This interface provides a way to stream data to the web browser. This allows
 loading of data from sources which can not be accessed using URIs and
 nsIWebNavigation.

 @status FROZEN
[scriptable, uuid(86d02f0e-219b-4cfc-9c88-bd98d2cce0b8)]
interface nsIWebBrowserStream : nsISupports

Methods

 Append data to this stream.
 @param aData The data to append
 @param aLen  Length of the data to append.

 @note To append more than 4 GB of data, call this method multiple times.
void appendToStream([const, array, size_is(aLen)] in octet aData, in unsigned long aLen) 
 Notifies the browser that all the data has been appended. This may notify
 the user that the browser is "done loading" in some form.

 @throw NS_ERROR_UNEXPECTED
        This method was called without a preceding openStream.
void closeStream() 
 Prepare to load a stream of data. When this function returns successfully,
 it must be paired by a call to closeStream.

 @param aBaseURI
        The base URI of the data. Must not be null. Relative
        URIs will be resolved relative to this URI.
 @param aContentType
        ASCII string giving the content type of the data. If rendering
        content of this type is not supported, this method fails.
        This string may include a charset declaration, for example:
        text/html;charset=ISO-8859-1

 @throw NS_ERROR_NOT_AVAILABLE
        The requested content type is not supported.
 @throw NS_ERROR_IN_PROGRESS
        openStream was called twice without an intermediate closeStream.
void openStream(in nsIURI aBaseURI, in ACString aContentType)