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What would cause Firefox to request a resource multiple times after a long running script?

krevels
krevels
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I'm noticing some unusual behavior in Firefox when I include an image directly after a call to an external script which is long-running.

For example: 

    <html>
    <body>
    
    <script type="text/javascript" src='external.js'></script>
    <img src="/test.gif" BORDER=0 WIDTH=1 HEIGHT=1 >
    
    </body>
    </html>


Contents of external.js: 

    for(i=0; i<999999; i++){ ; }


I notice that when a request to test.gif results in a 404 or 302, Firefox makes another request for that same resource immediately after the 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 for inline javascript, and I have pipelining turned off, so I'm fairly certain it's not related to that. Seems like odd behavior, or I'm just missing something not-so-obvious. Any ideas?

I'm noticing some unusual behavior in Firefox when I include an image directly after a call to an external script which is long-running. For example: <pre><nowiki> <html> <body> <script type="text/javascript" src='external.js'></script> <img src="/test.gif" BORDER=0 WIDTH=1 HEIGHT=1 > </body> </html> </nowiki></pre> <br /> Contents of external.js: <pre><nowiki> for(i=0; i<999999; i++){ ; } </nowiki></pre> <br /> I notice that when a request to test.gif results in a 404 or 302, Firefox makes another request for that same resource immediately after the 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 for inline javascript, and I have pipelining turned off, so I'm fairly certain it's not related to that. Seems like odd behavior, or I'm just missing something not-so-obvious. Any ideas?

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jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 25 Contributor
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