 260 <div class="line"></div>
 261 <ul>
 262   <li><h2>Java</h2>
 263     <ul>
 264           <li><a href="docs/java/overview.html">Overview</a></li>
 265     <li><a href="docs/java/runtime.html">Servlet Environment</a></li>
 266     <li><a href="docs/java/backends/index.html">Backends</a>
 267       <ul>
 268         <li><a href="docs/java/backends/overview.html">Overview</a></li>
 269 <li><a href="docs/java/javadoc/com/google/appengine/api/backends/package-summary.html">Javadoc Reference</a></li>
 270
 271
 272       </ul>
 273     </li>
 274     <li><a href="docs/java/datastore/index.html">Storing Data</a>
 275       <ul>
 276             <li><a href="docs/java/datastore/overview.html">Overview</a></li>
 277     <li><a href="docs/java/datastore/entities.html">Entities</a></li>
 278     <li><a href="docs/java/datastore/queries.html">Queries</a></li>
 279     <li><a href="docs/java/datastore/transactions.html">Transactions</a></li>
 280     <li><a href="docs/java/datastore/hr/index.html">Choosing a Datastore</a></li>
 281     <li><a href="docs/java/datastore/hr/overview.html">Using the High Replication Datastore</a></li>
 282     <li><a href="docs/java/datastore/metadataqueries.html">Metadata Queries</a></li>
 283     <li><a href="docs/java/datastore/stats.html">Statistics</a></li>
 284     <li><a href="docs/java/datastore/async.html">Async API</a></li>
 285     <li><a href="docs/java/datastore/callbacks.html">Callbacks</a></li>
 286     <li><a href="docs/java/datastore/jdo/index.html">JDO</a>
 287       <ul>
 288             <li><a href="docs/java/datastore/jdo/overview.html">Overview</a></li>
 289     <li><a href="docs/java/datastore/jdo/dataclasses.html">Defining Data Classes with JDO</a></li>
 290     <li><a href="docs/java/datastore/jdo/creatinggettinganddeletingdata.html">Creating, Getting, and Deleting Data in JDO</a></li>
 291     <li><a href="docs/java/datastore/jdo/relationships.html">Entity Relationships in JDO</a></li>
 292     <li><a href="docs/java/datastore/jdo/queries.html">Queries in JDO</a></li>
 293
 294       </ul>
 295     </li>
 296     <li><a href="docs/java/datastore/jpa/index.html">JPA</a>
 297       <ul>
 298             <li><a href="docs/java/datastore/jpa/overview.html">Overview</a></li>
 299
 300       </ul>
 301     </li>
 302     <li><a href="docs/java/javadoc/com/google/appengine/api/datastore/package-summary.html">Javadoc Reference</a></li>
 303
 304       </ul>
 305     </li>
 306     <li><a href="docs/java/apis.html">Services</a>
 307       <ul>
 308         <li><a href="docs/java/appidentity/index.html">App Identity</a>
 309           <ul>
 310             <li><a href="docs/java/appidentity/overview.html">Overview</a></li>
 311
 312 <li><a href="docs/java/javadoc/com/google/appengine/api/appidentity/package-summary.html">Low-level API</a></li>
 313
 314           </ul>
 315         </li>
 316         <li><a href="docs/java/blobstore/index.html">Blobstore</a>
 317           <ul>
 318             <li><a href="docs/java/blobstore/overview.html">Overview</a></li>
 319 <li><span class="tlw-title tlw-expanded">Reference</span>
 320   <ul>
 321     <li><a href="docs/java/javadoc/com/google/appengine/api/blobstore/package-summary.html">API Reference</a></li>
 322   </ul>
 323 </li>
 324
 325           </ul>
 326         </li>
 327         <li><a href="docs/java/googlestorage/index.html">Google Cloud Storage</a>
 328           <ul>
 329             <li><a href="docs/java/googlestorage/overview.html">Overview</a></li>
 330 <li><a href="docs/java/javadoc/com/google/appengine/api/files/package-summary.html">API Reference</a></li>
 331     </li>
 332
 333
 334           </ul>
 335         </li>
 336         <li><a href="docs/java/capabilities/index.html">Capabilities</a>
 337           <ul>
 338             <li><a href="docs/java/capabilities/overview.html">Overview</a></li>
 339 <li><a href="docs/java/javadoc/com/google/appengine/api/capabilities/package-summary.html">Javadoc Reference</a></li>
 340
 341           </ul>
 342         </li>
 343         <li><a href="docs/java/conversion/index.html">Conversion</a>
 344           <ul>
 345             <li><a href="docs/java/conversion/overview.html">Overview</a></li>
 346 <li><a href="docs/java/javadoc/com/google/appengine/api/conversion/package-summary.html">Javadoc Reference</a></li>
 347
 348           </ul>
 349         </li>
 350         <li><a href="docs/java/channel/index.html">Channel</a>
 351           <ul>
 352             <li><a href="docs/java/channel/overview.html">Overview</a></li>
 353 <li><a href="docs/java/javadoc/com/google/appengine/api/channel/package-summary.html">Javadoc Reference</a></li>
 354 <li><a href="docs/java/channel/javascript.html">JavaScript Reference</a></li>
 355
 356           </ul>
 357         </li>
 358         <li><a href="docs/java/images/index.html">Images</a>
 359           <ul>
 360                 <li><a href="docs/java/images/overview.html">Overview</a></li>
 361     <li><a href="docs/java/javadoc/com/google/appengine/api/images/package-summary.html">API Reference</a></li>
 362
 363           </ul>
 364         </li>
 365         <li><a href="docs/java/mail/index.html">Mail</a>
 366           <ul>
 367                 <li><a href="docs/java/mail/overview.html">Overview</a></li>
 368     <li><a href="docs/java/mail/usingjavamail.html">Using JavaMail to Send Mail</a></li>
 369     <li><a href="docs/java/mail/receiving.html">Receiving Mail</a></li>
 370     <li><a href="docs/java/javadoc/com/google/appengine/api/mail/package-summary.html">Low-level API</a></li>
 371
 372           </ul>
 373         </li>
 374         <li><a href="docs/java/memcache/index.html">Memcache</a>
 375           <ul>
 376                 <li><a href="docs/java/memcache/overview.html">Overview</a></li>
