BackgroundRight now, XHR uses SubresourceLoader directly, but this doesn't work well if the XHR is running on another thread (which happens for workers). As described before ( http://docs.google.com/View?docID=dg7mj9sd_6dvthmdqj&revision=_latest), I'm working on making the actual request underneath the XHR happen on the main thread for workers. Proposal To make this happen transparently, I would like to have a new loader class that is used by XHR. It is a thin wrapper over SubresourceLoader when the XHR is done for a Document, but when done on a worker, it sends messages to the main thread to do the work. I was thinking about calling the class ScriptResourceLoader. It is stripped down from SubresourceLoader / ResourceLoader to have only the items that are needed by XHR (to reduce the amount of work to be done for the Worker implementation of it). Here's what it looks like: class ScriptResourceLoader { public: static PassRefPtr<ScriptResourceLoader> create(ScriptExecutionContext*, ScriptResourceLoaderClient*, const ResourceRequest&, bool skipCanLoadCheck, bool sendResourceLoadCallbacks, bool shouldContentSniff); virtual ~ScriptResourceLoader() {} virtual void cancel() = 0; virtual void ref() = 0; virtual void deref() = 0; }; class ScriptResourceLoaderClient { public: virtual ~ScriptResourceLoaderClient() {} virtual void didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent) { } virtual void didReceiveResponse(const ResourceResponse&) { } virtual void didReceiveData(const char*, int) { } virtual void didFinishLoading(int resourceIdentifer) { } virtual void didFail(bool isCancellation) { } virtual void securityOriginDenyRequest() { } virtual void receivedCancellation(const ResourceResponse&) { } }; Question Do you have any feedback about the naming of the class or its functionality? Thanks, Dave