Forum Discussion

KG's avatar
KG
Icon for Nimbostratus rankNimbostratus
Oct 22, 2019

irule to modify hostname in http request and http response

Hi All,   I have a requirement to modify the hostnames on the LTMs. We have an external app and it's accessed from the Internet. Clinets will use https://xyz.com, but the load balanced servers in i...
application delivery
LTM
Simon_Blakely's avatar
Simon_Blakely
Icon for Employee rankEmployee
Oct 22, 2019

The irule will work correctly for requests - the Host header will be changed correctly.

 

However, you do not need to modify a host header in a response, as Host is a request header and not a response header. What you do need to do is modify any references within the response to correct the host (for example, the Location header in a HTTP 302 Redirect response may contain the hostname). Cookies may also contain a domain attribute that needs to be corrected to ensure that the client returns the cookies appropriately.

 

So using the Rewrite profile is a better approach - otherwise you will probably need to us a STREAM irule to carry out textual substitution of the domain names, which the rewrite profile automates.

 

 

  • KG's avatar
    KG
    Icon for Nimbostratus rankNimbostratus
    Oct 22, 2019

    Thanks Blakely. I will try using the rewrite profile. So, can I still use the iRule for requests and use the rewrite profile for responses. Or do you recommend using rewrite profile for both requests and responses. Thanks again.