 377     <li><a href="docs/java/memcache/usingjcache.html">Using JCache</a></li>
 378     <li><a href="docs/java/javadoc/com/google/appengine/api/memcache/package-summary.html">Low-level API</a></li>
 379
 380           </ul>
 381         </li>
 382         <li><a href="docs/java/multitenancy/index.html">Multitenancy</a>
 383           <ul>
 384                   <li><a href="docs/java/multitenancy/overview.html">Overview</a></li>
 385     <li><a href="docs/java/multitenancy/multitenancy.html">Multitenancy with Namespaces</a></li>
 386     <li><a href="docs/java/multitenancy/namespaces.html">Other Uses for Namespaces</a></li>
 387     <li><a href="docs/java/javadoc/com/google/appengine/api/NamespaceManager.html">API Reference</a></li>
 388
 389           </ul>
 390         </li>
 391         <li><a href="docs/java/oauth/index.html">OAuth</a>
 392           <ul>
 393                 <li><a href="docs/java/oauth/overview.html">Overview</a></li>
 394     <li><a href="docs/java/javadoc/com/google/appengine/api/oauth/package-summary.html">API Reference</a></li>
 395
 396
 397           </ul>
 398         </li>
 399         <li><a href="docs/java/prospectivesearch/index.html">Prospective Search</a>
 400           <ul>
 401             <li><a href="docs/java/prospectivesearch/overview.html">Overview</a></li>
 402 <li><a href="docs/java/javadoc/com/google/appengine/api/prospectivesearch/package-summary.html">Javadoc Reference</a></li>
 403
 404           </ul>
 405         </li>
 406         </li>
 407         <li><a href="docs/java/taskqueue/index.html">Task Queues</a>
 408           <ul>
 409                  <li><a href="docs/java/taskqueue/overview.html">Overview</a></li>
 410      <li><a href="docs/java/taskqueue/overview-push.html">Using Push Queues</a></li>
 411      <li><a href="docs/java/taskqueue/overview-pull.html">Using Pull Queues</a><sup class="new">New!</sup></li>
 412      <li><a href="docs/java/javadoc/com/google/appengine/api/taskqueue/package-summary.html">Javadoc Reference</a></li>
 413      <li><a href="docs/java/taskqueue/rest.html">REST reference</a> <span class="exp-feat">(Experimental)</span></li>
 414           </ul>
 415         </li>
 416         <li><a href="docs/java/urlfetch/index.html">URL Fetch</a>
 417           <ul>
 418                 <li><a href="docs/java/urlfetch/overview.html">Overview</a></li>
 419     <li><a href="docs/java/urlfetch/usingjavanet.html">Using java.net</a></li>
 420     <li><a href="docs/java/javadoc/com/google/appengine/api/urlfetch/package-summary.html">Low-level API</a></li>
 421
 422           </ul>
 423         </li>
 424         <li><a href="docs/java/users/index.html">Users</a>
 425           <ul>
 426                 <li><a href="docs/java/users/overview.html">Overview</a></li>
 427     <li><a href="docs/java/javadoc/com/google/appengine/api/users/package-summary.html">API Reference</a></li>
 428
 429           </ul>
 430         </li>
 431         <li><a href="docs/java/xmpp/index.html">XMPP</a>
 432           <ul>
 433                  <li><a href="docs/java/xmpp/overview.html">Overview</a></li>
 434      <li><a href="docs/java/javadoc/com/google/appengine/api/xmpp/package-summary.html">API Reference</a></li>
 435
 436           </ul>
 437         </li>
 438       </ul>
 439     </li>
 440     <li><a href="docs/java/javadoc/index.html">Services Javadoc</a></li>
 441     <li><a href="docs/java/jrewhitelist.html">JRE Class White List</a></li>
 442     <li><a href="docs/java/config/index.html">Configuration</a>
 443       <ul>
 444             <li><a href="docs/java/config/webxml.html">Deployment Descriptor</a></li>
 445     <li><a href="docs/java/config/appconfig.html">App Config</a></li>
 446     <li><a href="docs/java/config/backends.html">Backends Config</a></li>
 447     <li><a href="docs/java/config/indexconfig.html">Index Config</a></li>
 448     <li><a href="docs/java/config/cron.html">Scheduled Tasks</a></li>
 449     <li><a href="docs/java/config/queue.html">Task Queue Config</a></li>
 450     <li><a href="docs/java/config/dos.html">DoS Protection Config</a></li>
 451
 452       </ul>
 453     </li>
 454     <li><a href="docs/java/configyaml/index.html">YAML Configuration</a>
 455       <ul>
 456                 <li><a href="docs/java/configyaml/appconfig_yaml.html">YAML App Config</a></li>
 457         <li><a href="docs/java/configyaml/backends.html">Backends Config</a></li>
 458         <li><a href="docs/java/configyaml/indexconfig.html">Index Config</a></li>
 459         <li><a href="docs/java/configyaml/cron.html">Scheduled Tasks</a></li>
 460         <li><a href="docs/java/configyaml/queue.html">Task Queue Config</a></li>
 461         <li><a href="docs/java/configyaml/dos.html">DoS Protection Config</a></li>
 462
 463       </ul>
 464     </li>
 465     <li><a href="docs/java/tools/index.html">Tools</a>
 466       <ul>
 467             <li><a href="docs/java/tools/devserver.html">Development Server</a></li>
 468     <li><a href="docs/java/tools/uploadinganapp.html">Uploading and Managing an App</a></li>
 469     <li><a href="docs/java/tools/eclipse.html">Google Plugin for Eclipse</a></li>
 470     <li><a href="docs/java/tools/ant.html">Using Apache Ant</a></li>
 471     <li><a href="docs/java/tools/capabilities.html">Capabilities Service Test Configuration</a>
 472     <li><a href="docs/java/tools/localunittesting.html">Local Unit Testing</a>
 473         <ul>
 474             <li><a href="docs/java/tools/localunittesting/javadoc/index.html">Testing Javadoc</a></li>
 475         </ul>
 476     </li>
 477     <li><a href="docs/java/tools/appstats.html">Appstats</a></li>
 478     <li><a href="docs/java/tools/remoteapi.html">Remote API</a></li>
 479
 480       </ul>
 481     </li>
 482     <li><a href="docs/java/howto/index.html">How-To</a>
