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Ralph_David_201's avatar
Ralph_David_201
Icon for Nimbostratus rankNimbostratus
Dec 25, 2017

URI to lower case LTM irule issue

Hi Team,

I have a challenge to redirect all uri into lower case. I am able to redirect the URL to lower case but if i type in e.g myweb.net/fR/PAges/DEfauLT.aspx etc it does not redirect to lower case e.g myweb.net/fr/pages/default.aspx. I am trying my best but not sure where actually issue lies. Your help is very much appreciated.

 when HTTP_REQUEST {
 STREAM::disable
HTTP::path [string tolower [HTTP::path]]
 if { [string tolower [HTTP::path]] equals "/" } {
            if { [HTTP::header "Accept-Language"] starts_with "fr" } {
                HTTP::respond 301 -nocase "Location" "https://www.myweb.net/fr/pages/default.aspx" Strict-Transport-Security "max-age=300
                 }

elseif { [HTTP::header "Accept-Language"] starts_with "en" } {

HTTP::respond 301 -nocase "Location" "; Strict-Transport-Security "max-age=300" }

} elseif { [string tolower [HTTP::path]] equals "/autodiscover/autodiscover.xml" } {
    HTTP::respond 301 "Location" "https://autodiscover.myweb.net/autodiscover/autodiscover.xml"

HTTP::redirect "http://[HTTP::host][string tolower [HTTP::path]][HTTP::query]"
} elseif { [string tolower [HTTP::host]] contains "blog.myweb.net" }{
HTTP::respond 301 noserver "Location" "https://www.myweb.net/en/tech/pages/default.aspx" 

} elseif { [string tolower [HTTP::host]] contains "techpage.myweb.net" }{
HTTP::respond 301 noserver "Location" "https://www.myweb.net/en/tech/Pages/techpage.aspx" 
}
}

when HTTP_RESPONSE {
 HTTP::header remove SPRequestGuid

    set cookies [HTTP::cookie names]
    foreach aCookie $cookies {
    HTTP::cookie secure $aCookie enable
    }

if { [HTTP::header exists Location] } {
    HTTP::header remove Server
    HTTP::header replace Location [string map {"http://" "https://"} [string tolower [HTTP::header Location]]]
}

if { [HTTP::header Content-Type] contains "text" } {
   STREAM::expression { @http://s5.mywebnet.net@https://s5.mywebnet.net@ }
    STREAM::enable
}
}
application delivery
ASM Advanced WAF
cloud

12 Replies

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  • nitass_89166's avatar
    nitass_89166
    Icon for Noctilucent rankNoctilucent
    Dec 25, 2017

    I am able to redirect the URL to lower case but if i type in e.g myweb.net/fR/PAges/DEfauLT.aspx etc it does not redirect to lower case e.g myweb.net/fr/pages/default.aspx.

     

    where do you want the redirection to be generated? is it server or bigi-ip?

     

    if it is big-ip, i think myweb.net/fR/PAges/DEfauLT.aspx does not match condition in HTTP_REQUEST event because the outer-if is to check whether request path is equal to root (/).

     

    • Ralph_David_201's avatar
      Ralph_David_201
      Icon for Nimbostratus rankNimbostratus
      Dec 25, 2017

      Thanks nitass for your response. Redirection should be on F5 side for client requests with Upper case URI to Lower case URI.

       

  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Dec 25, 2017

    I am able to redirect the URL to lower case but if i type in e.g myweb.net/fR/PAges/DEfauLT.aspx etc it does not redirect to lower case e.g myweb.net/fr/pages/default.aspx.

     

    where do you want the redirection to be generated? is it server or bigi-ip?

     

    if it is big-ip, i think myweb.net/fR/PAges/DEfauLT.aspx does not match condition in HTTP_REQUEST event because the outer-if is to check whether request path is equal to root (/).

     

    • Ralph_David_201's avatar
      Ralph_David_201
      Icon for Nimbostratus rankNimbostratus
      Dec 25, 2017

      Thanks nitass for your response. Redirection should be on F5 side for client requests with Upper case URI to Lower case URI.

       

  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Dec 25, 2017

    Redirection should be on F5 side for client requests with Upper case URI to Lower case URI.

    e.g.

