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This article is about how to solve the problem of two requests when the value of the src attribute of the img tag is empty. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

2 requests when the img SRC value is empty

Some students should have encountered a similar situation before, when there is a similar situation such as

One more request will be made to the page when the tag of

According to the analysis of an article, I guess that all tags that actively introduce external files will have such problems, such as embed, link, etc.

So it is verified by the way of experiment.

The following are the preliminary conclusions:

Tag / number of requests / browser IEFF,safari,chromeImg22Embed12Background: url12Link12Input type='image'22Script12bgsound2-

Note:

1. For the two requests of IE and firefox, the requested page is different.

IE: request the directory where the accessed file is located, such as the img tag, and the second request is http://www.xxxx.cn/test/.

FF,safari,chrome: the file being accessed is requested

two。 For embed tags, the situation described above is that when type is not empty and type is empty, FF requests 1, and IE varies according to the type value.

3. If src= "" is not included in the above tag, a second request will not occur.

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