 483       <ul>
 484               <li><a href="docs/java/howto/maintenance.html">Handling Scheduled Maintenance Periods</a></li>
 485
 486       </ul>
 487     </li>
 488
 489     </ul>
 490   </li>
 491 </ul>
 492 <div class="line"></div>
 493 <ul>
 494   <li><h2>Python</h2>
 495     <ul>
 496           <li><a href="docs/python/overview.html">Overview</a></li>
 497     <li><a href="docs/python/runtime.html">Runtime Environment</a></li>
 498     <li><a href="docs/python/python27/index.html">Python 2.7</a>
 499       <ul>
 500             <li><a href="docs/python/python27/newin27.html">What's New in Python 2.7</a></li>
 501     <li><a href="docs/python/python27/using27.html">Using Python 2.7</a></li>
 502
 503       </ul>
 504     </li>
 505     <li><a href="docs/python/backends/index.html">Backends</a>
 506       <ul>
 507         <li><a href="docs/python/backends/overview.html">Overview</a></li>
 508 <li><span class="tlw-title tlw-expanded">Reference</span>
 509   <ul>
 510     <li><a href="docs/python/backends/functions.html">Backends API Functions</a></li>
 511     <li><a href="docs/python/backends/exceptions.html">Backends API Exceptions</a></li>
 512     <li><a href="docs/python/backends/logserviceapi.html">LogService API</a></li>
 513     <li><a href="docs/python/backends/applog.html">AppLog Class</a></li>
 514     <li><a href="docs/python/backends/requestlog.html">RequestLog Class</a></li>
 515     <li><a href="docs/python/backends/runtimeapi.html">Runtime API</a></li>
 516   </ul>
 517 </li>
 518
 519       </ul>
 520     </li>
 521     <li><a href="docs/python/datastore/index.html">Storing Data</a>
 522       <ul>
 523               <li><a href="docs/python/datastore/overview.html">Datastore Overview</a></li>
 524       <li><a href="docs/python/datastore/entities.html">Entities</a></li>
 525       <li><a href="docs/python/datastore/queries.html">Queries</a></li>
 526       <li><a href="docs/python/datastore/transactions.html">Transactions</a></li>
 527       <li><a href="docs/python/datastore/datamodeling.html">Data Modeling</a></li>
 528       <li><a href="docs/python/datastore/gqlreference.html">GQL Reference</a></li>
 529       <li><a href="docs/python/datastore/hr/index.html">Choosing a Datastore</a></li>
 530       <li><a href="docs/python/datastore/hr/overview.html">Using the High Replication Datastore</a></li>
 531       <li><a href="docs/python/datastore/metadataqueries.html">Metadata Queries</a></li>
 532       <li><a href="docs/python/datastore/stats.html">Statistics</a></li>
 533       <li><a href="docs/python/datastore/async.html">Async API</a></li>
 534       <li><span class="tlw-title tlw-expanded">Reference</span>
 535         <ul>
 536           <li><a href="docs/python/datastore/typesandpropertyclasses.html">Types and Property Classes</a></li>
 537           <li><a href="docs/python/datastore/gqlreference.html">GQL Reference</a></li>
 538           <li><a href="docs/python/datastore/modelclass.html">Model</a></li>
 539           <li><a href="docs/python/datastore/expandoclass.html">Expando</a></li>
 540           <li><a href="docs/python/datastore/polymodelclass.html">PolyModel</a></li>
 541           <li><a href="docs/python/datastore/propertyclass.html">Property</a></li>
 542           <li><a href="docs/python/datastore/queryclass.html">Query</a></li>
 543           <li><a href="docs/python/datastore/gqlqueryclass.html">GqlQuery</a></li>
 544           <li><a href="docs/python/datastore/metadataqueryclass.html">Metadata Query</a></li>
 545           <li><a href="docs/python/datastore/keyclass.html">Key</a></li>
 546           <li><a href="docs/python/datastore/functions.html">Functions</a></li>
 547           <li><a href="docs/python/datastore/exceptions.html">Exceptions</a></li>
 548         </ul>
 549       </li>
 550
 551       </ul>
 552     </li>
 553     <li><a href="docs/python/dataprocessing/index.html">Data Processing</a>
 554       <ul>
 555              <li><a href="docs/python/dataprocessing/overview.html">Overview</a></li>
 556      <li><a href="docs/python/dataprocessing/helloworld.html">Hello World</a></li>
 557      <li><span class="tlw-title tlw-expanded">Reference</span>
 558        <ul>
 559          <li><a href="docs/python/dataprocessing/mapreducepipelineclass.html">Mapreduce Pipline</a></li>
 560          <li><a href="docs/python/dataprocessing/readers_writers.html">Standard Input Readers and Output Writers</a></li>
 561        </ul>
 562      </li>
 563
 564       </ul>
 565     </li>
 566     <li><a href="docs/python/apis.html">Services</a>
 567       <ul>
 568         <li><a href="docs/python/appidentity/index.html">App Identity</a>
 569           <ul>
 570             <li><a href="docs/python/appidentity/overview.html">Overview</a></li>
 571 <li><span class="tlw-title tlw-expanded">Reference</span>
 572   <ul>
 573     <li><a href="docs/python/appidentity/functions.html">Functions</a></li>
 574     <li><a href="docs/python/appidentity/exceptions.html">Exceptions</a></li>
 575   </ul>
 576 </li>
 577
 578           </ul>
 579         </li>
 580         <li><a href="docs/python/blobstore/index.html">Blobstore</a>
 581           <ul>
 582             <li><a href="docs/python/blobstore/overview.html">Overview</a></li>
 583 <li><span class="tlw-title tlw-expanded">Reference</span>
 584   <ul>
 585     <li><a href="docs/python/blobstore/blobinfoclass.html">BlobInfo</a></li>
 586     <li><a href="docs/python/blobstore/blobkeyclass.html">BlobKey</a></li>
 587     <li><a href="docs/python/blobstore/blobreaderclass.html">BlobReader</a></li>
 588     <li><a href="docs/python/blobstore/functions.html">Functions</a></li>
 589     <li><a href="docs/python/blobstore/exceptions.html">Exceptions</a></li>
 590   </ul>
 591 </li>
 592
 593           </ul>
 594         </li>
