Using URI to rewrite host

Below is my rule, and for HTTP, it is close to working as expected, but for HTTPS via SSL proxy, I am noticing strange behavior. Please see the ltm log snippet from the 2 at the bottom. For some reason, it will attach the "token" twice in front of the host when going via SSL proxy. Any idea why, would this be a bug? I had both VIP configured identically except for the proxy part, using the same rule and pool.

when HTTP_REQUEST {
    set host [HTTP::host]
   log local0. $host
    set uri [HTTP::uri]
    set token [getfield [HTTP::uri] "/" 2] 
    if { $token eq "" } {
      log local0. "no path specified so ignore"
    } else {
      if { [matchclass $uri ends_with $::file_extensions] > 0 } {
        log local0. "Found file request, leave as is!"
        set host "$token.$host"
        HTTP::header replace "host" $host
      } else {
        log local0. "Not a file request, update host and check for trailing slash "
        if { not ( $host starts_with $token ) } {
          set host "$token.$host"
          log local0. "Updated host with token: $host"
          HTTP::header replace "Host" $host
        }
        if { $uri ends_with "/" } {
          log local0. "Uri ends with a slash, all's good"
        } else {
          log local0. "Uri doesn't end with a slash, appending one"
          append uri "/"
          HTTP::uri $uri
        }
      }
    }
    log local0. "host: $host"
    log local0. "uri : $uri"
  }

Log from HTTP LB:

Thu Aug 11 02:14:34 EDT 2005 tmm tmm[739] Rule host_rewrite2 : Not a file request, update host and check for trailing slash

Thu Aug 11 02:14:34 EDT 2005 tmm tmm[739] Rule host_rewrite2 : Updated host with token: aao.cc71.ddc-f5.com

Thu Aug 11 02:14:34 EDT 2005 tmm tmm[739] Rule host_rewrite2 : Uri doesn't end with a slash, appending one

Thu Aug 11 02:14:34 EDT 2005 tmm tmm[739] Rule host_rewrite2 : host: aao.cc71.ddc-f5.com

Thu Aug 11 02:14:34 EDT 2005 tmm tmm[739] Rule host_rewrite2 : uri : /aao/

Thu Aug 11 02:14:35 EDT 2005 tmm tmm[739] Rule host_rewrite2 : Found file request, leave as is!

Thu Aug 11 02:14:35 EDT 2005 tmm tmm[739] Rule host_rewrite2 : host: dmb_i.gif.cc71.ddc-f5.com

Thu Aug 11 02:14:35 EDT 2005 tmm tmm[739] Rule host_rewrite2 : uri : /dmb_i.gif

Thu Aug 11 02:14:35 EDT 2005 tmm tmm[739] Rule host_rewrite2 : Found file request, leave as is!

Thu Aug 11 02:14:35 EDT 2005 tmm tmm[739] Rule host_rewrite2 : host: dmb_m.gif.cc71.ddc-f5.com

Thu Aug 11 02:14:35 EDT 2005 tmm tmm[739] Rule host_rewrite2 : uri : /dmb_m.gif

Thu Aug 11 02:14:35 EDT 2005 tmm tmm[739] Rule host_rewrite2 : Found file request, leave as is!

Thu Aug 11 02:14:35 EDT 2005 tmm tmm[739] Rule host_rewrite2 : host: AAO.cc71.ddc-f5.com

Thu Aug 11 02:14:35 EDT 2005 tmm tmm[739] Rule host_rewrite2 : uri : /AAO/_images/banner_checkbox1.gif

Log from HTTPS via SSL proxy:

Thu Aug 11 02:31:00 EDT 2005 tmm tmm[739] Rule host_rewrite2 : Not a file request, update host and check for trailing slash

Thu Aug 11 02:31:00 EDT 2005 tmm tmm[739] Rule host_rewrite2 : Uri doesn't end with a slash, appending one

Thu Aug 11 02:31:00 EDT 2005 tmm tmm[739] Rule host_rewrite2 : host: aao.cc71.ddc-f5.com

Thu Aug 11 02:31:00 EDT 2005 tmm tmm[739] Rule host_rewrite2 : uri : /aao/

Thu Aug 11 02:31:01 EDT 2005 tmm tmm[739] Rule host_rewrite2 : Found file request, leave as is!

Thu Aug 11 02:31:01 EDT 2005 tmm tmm[739] Rule host_rewrite2 : host: dmb_i.gif.dmb_i.gif.cc71.ddc-f5.com

Thu Aug 11 02:31:01 EDT 2005 tmm tmm[739] Rule host_rewrite2 : uri : /dmb_i.gif

Thu Aug 11 02:31:01 EDT 2005 tmm tmm[739] Rule host_rewrite2 : Found file request, leave as is!

