javascript - What would cause Firefox to request a resource multiple times after executing an external script? -


i'm noticing unusual behavior in firefox when include image directly after call external script.

for example:

<html> <body>  <script type="text/javascript" src='external.js'></script> <img src="/test.gif" border=0 width=1 height=1 >  </body> </html>

"external.js" can @ all...even blank.

i notice when request test.gif results in 404 or 302, firefox makes request same resource after script has completed. 

127.0.0.1 - - [29/apr/2011:16:22:22 -0400] "get /test.gif http/1.1" 404 507  127.0.0.1 - - [29/apr/2011:16:22:22 -0400] "get /test.gif http/1.1" 404 507

this behavior doesn't occur inline javascript, , have pipelining turned off, i'm it's not related that. seems odd behavior, or i'm missing not-so-obvious.

i'm using firefox 3.16 on ubuntu, verified firefox 4.0 on osx , firefox 3.16 on windows.

any ideas?

this due image prefetch (or more precisely image cache) in firefox not dealing non-2xx return codes.

in particular, 302 issue https://bugzilla.mozilla.org/show_bug.cgi?id=552605 , 404 issue https://bugzilla.mozilla.org/show_bug.cgi?id=648568


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