 595         <li><a href="docs/python/capabilities/index.html">Capabilities</a>
 596           <ul>
 597             <li><a href="docs/python/capabilities/overview.html">Overview</a></li>
 598 <li><span class="tlw-title tlw-expanded">Reference</span>
 599   <ul>
 600     <li><a href="docs/python/capabilities/capabilitysetclass.html">CapabilitySet</a></li>
 601     <li><a href="docs/python/capabilities/exceptions.html">Exceptions</a></li>
 602   </ul>
 603 </li>
 604
 605           </ul>
 606         </li>
 607         <li><a href="docs/python/conversion/index.html">Conversion</a>
 608           <ul>
 609             <li><a href="docs/python/conversion/overview.html">Overview</a></li>
 610 <li><span class="tlw-title tlw-expanded">Reference</span>
 611   <ul>
 612     <li><a href="docs/python/conversion/conversionclass.html">Conversion Class</a></li>
 613     <li><a href="docs/python/conversion/propertyclasses.html">Property Classes</a></li>
 614     <li><a href="docs/python/conversion/functions.html">Functions</a></li>
 615     <li><a href="docs/python/conversion/exceptions.html">Exceptions</a></li>
 616   </ul>
 617 </li>
 618
 619           </ul>
 620         </li>
 621         <li><a href="docs/python/channel/index.html">Channel</a>
 622           <ul>
 623             <li><a href="docs/python/channel/overview.html">Overview</a></li>
 624 <li><span class="tlw-title tlw-expanded">Reference</span>
 625   <ul>
 626     <li><a href="docs/python/channel/functions.html">Functions</a></li>
 627     <li><a href="docs/python/channel/exceptions.html">Exceptions</a></li>
 628     <li><a href="docs/python/channel/javascript.html">Client Javascript Reference</a></li>
 629   </ul>
 630 </li>
 631
 632           </ul>
 633         </li>
 634         <li><a href="docs/python/images/index.html">Images</a>
 635           <ul>
 636                  <li><a href="docs/python/images/overview.html">Overview</a></li>
 637      <li><a href="docs/python/images/installingPIL.html">Installing PIL</a></li>
 638      <li><a href="docs/python/images/usingimages.html">Using the Images API</a></li>
 639      <li><span class="tlw-title tlw-expanded">Reference</span>
 640        <ul>
 641          <li><a href="docs/python/images/imageclass.html">Image</a></li>
 642          <li><a href="docs/python/images/functions.html">Functions</a></li>
 643          <li><a href="docs/python/images/exceptions.html">Exceptions</a></li>
 644        </ul>
 645      </li>
 646
 647           </ul>
 648         </li>
 649         <li><a href="docs/python/mail/index.html">Mail</a>
 650           <ul>
 651                  <li><a href="docs/python/mail/overview.html">Overview</a></li>
 652      <li><a href="docs/python/mail/sendingmail.html">Sending Mail</a></li>
 653      <li><a href="docs/python/mail/receivingmail.html">Receiving Mail</a></li>
 654      <li><a href="docs/python/mail/attachments.html">Attachments</a></li>
 655      <li><a href="docs/python/mail/headers.html">Headers</a></li>
 656      <li><span class="tlw-title tlw-expanded">Reference</span>
 657        <ul>
 658          <li><a href="docs/python/mail/emailmessageclass.html">EmailMessage</a></li>
 659          <li><a href="docs/python/mail/emailmessagefields.html">Message Fields</a></li>
 660          <li><a href="docs/python/mail/functions.html">Functions</a></li>
 661          <li><a href="docs/python/mail/exceptions.html">Exceptions</a></li>
 662        </ul>
 663      </li>
 664
 665           </ul>
 666         </li>
 667         <li><a href="docs/python/memcache/index.html">Memcache</a>
 668           <ul>
 669                  <li><a href="docs/python/memcache/overview.html">Overview</a></li>
 670       <li><a href="docs/python/memcache/usingmemcache.html">Using Memcache</a></li>
 671      <li><span class="tlw-title tlw-expanded">Reference</span>
 672        <ul>
 673          <li><a href="docs/python/memcache/clientclass.html">Client</a></li>
 674          <li><a href="docs/python/memcache/functions.html">Functions</a></li>
 675        </ul>
 676      </li>
 677
 678           </ul>
 679         </li>
 680         <li><a href="docs/python/multitenancy/index.html">Multitenancy</a>
 681           <ul>
 682                   <li><a href="docs/python/multitenancy/overview.html">Overview</a></li>
 683     <li><a href="docs/python/multitenancy/multitenancy.html">Multitenancy with Namespaces</a></li>
 684     <li><a href="docs/python/multitenancy/namespaces.html">Other Uses for Namespaces</a></li>
 685     <li>Reference
 686       <ul>
 687         <li><a href="docs/python/multitenancy/functions.html">Functions</a></li>
 688         <li><a href="docs/python/multitenancy/exceptions.html">Exceptions</a></li>
 689       </ul>
 690     </li>
 691
 692           </ul>
 693         </li>
 694         <li><a href="docs/python/oauth/index.html">OAuth</a>
 695           <ul>
 696                  <li><a href="docs/python/oauth/overview.html">Overview</a></li>
 697      <li><span class="tlw-title tlw-expanded">Reference</span>
 698        <ul>
 699          <li><a href="docs/python/oauth/functions.html">Functions</a></li>
 700          <li><a href="docs/python/oauth/exceptions.html">Exceptions</a></li>
 701        </ul>
 702      </li>
 703
 704           </ul>
 705         </li>
 706         <li><a href="docs/python/prospectivesearch/index.html">Prospective Search</a>
 707           <ul>
 708             <li><a href="docs/python/prospectivesearch/overview.html">Overview</a></li>
 709 <li><span class="tlw-title tlw-expanded">Reference</span>
 710   <ul>
 711     <li><a href="docs/python/prospectivesearch/functions.html">Functions</a></li>
 712     <li><a href="docs/python/prospectivesearch/exceptions.html">Exceptions</a></li>
 713   </ul>
 714 </li>
 715
 716           </ul>
 717         </li>
