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Forum Discussion

trx's avatar
trx
Nov 06, 2010

404 status issue

Hello All,

I'm curious as this is weird behavior I've encountered with this set of code:

 

 

 

when HTTP_RESPONSE {

 

if { ([HTTP::status] equals "404") } {

 

if a 404 is return, then do a 301 redirect to our custom 404 page

 

HTTP::respond 301 Location "http:[HTTP::host]/portal/site/erp/404/"

 

return

 

}

 

}

 

 

 

 

 

 

 

Problem: If the page returns a 200 but there is a missing image, the redirect will take place. I was under the impression that the whole page has to returned 404 before to set the "HTTP::status" to true. Is that correct or am I missing something?

 

 

 

Any clarification is fully appreciated.

 

 

 

Thanks.

 

 

 

Regards,

 

TX

 

application delivery
dev
devops
iRules

3 Replies

  • Chris_Miller's avatar
    Chris_Miller
    Icon for Altostratus rankAltostratus
    Nov 07, 2010
    A page is merely a collection of objects for which HTTP GET requests must be made. If for instance a page had 12 images, a 404 for any of them could trigger the rule. Also, HTTP::host shouldn't be used in HTTP_RESPONSE since there's no host header. You'll want to set a variable from HTTP_REQUEST and check the variable from HTTP_RESPONSE.

    Something like this would work: 

    
when HTTP_REQUEST {
  set hostvar [HTTP::host] } }

when HTTP_RESPONSE {
   if { [HTTP::status] eq "404" } {
  if a 404 is returned, send a 301 redirect for our custom 404 page
    HTTP::respond 301 Location "http://$hostvar/portal/site/erp/404/" } }

    Let me know if you have any issues with that.
  • trx's avatar
    trx
    Nov 08, 2010
    Hello ,

     

    I understand, but what if condition would be used if you're just interested if the page it's self is rendered? Meaning we can ignore the x images that are missing as long as the page is found and renders to the browser.

     

     

    Please let me know.

     

     

    Thanks in advance.

     

     

    Regards,

     

    TX
  • hoolio's avatar
    hoolio
    Icon for Cirrostratus rankCirrostratus
    Nov 09, 2010
    TX,

     

     

    I didn't think the browser would follow a redirect if the 30x response came for an element within the page. Can you use a browser plugin like HttpFox for Firefox or Fidder to see exactly what's triggering the change of the page?

     

     

    Aaron