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

nitass_89166
Noctilucent
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
  Nimbostratus
  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
Employee
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
  Nimbostratus
  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

Employee

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
Nimbostratus
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
Employee
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
Cumulonimbus
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

Noctilucent

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
Nimbostratus
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
Noctilucent
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
Cumulonimbus
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.

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URI to lower case LTM irule issue

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