 718          <li><a href="docs/python/googlestorage/index.html">Google Cloud Storage</a>
 719           <ul>
 720             <li><a href="docs/python/googlestorage/overview.html">Overview</a></li>
 721 <li><a href="docs/python/googlestorage/functions.html">Functions</a></li>
 722 <li><a href="docs/python/googlestorage/exceptions.html">Exceptions</a></li>
 723     </li>
 724
 725
 726           </ul>
 727         </li>
 728         <li><a href="docs/python/taskqueue/index.html">Task Queues</a>
 729           <ul>
 730                  <li><a href="docs/python/taskqueue/overview.html">Overview</a></li>
 731      <li><a href="docs/python/taskqueue/overview-push.html">Using Push Queues</a></li>
 732      <li><a href="docs/python/taskqueue/overview-pull.html">Using Pull Queues</a><sup class="new">New!</sup></li>
 733      <li><span class="tlw-title tlw-expanded">Reference</span>
 734        <ul>
 735          <li><a href="docs/python/taskqueue/tasks.html">Task Class</a></li>
 736          <li><a href="docs/python/taskqueue/taskretryoptions.html">TaskRetryOptions Class</a></li>
 737          <li><a href="docs/python/taskqueue/queues.html">Queue Class</a></li>
 738          <li><a href="docs/python/taskqueue/rest.html">REST</a>  <span class="exp-feat">(Experimental)</span></li>
 739          <li><a href="docs/python/taskqueue/functions.html">Functions</a></li>
 740          <li><a href="docs/python/taskqueue/exceptions.html">Exceptions</a></li>
 741        </ul>
 742      </li>
 743
 744           </ul>
 745         </li>
 746         <li><a href="docs/python/urlfetch/index.html">URL Fetch</a>
 747           <ul>
 748                  <li><a href="docs/python/urlfetch/overview.html">Overview</a></li>
 749      <li><span class="tlw-title tlw-expanded">Reference</span>
 750        <ul>
 751          <li><a href="docs/python/urlfetch/fetchfunction.html">The fetch Function</a></li>
 752          <li><a href="docs/python/urlfetch/asynchronousrequests.html">Asynchronous Requests</a></li>
 753          <li><a href="docs/python/urlfetch/responseobjects.html">Response Objects</a></li>
 754          <li><a href="docs/python/urlfetch/exceptions.html">Exceptions</a></li>
 755        </ul>
 756      </li>
 757
 758           </ul>
 759         </li>
 760         <li><a href="docs/python/users/index.html">Users</a>
 761           <ul>
 762                  <li><a href="docs/python/users/overview.html">Overview</a></li>
 763      <li><a href="docs/python/users/userobjects.html">User Objects</a></li>
 764      <li><a href="docs/python/users/loginurls.html">Login URLs</a></li>
 765      <li><a href="docs/python/users/adminusers.html">Admin Users</a></li>
 766
 767      <li><span class="tlw-title tlw-expanded">Reference</span>
 768        <ul>
 769          <li><a href="docs/python/users/userclass.html">User</a></li>
 770          <li><a href="docs/python/users/functions.html">Functions</a></li>
 771          <li><a href="docs/python/users/exceptions.html">Exceptions</a></li>
 772        </ul>
 773      </li>
 774
 775           </ul>
 776         </li>
 777         <li><a href="docs/python/xmpp/index.html">XMPP</a>
 778           <ul>
 779                  <li><a href="docs/python/xmpp/overview.html">Overview</a></li>
 780      <li><span class="tlw-title tlw-expanded">Reference</span>
 781        <ul>
 782          <li><a href="docs/python/xmpp/functions.html">Functions</a></li>
 783          <li><a href="docs/python/xmpp/messageclass.html">Message</a></li>
 784          <li><a href="docs/python/xmpp/exceptions.html">Exceptions</a></li>
 785        </ul>
 786      </li>
 787
 788           </ul>
 789         </li>
 790       </ul>
 791     </li>
 792     <li><a href="docs/python/config/index.html">Configuration</a>
 793       <ul>
 794             <li><a href="docs/python/config/appconfig.html">App Config</a></li>
 795     <li><a href="docs/python/config/backends.html">Backends Config</a></li>
 796     <li><a href="docs/python/config/indexconfig.html">Index Config</a></li>
 797     <li><a href="docs/python/config/cron.html">Scheduled Tasks</a></li>
 798     <li><a href="docs/python/config/queue.html">Task Queue Config</a></li>
 799     <li><a href="docs/python/config/dos.html">DoS Protection Config</a></li>
 800
 801       </ul>
 802     </li>
 803     <li><span class="tlw-title"><a href="docs/python/tools/index.html">Tools</a></span>
 804       <ul>
 805             <li><a href="docs/python/tools/devserver.html">Development Server</a></li>
 806     <li><a href="docs/python/tools/uploadinganapp.html">Uploading and Managing an App</a></li>
 807     <li><a href="docs/python/tools/uploadingdata.html">Uploading and Downloading Data</a></li>
 808     <li><span class="tlw-title"><a href="docs/python/tools/protorpc/index.html">ProtoRPC</a></span>
 809       <ul>
 810         <li><a href="docs/python/tools/protorpc/overview.html">Overview</a></li>
 811 <li><a href="docs/python/tools/protorpc/definition-functions.html">Definition Module</a></li>
 812 <li>Descriptor Module
 813   <ul>
 814         <li><a href="docs/python/tools/protorpc/descriptor/descriptorlibrary.html">DescriptorLibrary Functions</a></li>
 815     <li><a href="docs/python/tools/protorpc/descriptor/functions.html">Functions</a></li>
 816
 817   </ul>
 818 </li>
 819 <li>Messages Module
 820   <ul>
 821         <li><a href="docs/python/tools/protorpc/messages/enumclass.html">Enum</a></li>
 822     <li><a href="docs/python/tools/protorpc/messages/enumfieldclass.html">EnumField</a></li>
 823     <li><a href="docs/python/tools/protorpc/messages/fieldclass.html">Field</a></li>
 824     <li><a href="docs/python/tools/protorpc/messages/fieldclasses.html">Message Field Classes</a></li>
 825     <li><a href="docs/python/tools/protorpc/messages/messageclass.html">Message</a></li>
