本文详细介绍了使用HTML5离线缓存机制的工作流程，包括如何通过解析HTML标签发送manifest请求，以及缓存资源的更新、加载过程。同时，还探讨了资源加载与缓存保存的具体实现。
<html manifest="xxx">
缓存构成 url+.manifest+manifest 或者 url (没有manifest)
webkit解析html标签,发送(异步).manifest请求
->HTMLTreeBuilder::processStartTag
->HTMLConstructionSite::insertHTMLHtmlStartTagBeforeHTML
->HTMLHtmlElement::insertedByParser
->documentLoader->applicationCacheHost()->selectCacheWithManifest或者selectCacheWithoutManifest
(创建ApplicationCacheGroup)
->ApplicationCacheGroup::update->ApplicationCacheGroup::createResourceHandle
发送manifest请求,ApplicationCacheGroup作为ResourceHandleClient
-----------------异步-------------------
根据.manifest发送(异步)缓存请求
->ApplicationCacheGroup::didReceiveResponse
->ApplicationCacheGroup::didReceiveData
收到manifest
->ApplicationCacheGroup::didFinishLoading
解析manifest (缓存队列)
-----------------------------------------
->ApplicationCacheGroup::startLoadingEntry
->ApplicationCacheGroup::createResourceHandle
依次发送请求获取缓存资源
->ApplicationCacheGroup::didReceiveResponse
->ApplicationCacheResource::create (创建CacheResource)
->ApplicationCacheGroup::didReceiveData
->(填充CacheResource)
->ApplicationCacheGroup::didFinishLoading
-----------------------------------------
保存缓存
->ApplicationCacheGroup::deliverDelayedMainResources
->finishedLoadingMainResource
->创建主url的CacheResource
->ApplicationCacheGroup::checkIfLoadIsComplete
->ApplicationCacheStorage::storeNewestCache
保存在.db文件里面
*******************************************
第二次访问根据url映射从本地数据库取缓存
->MainResourceLoader::load
->ApplicationCacheHost::maybeLoadMainResource
->ApplicationCacheGroup::cacheForMainRequest
->SubstituteData(resource->data(), resource->response().mimeType(), resource->response().textEncodingName(), KURL());
获得缓存数据
->(同步)MainResourceLoader::didReceiveResponse
->(同步)MainResourceLoader::didReceiveData
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