Hello F5 community, Is there a way to add www in front of the URL while keeping the URL intact? For example: https://abc.com/testfolder/blahblahblah changed to https://WWW.abc.com/testfolder/blahblahblah.. Thanks.

Do you want to change Host header sent from the client in server side connection or do you want to redirect the client to https://WWW.abc.com/testfolder/blahblahblah to redirect the client, use following code when HTTP_REQUEST { if {[HTTP::host] eq "abc.com"} { HTTP::redirect "https://www.abc.com[HTTP::uri]" } }

Probably a description of the problem you are trying to solve would help here.

Depends what you want.. if you expicitly what to replace "abc.com" with "www.abc.com" you can use this iRule.when HTTP_REQUEST { if {[HTTP::host] eq "abc.com"} { HTTP::header replace "Host" "www.abc.com" } }If you want to add "www" to any host that doesn't have "www" then that's a different request, so a bit more context would be helpful. Lee

I don't know the full details, but what I was told from our web developers, is that this is related to an SSO authentication between the client and us. Client host a site on their end which the user authenticate to, then they click on a link on the page that takes them to a URL we host (let's say we host abc.com). So the minute the user clicks on the link, it'll send a request for https://abc.com/blahblahappenduserID (it'll append a unique ID or info to the URL) but the SSO authentication is failing, because it needs to be https://WWW.abc.com/blahblahappenduserID. I'm trying to figure out a way to add the www for the incoming request without changing the URL. Hope that makes sense.

I tried this irule and it didn't work, because when I try to hit abc.com/blahblahbalhID, nothing happened.

Hi Lee, please see my response above of what I'm trying to accomplish.

iRule to add www without changing URL

17 Replies

JG
Cumulonimbus
Jul 04, 2019
Probably a description of the problem you are trying to solve would help here.
- MihirP1129
  Nimbostratus
  Jul 05, 2019
  I don't know the full details, but what I was told from our web developers, is that this is related to an SSO authentication between the client and us. Client host a site on their end which the user authenticate to, then they click on a link on the page that takes them to a URL we host (let's say we host abc.com). So the minute the user clicks on the link, it'll send a request for https://abc.com/blahblahappenduserID (it'll append a unique ID or info to the URL) but the SSO authentication is failing, because it needs to be https://WWW.abc.com/blahblahappenduserID. I'm trying to figure out a way to add the www for the incoming request without changing the URL. Hope that makes sense.
Lee_Sutcliffe
Nacreous
Jul 04, 2019
Depends what you want.. if you expicitly what to replace "abc.com" with "www.abc.com" you can use this iRule.
when HTTP_REQUEST { if {[HTTP::host] eq "abc.com"} { HTTP::header replace "Host" "www.abc.com" } }
If you want to add "www" to any host that doesn't have "www" then that's a different request, so a bit more context would be helpful.
Lee
- MihirP1129
  Nimbostratus
  Jul 05, 2019
  Hi Lee, please see my response above of what I'm trying to accomplish.
  - Lee_Sutcliffe
    Nacreous
    Jul 05, 2019
    Have you tried your code? Reading your description above, it sounds like the iRule you supplied should work. Changing the incoming host header from abc.com to www.abc.com will leave the URi/Path intact
Stanislas_Piro2
Cumulonimbus
Jul 05, 2019
Do you want to change Host header sent from the client in server side connection or do you want to redirect the client to https://WWW.abc.com/testfolder/blahblahblah

to redirect the client, use following code

when HTTP_REQUEST { if {[HTTP::host] eq "abc.com"} { HTTP::redirect "https://www.abc.com[HTTP::uri]" } }
- MihirP1129
  Nimbostratus
  Jul 05, 2019
  I tried this irule and it didn't work, because when I try to hit abc.com/blahblahbalhID, nothing happened.
  - Stanislas_Piro2
    Cumulonimbus
    Jul 05, 2019
    Unlikely! You may have done wrong change to match your real host
MihirP1129
Nimbostratus
Jul 08, 2019
To complicate things even more, I found out that the web developer has a redirect hardcoded in the code for http://abc.com or http://www.abc.com to go to https://www.abc.com/web/default.aspx. I added the redirect iRule (Stanislas Piron) mentioned above to the 443 VS on the F5, and when I test a site https://abc.com/web/default.aspx?frm=test-option3, I get a "Hmm.. can't reach this page" in firefox. It shows Protocol (Pending) and Result (Pending) when do a Network debugging in FF when hitting that site. The redirect in the code has to stay for the site to work properly. I'm not sure how to make this work. Maybe conflicts in multiple redirects? looping?
Stanislas_Piro2
Cumulonimbus
Jul 09, 2019
you can also do the same with LTM Policy:

rule 1 :
conditions :
http-host equals "abc.com"
http-uri path segment equals /
actions
http redirect https://www.abc.com/web/default.aspx
rule 2 :
conditions :
http-host equals "abc.com"
actions
http redirect tcl:https://www.abc.com[HTTP::uri]
- MihirP1129
  Nimbostratus
  Jul 09, 2019
  The order in which the irule was placed on the F5 was the issue. After moving the irule to the bottom of the list, it worked! Thanks everyone!
  - Lee_Sutcliffe
    Nacreous
    Jul 09, 2019
    If you have more than one iRule on a VIP I would seriously recommend using priorities on your events. This way you can control the ordering of your events rather than relating on list ordering which is not ideal.
    https://devcentral.f5.com/s/articles/the101-irules-101-events-amp-priorities
    when HTTP_REQUEST priority 100 { #this event will fire SECOND } when HTTP_REQUEST priority 10 { #this event will fire FIRST }