 826     <li><a href="docs/python/tools/protorpc/messages/messagefieldclass.html">MessageField</a></li>
 827     <li><a href="docs/python/tools/protorpc/messages/variantclass.html">Variant</a></li>
 828     <li><a href="docs/python/tools/protorpc/messages/functions.html">Functions</a></li>
 829     <li><a href="docs/python/tools/protorpc/messages/exceptions.html">Exceptions</a></li>
 830   </ul>
 831 </li>
 832 <li>Remote Service Library
 833   <ul>
 834         <li><a href="docs/python/tools/protorpc/remote/index.html">Overview</a></li>
 835     <li><a href="docs/python/tools/protorpc/remote/httprequeststateclass.html">HttpRequestState Class</a></li>
 836     <li><a href="docs/python/tools/protorpc/remote/requeststateclass.html">RequestState Class</a></li>
 837     <li><a href="docs/python/tools/protorpc/remote/rpcstatusclass.html">RpcStatus Class</a></li>
 838     <li><a href="docs/python/tools/protorpc/remote/serviceclass.html">Service Class</a></li>
 839     <li><a href="docs/python/tools/protorpc/remote/functions.html">Functions</a></li>
 840     <li><a href="docs/python/tools/protorpc/remote/exceptions.html">Exceptions</a></li>
 841
 842   </ul>
 843 </li>
 844 <li>Transport Library
 845   <ul>
 846         <li><a href="docs/python/tools/protorpc/transport/httptransport.html">HttpTransport Class</a></li>
 847     <li><a href="docs/python/tools/protorpc/transport/transport.html">Transport Class</a></li>
 848
 849   </ul>
 850 </li>
 851 <li>WebApp Service Handlers
 852   <ul>
 853         <li><a href="docs/python/tools/protorpc/webapp/index.html">Overview</a></li>
 854     <li><a href="docs/python/tools/protorpc/webapp/functions.html">WebApp Service Handlers</a></li>
 855
 856   </ul>
 857 </li>
 858
 859       </ul>
 860     </li>
 861     <li><a href="docs/python/tools/webapp/index.html">webapp Framework</a>
 862       <ul>
 863              <li><a href="docs/python/tools/webapp/overview.html">Overview</a></li>
 864      <li><a href="docs/python/tools/webapp/running.html">Running the Application</a></li>
 865      <li><a href="docs/python/tools/webapp/requesthandlers.html">Request Handlers</a></li>
 866      <li><a href="docs/python/tools/webapp/requestdata.html">Request Data</a></li>
 867      <li><a href="docs/python/tools/webapp/buildingtheresponse.html">Building the Response</a></li>
 868      <li><a href="docs/python/tools/webapp/redirects.html">Redirects, Headers and Status Codes</a></li>
 869      <li><a href="docs/python/tools/webapp/blobstorehandlers.html">Blobstore Handlers</a></li>
 870
 871      <li><span class="tlw-title tlw-expanded">Reference</span>
 872        <ul>
 873          <li><a href="docs/python/tools/webapp/requestclass.html">Request</a></li>
 874          <li><a href="docs/python/tools/webapp/responseclass.html">Response</a></li>
 875          <li><a href="docs/python/tools/webapp/requesthandlerclass.html">RequestHandler</a></li>
 876          <li><a href="docs/python/tools/webapp/wsgiapplicationclass.html">WSGIApplication</a></li>
 877          <li><a href="docs/python/tools/webapp/utilmodule.html">Utility Functions</a></li>
 878
 879        </ul>
 880      </li>
 881
 882       </ul>
 883     </li>
 884     <li><a href="docs/python/tools/localunittesting.html">Local Unit Testing</a></li>
 885     <li><a href="docs/python/tools/appstats.html">Appstats</a></li>
 886     <li><a href="docs/python/tools/libraries.html">Included Libraries </a>(Python 2.5)</li>
 887     <li><a href="docs/python/tools/libraries27.html">Included Libraries</a>(Python 2.7)</li>
 888     <li><a href="docs/python/tools/appengineconfig.html">Python Module Configuration</a></li>
 889
 890       </ul>
 891     </li>
 892     <li><a href="docs/python/howto/index.html">How-To</a>
 893       <ul>
 894               <li><a href="docs/python/howto/usinggdataservices.html">Google Data Services</a></li>
 895       <li><a href="docs/python/howto/maintenance.html">Handling Scheduled Maintenance Periods</a></li>
 896
 897       </ul>
 898     </li>
 899
 900     </ul>
 901   </li>
 902 </ul>
 903 <div class="line"></div>
 904 <ul>
 905   <li><h2>Go</h2> <span class="exp-feat">Experimental!</span>
 906     <ul>
 907           <li><a href="docs/go/overview.html">Overview</a></li>
 908     <li><a href="docs/go/runtime.html">Runtime Environment</a>
 909       <ul>
 910         <li><a href="docs/go/reference.html">Reference</a></li>
 911       </ul>
 912     </li>
 913     <li><a href="docs/go/backends/index.html">Backends</a>
 914       <ul>
 915         <li><a href="docs/go/backends/overview.html">Overview</a></li>
 916 <li><a href="docs/go/backends/runtime.html">Runtime package</a></li>
 917
 918       </ul>
 919     </li>
 920     <li><a href="docs/go/datastore/index.html">Storing Data</a>
 921       <ul>
 922              <li><a href="docs/go/datastore/overview.html">Overview</a></li>
 923      <li><a href="docs/go/datastore/transactions.html">Transactions</a></li>
 924      <li><a href="docs/go/datastore/reference.html">Reference</a></li>
 925
 926       </ul>
 927     </li>
 928     <li><a href="docs/go/apis.html">Services</a>
 929       <ul>
 930         <li><a href="docs/go/blobstore/index.html">Blobstore</a>
 931           <ul>
 932             <li><a href="docs/go/blobstore/overview.html">Overview</a></li>
 933 <li><a href="docs/go/blobstore/reference.html">Reference</a></li>
 934
 935           </ul>
 936         </li>
 937         <li><a href="docs/go/capabilities/index.html">Capabilities</a>
 938           <ul>
 939             <li><a href="docs/go/capabilities/overview.html">Overview</a></li>
 940 <li><a href="docs/go/capabilities/reference.html">Reference</a></li>
 941
 942           </ul>
 943         </li>
 944         <li><a href="docs/go/channel/index.html">Channel</a>
 945           <ul>
