Inadvertently flushed traffic (when the img src value is blank, 2 requests, etc)

When the img src value is null, two requests

Some people have encountered similar situations before. When there is a tag similar to , an extra request will be made to the page, AccordingArticleAnalysis, I guess all the tags that will actively introduce external files will have such problems, such as embed, Link, etc, Therefore, it is verified by experiment. The following is a preliminary conclusion:     Tag\Number of requests\Browser IE FF IMG 2 2   Embed 1 2   Background: URL 1 2   Link 1 2   Input type = 'image' 2 2   Script 1 2   Bgsound 2 -   Note: 1.The two request pages of IE and Firefox are different. IE: the request isWhere the accessed file is locatedDirectory,For exampleIMGTag time, 2The request is Http://www.xxxx.cn/test/ FF: the request isAccessed File 2.ForEmbedLabel. The preceding description is as follows:TypeNot emptyWhen type is null, FF request 1 and IE are different based on the Type value. 3.If the above label does not contain src = ", no secondary request will be made.   Thank you ~