Thu Aug 11 02:31:01 EDT 2005 tmm tmm[739] Rule host_rewrite2 : host: dmb_m.gif.dmb_m.gif.cc71.ddc-f5.com

Thu Aug 11 02:31:01 EDT 2005 tmm tmm[739] Rule host_rewrite2 : uri : /dmb_m.gif

Thu Aug 11 02:31:01 EDT 2005 tmm tmm[739] Rule host_rewrite2 : Found file request, leave as is!

Thu Aug 11 02:31:01 EDT 2005 tmm tmm[739] Rule host_rewrite2 : host: AAO.AAO.cc71.ddc-f5.com

Thu Aug 11 02:31:01 EDT 2005 tmm tmm[739] Rule host_rewrite2 : uri : /AAO/_images/banner_checkbox1.gif

Hmm, about all I can say, is that you have a section of code that is not checking whether the host already contains the token and adding it anyway. Since it seems you always want this in the host, I would hoist that logic to before the check for a image file:

 

when HTTP_REQUEST {
    set host [HTTP::host]
   log local0. $host
    set uri [HTTP::uri]
    set token [getfield [HTTP::uri] "/" 2] 
    if { $token eq "" } {
      log local0. "no path specified so ignore"
    } else {
      if { not ( $host starts_with $token ) } {
        set host "$token.$host"
        log local0. "Updated host with token: $host"
        HTTP::header replace "Host" $host
      }
      if { [matchclass $uri ends_with $::file_extensions] > 0 } {
        log local0. "Found file request, leave as is!"
      } else {
        log local0. "Not a file request, update host and check for trailing slash "
        if { $uri ends_with "/" } {
          log local0. "Uri ends with a slash, all's good"
        } else {
          log local0. "Uri doesn't end with a slash, appending one"
          append uri "/"
          HTTP::uri $uri
        }
      }
    }
    log local0. "host: $host"
    log local0. "uri : $uri"
  }

 

The onyl thing I am really struglling with now is that when I type in the trailing slash, the page displays propery, but if not, then the menu and login buttons do not work. When I look at the log, below entry is the one that is associated with the menu display which is not being processed as I expect it to...........

 

 

 

Thu Aug 11 02:31:01 EDT 2005 tmm tmm[739] Rule host_rewrite2 : host: dmb_i.gif.cc71.ddc-f5.com

 

Thu Aug 11 02:31:01 EDT 2005 tmm tmm[739] Rule host_rewrite2 : uri : /dmb_i.gif

One more try. I've tried to simplify the logic in your code and based off of your requirements:

 

 

www.site.com/dir1 => dir1.www.site.com/dir1/

 

www.site.com/dir1/file.htm => www.site.com/dir1/file.htm

 

www.site.com/dir2/ => dir2.www.site.com/dir2/

 

 

this code should work:

 

 

when HTTP_REQUEST {
  set host [HTTP::host]
  set uri [HTTP::uri]
  set token [getfield [HTTP::uri] "/" 2]
   If no uri is passed in, then leave everything as is
  if { $token ne "" } {
    if { [matchclass $uri ends_with $::file_extensions] > 0 } {
       for case www.site.com/dir1/file.htm => www.site.com/dir1/file.htm
      log local0. "Found file request, leaving host and uri alone"
    } else {
      log local0. "Not a file request, update host and check for trailing slash "
       Check if host starts with token
       If not, then prepend it with the token
      if { ! ($host starts_with $token) } {
         ie. www.site.com/dir1 => dir1.www.site.com/dir1
        log local0. "Host doesn't start with token so updating host"
        set host "$token.$host"
        HTTP::header replace "Host" $host
      }
       Check if url ends with a slash
       if not, then append it with one
      if { ! ($uri ends_with "/") } {
         ie. dir1.www.site.com/dir1 => dir1.www.site.com/dir1/
        log local0. "Uri doesn't end with a slash, updating"
        append uri "/"
        HTTP::uri $uri
      }
    }
  }
  log local0. "host: $host"
  log local0. "uri : $uri"
  log local0. "full: $host$uri"
}

 

 

-Joe

Sorry, mistake on my part on what we are trying to do:

 

 

 

cc71.ddc.com/app1 -> app1.cc71.ddc.com/app1/

 

cc71.ddc.com/app1/ -> app1.cc71.ddc.com/app1/

 

cc71.ddc.com/app1/file.extension -> app1.cc71.ddc.com/app1/file.extension

 

app1.cc71.ddc.com/app1/ -> no change.

 

app1.cc71.ddc.com/app1/file.extension -> no change.

 

 

Also found in the server return that some of the objects are referenced by file name only, so the request is coming from the client as:

 

cc71.ddc.com/file.extension and now we have to turn that into the same format of app1.cc71.ddc.com/app1/file.extension.

 

 

At this point, I am wondering if I will have to have rule for each and every app separately instead of trying to use a generic rule to cover all apps (paths)