 946             <li><a href="docs/go/channel/overview.html">Overview</a></li>
 947 <li><a href="docs/go/channel/reference.html">Reference</a></li>
 948 <li><a href="docs/go/channel/javascript.html">Client Javascript Reference</a></li>
 949
 950           </ul>
 951         </li>
 952         <li><a href="docs/go/mail/index.html">Mail</a>
 953           <ul>
 954                  <li><a href="docs/go/mail/overview.html">Overview</a></li>
 955      <li><a href="docs/go/mail/reference.html">Reference</a></li>
 956
 957           </ul>
 958         </li>
 959         <li><a href="docs/go/memcache/index.html">Memcache</a>
 960           <ul>
 961                  <li><a href="docs/go/memcache/overview.html">Overview</a></li>
 962      <li><a href="docs/go/memcache/reference.html">Reference</a></li>
 963
 964           </ul>
 965         </li>
 966         <li><a href="docs/go/taskqueue/index.html">Task Queues</a>
 967           <ul>
 968                  <li><a href="docs/go/taskqueue/overview.html">Overview</a></li>
 969      <li><a href="docs/go/taskqueue/reference.html">Reference</a></li>
 970      <li><a href="docs/go/taskqueue/delay.html">Delay package</a></li>
 971
 972           </ul>
 973         </li>
 974         <li><a href="docs/go/urlfetch/index.html">URL Fetch</a>
 975           <ul>
 976                  <li><a href="docs/go/urlfetch/overview.html">Overview</a></li>
 977      <li><a href="docs/go/urlfetch/reference.html">Reference</a></li>
 978
 979           </ul>
 980         </li>
 981         <li><a href="docs/go/users/index.html">Users</a>
 982           <ul>
 983                  <li><a href="docs/go/users/overview.html">Overview</a></li>
 984      <li><a href="docs/go/users/reference.html">Reference</a></li>
 985
 986           </ul>
 987         </li>
 988       </ul>
 989         <li><a href="docs/go/config/index.html">Configuration</a>
 990           <ul>
 991                 <li><a href="docs/go/config/appconfig.html">App Config</a></li>
 992     <li><a href="docs/go/config/backends.html">Backends Config</a></li>
 993     <li><a href="docs/go/config/indexconfig.html">Index Config</a></li>
 994     <li><a href="docs/go/config/cron.html">Scheduled Tasks</a></li>
 995     <li><a href="docs/go/config/queue.html">Task Queue Config</a></li>
 996     <li><a href="docs/go/config/dos.html">DoS Protection Config</a></li>
 997
 998           </ul>
 999         </li>
1000         <li><a href="docs/go/tools/index.html">Tools</a>
1001           <ul>
1002                 <li><a href="docs/go/tools/devserver.html">Development Server</a></li>
1003     <li><a href="docs/go/tools/uploadinganapp.html">Uploading and Managing an App</a></li>
1004
1005           </ul>
1006         </li>
1007     </li>
1008
1009     </ul>
1010   </li>
1011 </ul>
1012 <div class="line"></div>
1013 <ul>
1014   <li><h2>Managing Your App</h2>
1015     <ul>
1016       <li><a href="docs/adminconsole/index.html">Admin Console</a>
1017         <ul>
1018           <li><a href="docs/adminconsole/instances.html">Instances</a></li>
1019 <li><a href="docs/adminconsole/roles.html">Roles</a></li>
1020 <li><a href="docs/adminconsole/applicationsettings.html">Application Settings</a></li>
1021 <li><a href="docs/adminconsole/datastoreadmin.html">Datastore</a></li>
1022 <li><a href="docs/adminconsole/performancesettings.html">Performance Settings</a></li>
1023
1024         </ul>
1025       </li>
1026       <li><a href="docs/quotas.html">Quotas</a></li>
1027       <li><a href="docs/billing.html">Billing</a></li>
1028       <li><a href="docs/premier/index.html">Premier Accounts</a></li>
1029       <li><a href="docs/domain.html">Using a Custom Domain</a></li>
1030     </ul>
1031   </li>
1032 </ul>
1033 <div class="line"></div>
1034 <ul>
1035   <li><h2>Resources</h2>
1036     <ul>
1037       <li><a href="kb/index.html">FAQ</a></li>
1038       <li><a href="articles/index.html">Articles</a></li>
1039       <li><a href="docs/videoresources.html">Video Resources</a><sup class="new">New!</sup></li>
1040       <li><a href="http://code.google.com/p/googleappengine/">SDK Code</a></li>
1041       <li><a href="http://code.google.com/p/datanucleus-appengine/">JDO/JPA Code</a></li>
1042       <li><a href="http://code.google.com/p/google-app-engine-samples/">Sample Apps Code</a></li>
1043       <li>Launcher Code
1044         <ul>
1045           <li><a href="http://code.google.com/p/google-appengine-mac-launcher/">Mac</a></li>
1046           <li><a href="http://code.google.com/p/google-appengine-wx-launcher/">Windows/wx</a></li>
1047         </ul>
1048       </li>
1049       <li><a href="community.html">Discussion Groups</a></li>
1050     </ul>
1051   </li>
1052 </ul>
1053 <div class="line"></div>
1054 <ul>
1055   <li><a href="docs/roadmap.html">Product Roadmap</a></li>
1056   <li><a href="http://code.google.com/p/googleappengine/wiki/SdkReleaseNotes">Release Notes: Python</a></li>
1057   <li><a href="http://code.google.com/p/googleappengine/wiki/SdkForJavaReleaseNotes">Release Notes: Java</a></li>
1058   <li><a href="docs/revision_history.html">Revision History</a></li>
1059 </ul>
1060
1061         <a class="hidden" href="#gc-topnav-anchor">More Google App Engine resource links</a>
1062       </div>
1063
1064       <div class="g-unit" id="gc-pagecontent">
1065         <h1 class="page_title">Why App Engine</h1>
1066
1067
1068
1069 <div id="jd-content">
1070 <p>
1071   Google App Engine enables you to build web applications on the same scalable
1072   systems that power Google applications. App Engine applications are easy to
1073   build, easy to maintain, and easy to scale as your traffic and data storage
1074   needs grow. With App Engine, there are no servers to maintain: You just
1075   upload your application, and it's ready to serve to your users.
