Forum Discussion

devd4n's avatar
devd4n
Icon for Altostratus rankAltostratus
Jul 25, 2023

F5 XC | Rewrite Redirect functionality

Hi together, for the migration to F5 XC we need to change the location header for certain responses (301,302) to match the hostname of the XC instance. Is there currently a way to configure a r...
Nikoolayy1's avatar
Nikoolayy1
Icon for MVP rankMVP

How about trying the Route option in XC:

 

 

 

devd4n's avatar
devd4n
Icon for Altostratus rankAltostratus
Aug 29, 2023
Spoiler
 

Hi Nikoolayy1,

thank you for the hint. Unfortunately this setting only overwrites the host header. I.e. if the target/application server sends a 302 redirect back to itself and not to the FQDN/IP of the XC, the subsequent request is not routed via the XC, but a direct connect to the corresponding target server is performed.

-------------------------------------------------------------------------------------
Example:

FQDN-XC: www[.]test.ves.io
FQDN destination: www[.]test.de

REQUEST www[.]test.ves.io/redirect/uri => XC => www[.]test.de/redirect/uri
RESPONSE 302 - Location: www[.]test.de/destination/uri => XC

===> At this moment XC have to rewrite the Location header to it's own FQDN (Location: www[.]test.ves.io/destination/uri)

-------------------------------------------------------------------------------------

The only particular solution i found is to send all redirects directly for defined uris, but that is not usefull in all cases.

  • Nikoolayy1's avatar
    Nikoolayy1
    Icon for MVP rankMVP
    Aug 29, 2023

    Yup, I have seen this as for example if the origin pool is google.com then the google servers will send a redirect as the site is www.google.com, so I see the only way is for the XC routes to directly send traffic to the origin FQDN that is the final destination, so that a redirect to not be triggered.

     

    Outside of that in the origin pool setting or the XC route you can change the SNI or host value, so the origin pool FQDN to be one thing but the Host/SNI to have another value.

     

    But yes if there was a feature to change the response headers in the HTTP redirect response like the location one.