Forum Discussion

Bryan_38092's avatar
Bryan_38092
Icon for Nimbostratus rankNimbostratus
Jun 09, 2015

Create iRule to remove everything after a string found in the URI

Looking for some help, trying to create an iRule to remove everything including a string it finds in the URI. For example, http://www.foobar.com/data/12345=rank&format=XYZ and I want to remove the &format=XYZ so it would be http://www.foobar.com/data/12345=rank

when CLIENT_ACCEPTED {
    set default_pool [LB::server pool]
}

when HTTP_REQUEST {
   set uri [HTTP::uri]
   if { $uri contains "&format=XYZ" } {
      HTTP::uri [string range $uri 11 end]
      pool $default_pool
   }
}
application delivery
devops
iRules
  • nitass_89166's avatar
    nitass_89166
    Jun 10, 2015

    this is just another example.

     configuration

[root@ve11b:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  set uri [HTTP::uri]
  if { $uri contains "format=XYZ" } {
    HTTP::uri [string map {"&format=XYZ" "" "format=XYZ&" "" "format=XYZ" ""} $uri]
  }
  log local0. "Before: $uri After: [HTTP::uri]"
}
}

 /var/log/ltm

[root@ve11b:Active:In Sync] config  tail -f /var/log/ltm
Jun 10 22:03:00 ve11b info tmm[10343]: Rule /Common/qux : Before: /data/ After: /data/
Jun 10 22:03:09 ve11b info tmm[10343]: Rule /Common/qux : Before: /data/12345=rank&format=XYZ After: /data/12345=rank
Jun 10 22:03:17 ve11b info tmm1[10343]: Rule /Common/qux : Before: /data/format=XYZ&12345=rank After: /data/12345=rank
Jun 10 22:03:27 ve11b info tmm[10343]: Rule /Common/qux : Before: /data/test=abc&format=XYZ&12345=rank After: /data/test=abc&12345=rank
  • cjunior's avatar
    cjunior
    Icon for Nacreous rankNacreous
    Jun 09, 2015

    Hi Bryan,

    In my example, I considered that the parameter may be in the beginning, case insensitive

    And I think that the pool statement is useless in that scenario. 
    when HTTP_REQUEST {
    if { [string tolower [HTTP::query]] starts_with "format=xyz" } {
        HTTP::uri ""
    } elseif { [string tolower [HTTP::query]] contains "&format=xyz" } {
        HTTP::uri [string range [HTTP::uri] 0 [expr "[string first "&format=xyz" [string tolower [HTTP::uri]]]-1"]]
    }
    log local0. "[HTTP::uri]" 
}

    I hope it helps you. [ ]

  • nitass_89166's avatar
    nitass_89166
    Icon for Noctilucent rankNoctilucent
    Jun 10, 2015

    this is just another example.

     configuration

[root@ve11b:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  set uri [HTTP::uri]
  if { $uri contains "format=XYZ" } {
    HTTP::uri [string map {"&format=XYZ" "" "format=XYZ&" "" "format=XYZ" ""} $uri]
  }
  log local0. "Before: $uri After: [HTTP::uri]"
}
}

 /var/log/ltm

[root@ve11b:Active:In Sync] config  tail -f /var/log/ltm
Jun 10 22:03:00 ve11b info tmm[10343]: Rule /Common/qux : Before: /data/ After: /data/
Jun 10 22:03:09 ve11b info tmm[10343]: Rule /Common/qux : Before: /data/12345=rank&format=XYZ After: /data/12345=rank
Jun 10 22:03:17 ve11b info tmm1[10343]: Rule /Common/qux : Before: /data/format=XYZ&12345=rank After: /data/12345=rank
Jun 10 22:03:27 ve11b info tmm[10343]: Rule /Common/qux : Before: /data/test=abc&format=XYZ&12345=rank After: /data/test=abc&12345=rank
  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Jun 10, 2015

    this is just another example.

     configuration

[root@ve11b:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  set uri [HTTP::uri]
  if { $uri contains "format=XYZ" } {
    HTTP::uri [string map {"&format=XYZ" "" "format=XYZ&" "" "format=XYZ" ""} $uri]
  }
  log local0. "Before: $uri After: [HTTP::uri]"
}
}

 /var/log/ltm

[root@ve11b:Active:In Sync] config  tail -f /var/log/ltm
Jun 10 22:03:00 ve11b info tmm[10343]: Rule /Common/qux : Before: /data/ After: /data/
Jun 10 22:03:09 ve11b info tmm[10343]: Rule /Common/qux : Before: /data/12345=rank&format=XYZ After: /data/12345=rank
Jun 10 22:03:17 ve11b info tmm1[10343]: Rule /Common/qux : Before: /data/format=XYZ&12345=rank After: /data/12345=rank
Jun 10 22:03:27 ve11b info tmm[10343]: Rule /Common/qux : Before: /data/test=abc&format=XYZ&12345=rank After: /data/test=abc&12345=rank