Forum Discussion

iRule's avatar
iRule
Icon for Cirrus rankCirrus
Mar 08, 2023

replace part of URI for specific URL and pass remaining

Dear Community, I need to replace only specific part of  URI i.e "/abc/defg/" with "/uvw/xyz/"  in a URL. All other URLs should not be altered. "/abc/defg/" will appear in the begning of URI For e...
application delivery
f5
LTM
  • Paulius's avatar
    Paulius
    Mar 14, 2023

    iRule It should be the following and any other additions can be added in a similar manner. You might consider speaking with the application team and have them perform the corrections on the server as this should only be done as a last resort in an iRule.

    when CLIENT_ACCEPTED priority 500 {

    set DEFAULT_POOL [LB::server pool]

}

when HTTP_REQUEST priority 500 {

    if {[string tolower [HTTP::uri]] starts_with "/abc/defg/"} {
        HTTP::uri [string map {"/abc/defg/" "/uvw/xyz/"}[HTTP::uri]]
        pool pool_web
    } elseif {[string tolower [HTTP::uri]] starts_with "/123/456/"} {
        HTTP::uri [string map {"/123/456/" "/78/910/"}[HTTP::uri]]
        pool pool_web
    } elseif{[string tolower [HTTP::uri]] starts_with "/asdf-asdf/"} {
        HTTP::uri [string map {"/asdf-asdf/" "/lkjh-lkjh/"}[HTTP::uri]]
        pool pool_web
    } else {
        pool ${DEFAULT_POOL}
    }

}
iRule's avatar
iRule
Icon for Cirrus rankCirrus
Mar 08, 2023

I tried following iRule but it results in URIs starting with "/abc/defg/" working fine and all other URLs stopped working which are not starting with "/abc/defg/".

 

when HTTP_REQUEST {
if {[HTTP::uri] starts_with "/abc/defg/"} {
HTTP::uri [string map {"/abc/defg/" "/uvw/xyz/"}[HTTP::uri]]
pool pool_web
}
}

 

  • Paulius's avatar
    Paulius
    Icon for MVP rankMVP
    Mar 08, 2023

    iRule I have made some slight modifications to the iRule but I don't think it will resolve your issue but are best practices.

    when HTTP_REQUEST priority 500 {

    if {[string tolower [HTTP::uri]] starts_with "/abc/defg/"} {
        HTTP::uri [string map {"/abc/defg/" "/uvw/xyz/"}[HTTP::uri]]
        pool pool_web
    }

}

    If you can provide additional detail as to what exactly isn't working for the additional URLs we might be able to assist further.

    • iRule's avatar
      iRule
      Icon for Cirrus rankCirrus
      Mar 08, 2023

      Paulius All other URLs that are not starting with "/abc/defg/" are stopped and I am getting connection reset error. Kindly provide an updated iRule.

      • Paulius's avatar
        Paulius
        Icon for MVP rankMVP
        Mar 09, 2023

        iRule Do you have pool configured for the VS that your iRule is configured under? It would be helpful to see the configuration of your VS in order to properly configure an iRule to perform the task that you are expecting.

    • iRule's avatar
      iRule
      Icon for Cirrus rankCirrus
      Mar 12, 2023

      This iRule is under testing and I shall keep you posted on results, Thank you

    • iRule's avatar
      iRule
      Icon for Cirrus rankCirrus
      Mar 13, 2023

      Paulius The iRule provided by you worked fine with Thanks but application team has now enhanced the requirment for us to it achieve from f5 iRule.

      Enhanced requirement is as following

      Replace URI keywords

      FROM: https://bbcc.com/abc/defg/v1/derh/user-cases/profile/morning TO: https://bbcc.com/uvw/xyz/v1/derh/user-cases/profile/morning

      OR

      FROM: https://bbcc.com/123/456/v1/derh/morning/evening/night TO: https://bbcc.com/78/910/v1/derh/morning/evening/night

      OR

      FROM: https://bbcc.com/asdf-asdf/school/college/university TO: https://bbcc.com/lkjh-lkjh/school/college/university

      All Other URLs should not be alerted and sent to pool without modification in URI.

      Please help in achiveing this.

      Regards

       

       

      • Paulius's avatar
        Paulius
        Icon for MVP rankMVP
        Mar 14, 2023

        iRule It should be the following and any other additions can be added in a similar manner. You might consider speaking with the application team and have them perform the corrections on the server as this should only be done as a last resort in an iRule.

        when CLIENT_ACCEPTED priority 500 {

    set DEFAULT_POOL [LB::server pool]

}

when HTTP_REQUEST priority 500 {

    if {[string tolower [HTTP::uri]] starts_with "/abc/defg/"} {
        HTTP::uri [string map {"/abc/defg/" "/uvw/xyz/"}[HTTP::uri]]
        pool pool_web
    } elseif {[string tolower [HTTP::uri]] starts_with "/123/456/"} {
        HTTP::uri [string map {"/123/456/" "/78/910/"}[HTTP::uri]]
        pool pool_web
    } elseif{[string tolower [HTTP::uri]] starts_with "/asdf-asdf/"} {
        HTTP::uri [string map {"/asdf-asdf/" "/lkjh-lkjh/"}[HTTP::uri]]
        pool pool_web
    } else {
        pool ${DEFAULT_POOL}
    }

}