    // config

[root@ve13a:Active:In Sync] config  tmsh list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:80
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    translate-address enabled
    translate-port enabled
    vs-index 3
}
[root@ve13a:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
when HTTP_REQUEST {
  if { [HTTP::uri] ne [string tolower [HTTP::uri]] } {
    HTTP::respond 301 noserver Location http://[HTTP::host][string tolower [HTTP::uri]]
  }
}
}

// test

[root@ve13a:Active:In Sync] config  curl -I http://172.28.24.10/fR/PAges/DEfauLT.aspx
HTTP/1.0 301 Moved Permanently
Location: http://172.28.24.10/fr/pages/default.aspx
Connection: Keep-Alive
Content-Length: 0

[root@ve13a:Active:In Sync] config  curl -I http://172.28.24.10/fr/pages/default.aspx
HTTP/1.1 404 Not Found
Date: Mon, 25 Dec 2017 08:53:27 GMT
Server: Apache/2.2.3 (CentOS)
Last-Modified: Fri, 15 Apr 2016 03:55:49 GMT
ETag: "418e44-6a-fc825b40"
Accept-Ranges: bytes
Content-Length: 106
Content-Type: text/html; charset=UTF-8
    • Ralph_David_201's avatar
      Ralph_David_201
      Icon for Nimbostratus rankNimbostratus
      Dec 25, 2017

      Awesome nitass.From curl output i see it shows to lowercase but i see in browser URI remains in uppercase instead of redirected to lowercase.

       

    • nitass's avatar
      nitass
      Icon for Employee rankEmployee
      Dec 25, 2017

      you may have to perform further troubleshooting such as tcpdump/ssldump, http analyzer tool or irule logging to see where the problem is.

       

    • Stanislas_Piro2's avatar
      Stanislas_Piro2
      Icon for Cumulonimbus rankCumulonimbus
      Dec 25, 2017

      I always recommend path-relative absolute URLs when destination page is on the same service as the current page:

      when HTTP_REQUEST {
  if { [HTTP::uri] ne [string tolower [HTTP::uri]] } {
    HTTP::respond 301 noserver Location [string tolower [HTTP::uri]]
  }
}

      the problem when working with absolute URLs is when a reverse proxy is configured in front of the server with another hostname or scheme, rewriting is required.

  • nitass_89166's avatar
    nitass_89166
    Icon for Noctilucent rankNoctilucent
    Dec 25, 2017

    Redirection should be on F5 side for client requests with Upper case URI to Lower case URI.

    e.g.

    // config

[root@ve13a:Active:In Sync] config  tmsh list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:80
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    translate-address enabled
    translate-port enabled
    vs-index 3
}
[root@ve13a:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
when HTTP_REQUEST {
  if { [HTTP::uri] ne [string tolower [HTTP::uri]] } {
    HTTP::respond 301 noserver Location http://[HTTP::host][string tolower [HTTP::uri]]
  }
}
}

// test

[root@ve13a:Active:In Sync] config  curl -I http://172.28.24.10/fR/PAges/DEfauLT.aspx
HTTP/1.0 301 Moved Permanently
Location: http://172.28.24.10/fr/pages/default.aspx
Connection: Keep-Alive
Content-Length: 0

[root@ve13a:Active:In Sync] config  curl -I http://172.28.24.10/fr/pages/default.aspx
HTTP/1.1 404 Not Found
Date: Mon, 25 Dec 2017 08:53:27 GMT
Server: Apache/2.2.3 (CentOS)
Last-Modified: Fri, 15 Apr 2016 03:55:49 GMT
ETag: "418e44-6a-fc825b40"
Accept-Ranges: bytes
Content-Length: 106
Content-Type: text/html; charset=UTF-8
    • Ralph_David_201's avatar
      Ralph_David_201
      Icon for Nimbostratus rankNimbostratus
      Dec 25, 2017

      Awesome nitass.From curl output i see it shows to lowercase but i see in browser URI remains in uppercase instead of redirected to lowercase.

       

    • nitass_89166's avatar
      nitass_89166
      Icon for Noctilucent rankNoctilucent
      Dec 25, 2017

      you may have to perform further troubleshooting such as tcpdump/ssldump, http analyzer tool or irule logging to see where the problem is.

       

    • Stanislas_Piro2's avatar
      Stanislas_Piro2
      Icon for Cumulonimbus rankCumulonimbus
      Dec 25, 2017

      I always recommend path-relative absolute URLs when destination page is on the same service as the current page:

      when HTTP_REQUEST {
  if { [HTTP::uri] ne [string tolower [HTTP::uri]] } {
    HTTP::respond 301 noserver Location [string tolower [HTTP::uri]]
  }
}

      the problem when working with absolute URLs is when a reverse proxy is configured in front of the server with another hostname or scheme, rewriting is required.