The browser refreshes the page and sends two requests to the server.

1.1.1 symptom

Refresh the page in IE and Firefox, and the server receives two identical requests.

1.1.2 cause

After verification, it is found that the page contains the following code:

SRC is an empty string. the browser determines that SRC points to the current page. Because the IMG element obtains image data based on SRC, the browser displays the page after the first request, the second same request will be generated when it is parsed here.

In development, it is still common that SRC is temporarily empty. When the server receives the same request multiple times, you can check whether this is the reason.

1.1.3 Solution

Make sure that the SRC of IMG is not empty.

The browser refreshes the page and sends two requests to the server.