1076 </p>
1077 <p>
1078   Find out why App Engine may be right for your business.
1079 </p>
1080 <ul>
1081   <li><a href="#start">Easy to get Started</a></li>
1082   <li><a href="#norisk">Free and Risk-free Development</a></li>
1083   <li><a href="#scale">Automatic Scalability</a></li>
1084   <li>
1085     <a href="#reliable">The reliability, performance and security of
1086     Google's infrastructure</a>
1087   </li>
1088 </ul>
1089
1090 <div class="jd-descr">
1091 <h2 id="start">Easy to get Started</h2>
1092 <div style="width:800px">
1093 <p>
1094   App Engine is a complete development stack that uses familiar technologies to
1095   build and host web applications. With App Engine you write your application
1096   code, test it on your local machine and upload it to Google with a simple
1097   click of a button or command line script. Once your application is uploaded
1098   to Google we host and scale your application for you. You no longer need to
1099   worry about system administration, bringing up new instances of your
1100   application, sharding your database or buying machines. We take care of all
1101   the maintenance so you can focus on features for your users.
1102 </p>
1103 </div>
1104
1105 <h2 id="norisk">Free and Risk-free Development</h2>
1106 <div style="width:800px">
1107 <p>
1108   Not only is creating an App Engine application easy, it's free! You can
1109   create an account and publish an application that people can use right
1110   away at no charge, and with no obligation. When you need to use more
1111   resources, you can enable billing and allocate your budget according to your
1112   needs. Detailed pricing for usage that has exceeded the free quota on
1113   our <a href="http://code.google.com/appengine/docs/billing.html">Billing
1114   page</a>.
1115 </p>
1116 </div>
1117
1118 <h2 id="scale">Automatic Scalability</h2>
1119 <div style="width:800px">
1120 <p>
1121   For the the first time your applications can take advantage of the same
1122   scalable technologies that Google applications are built on, things like
1123   BigTable and GFS. Automatic scaling is built in with App Engine, all you have
1124   to do is write your application code and we'll do the rest. No matter how
1125   many users you have or how much data your application stores, App Engine can
1126   scale to meet your needs.
1127 </p>
1128 </div>
1129
1130 <h2 id="reliable">The reliability, performance and security of Google's infrastructure</h2>
1131 <div style="width:800px">
1132 <p>
1133   Google has a reputation for highly reliable, high performance infrastructure.
1134   With App Engine you can take advantage of the 10 years of knowledge Google
1135   has in running massively scalable, performance driven systems. The same
1136   security, privacy and data protection policies we have for Google's
1137   applications applies to all App Engine applications. We take security very
1138   seriously and have measures in place to protect your code and application
1139   data.
1140 </p>
1141 </div>
1142
1143 </div>
1144
1145 </div>
1146
1147
1148       </div><!-- end gc-pagecontent -->
1149    </div><!-- end gooey wrapper -->
1150
1151     </div> <!-- end codesite content -->
1152
1153
1154 <div id="gc-footer" dir="ltr">
1155   <div class="text">
1156
1157       <div class="notice"><div id="notice" style="text-align: center; border: 1em 0em 1em 0em">
1158   Except as otherwise <a
1159   href="http://code.google.com/policies.html#restrictions">noted</a>,
1160   the content of this page is licensed under the <a rel="license"
1161   href="http://creativecommons.org/licenses/by/3.0/">Creative Commons
1162   Attribution 3.0 License</a>, and code samples are licensed under the
1163   <a rel="license" href="http://www.apache.org/licenses/LICENSE-2.0">Apache
1164   2.0 License</a>.
1165 <!-- <rdf:RDF xmlns="http://web.resource.org/cc/"
1166               xmlns:dc="http://purl.org/dc/elements/1.1/"
1167               xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
1168   <Work rdf:about="">
1169     <license rdf:resource="http://creativecommons.org/licenses/by/3.0/" />
1170   </Work>
1171   <License rdf:about="http://creativecommons.org/licenses/by/3.0/">
1172     <permits rdf:resource="http://web.resource.org/cc/Reproduction"/>
1173     <permits rdf:resource="http://web.resource.org/cc/Distribution"/>
1174     <requires rdf:resource="http://web.resource.org/cc/Notice"/>
1175     <requires rdf:resource="http://web.resource.org/cc/Attribution"/>
1176     <permits rdf:resource="http://web.resource.org/cc/DerivativeWorks"/>
1177   </License>
1178 </rdf:RDF> -->
1179 </div>
1180 Java is a registered trademark of Oracle Corporation and/or its affiliates</div>
1181
1182     ©2011 Google -
1183     <a href="http://code.google.com">Code Home</a> -
1184     <a href="http://code.google.com/terms.html">Site Terms of Service</a> -
1185     <a href="http://code.google.com/privacy.html">Privacy Policy</a> -
1186     <a href="http://code.google.com/more">Site Directory</a>
1187     <br> <br>
1188     Google Code offered in:
1189     <a href="http://code.google.com/intl/en">English</a> -
1190     <a href="http://code.google.com/intl/es">Español</a> -
1191     <a href="http://code.google.com/intl/ja">日本語</a> -
1192     <a href="http://code.google.com/intl/ko">한국어</a> -
1193     <a href="http://code.google.com/intl/pt-BR">Português</a> -
1194     <a href="http://code.google.com/intl/ru">Pусский</a> -
1195     <a href="http://code.google.com/intl/zh-CN">中文(简体)</a> -
1196     <a href="http://code.google.com/intl/zh-TW">中文(繁體)</a>
1197   </div>
1198 </div><!-- end gc-footer -->
1199
1200 </div><!-- end gc-container -->
1201
1202 <script type="text/javascript">CODESITE_CSITimer['load'].tick('ats');</script>
1203 <script src="../js/codesite_tail.pack.04102009.js" type="text/javascript"></script>
1204 <script type="text/javascript" src="https://apis.google.com/js/plusone.js"></script>
1205
1206
1207
1208
1209
1210   </body>
1211 </html>
1212
1213