ProxyPass rule give error

Question

I am using this rule from devcentral.  http://devcentral.f5.com/wiki/default.aspx/iRules/ProxyPass.html 
&nbsp;  
&nbsp; On some of my redirects I get the following error on execution: 
&nbsp;  
&nbsp; TCL error: ProxyPasstestf5.harrisi.net HTTP_RESPONSE - Illegal argument. Cant execute in the current context. line 60 invoked from within HTTP::header $header foreach body line 2 invoked from within foreach header {Location Content-Location URI} { set protocol [substr [HTTP::header $header] 0 $host_serverside] if {$protocol ne ...  
&nbsp;  
&nbsp; How can I troubleshoot to figureout why I am getting this error? 
&nbsp;  
&nbsp;  
&nbsp; Thanks, 
&nbsp;  
&nbsp; Aaron

hooleylist · Answer

Hi Aaron, 
&nbsp;  
&nbsp; Do you have any other iRules added to the virtual server?  Which LTM version are you running?   
&nbsp;  
&nbsp; Aaron

aaron_tebo_7015 · Answer

Yes I have a 404 catch rule in addition to the proxypass rule.  I am running 9.4.3. 
&nbsp;  
&nbsp;  
&nbsp; Thanks, 
&nbsp;  
&nbsp; Aaron

hooleylist · Answer

Can you post that iRule?  I'd guess it's a conflict between the two rules when one is trying to remove a header from an LTM generated response.   
&nbsp;  
&nbsp; Aaron

aaron_tebo_7015 · Answer

Here is the 404 rule:   
 when RULE_INIT {   
 set error_404 {

Page Not Found

[HTTP::status] Error       
    
 Page Not Found   
 The requested URL $HTTP_URI was not found on this server.

}   
 }   
 when HTTP_REQUEST {   
 set HTTP_URI [HTTP::uri]   
 log local0. [HTTP::host]    
 log local0. [HTTP::path]   
 }   
 when HTTP_RESPONSE {   
 log local0. [HTTP::status]    
 log local0. [HTTP::host]    
 if { [HTTP::status] == 404 } {   
 HTTP::respond 404 content [subst $::error_404]   
 }   
 }

hooleylist · Answer

That sounds about right.  You could add a check in the ProxyPass iRule to exit the HTTP_RESPONSE event immediately if the status is a 404.  Something like this should work at the top of the ProxyPass HTTP_RESPONSE event:

when HTTP_RESPONSE { 
  
     Exit this event in this rule if the server response is a 404 as we send a custom response for 404s from another rule 
    if {[HTTP::status] == 404}{ 
  
       return 
    } 
 }

Aaron

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ProxyPass rule give error

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