Forum Discussion
Brandon_11574
Nimbostratus
NimbostratusRewrite Rule
I am needing to do a URL Rewrite where a visitor requests http://domain.com/newFolder/ but they actually see the content from http://domain.com/oldFolder/
So when they request http://domain.com/newFolder/page1.html the address bar of their browser doesn't change, but they actually see the contents of http://domain.com/oldFolder/page1.html.
I need the rule to be able to do this for any page or image on the site, like the following examples:
http://domain.com/newFolder/page2.html <- http://domain.com/oldFolder/page2.html
http://domain.com/newFolder/image1.gif <- http://domain.com/oldFolder/image1.gif
http://domain.com/newFolder/about/index.html <- http://domain.com/oldFolder/about/index.html
http://domain.com/newFolder/images/image2.gif <- http://domain.com/oldFolder/images/image2.gif
How do you go about doing this in iRules? Any documentation on this specific type of iRule?
Thanks in advance,
Brandon Petersen
6 Replies
hoolioCirrostratus
Hi Brandon,
You can use Kirk's ProxyPass iRule for this:
http://devcentral.f5.com/wiki/default.aspx/iRules/proxypassv10
http://devcentral.f5.com/wiki/default.aspx/iRules/proxypass (v9)
Aaron
Michael_YatesHere is another option that is a little lighter:
This should change the path on the request going to the server and mask it in the client browser.when HTTP_REQUEST { switch -glob [ string tolower [HTTP::uri] ] { "/oldFolder/*" { HTTP::uri [ string map {"oldFolder" "newFolder"} [HTTP::uri] ] } } }
Let me know if you have any problems wth it.- hoolioIf the app responds with /oldFolder/ in the path, you'd also want to rewrite it to /newFolder/ in redirects and response content. You can do this using using HTTP::is_redirect and a stream profile and STREAM::expression.
http://devcentral.f5.com/wiki/default.aspx/iRules/stream
http://devcentral.f5.com/wiki/default.aspx/iRules/http__is_redirect
Aaron 
Brandon_11574Thanks Michael,
That code worked the way I needed. It is now rewriting the pages. I did notice one issue. We're using SharePoint and it doesn't seem to handle 302 redirectsl. For example, when you go to the page http://domain.com/oldFolder/ the SharePoint server wants to 302 redirect to http://domain.com/oldFolder/pages/default.aspx. It doesn't seem to like that transition.
Otherwise it is displaying pages and images correctly as long as there isn't a 302 redirect being performed by the SharePoint Server.- Brandon_11574Now I'm onto replacing all instances of /oldFolder/ with /newFolder/ in the page content, does this look right?
when HTTP_REQUEST {
switch -glob [ string tolower [HTTP::uri] ] {
"/newFolder/*" {
HTTP::uri [ string map {"newFolder" "oldFolder"} [HTTP::uri] ]
set urlRewrite 1
}
}
}
when HTTP_RESPONSE_DATA {
rewrite the franchise number back to the name in server response
if { $urlRewrite == 1 } {
regsub -all "/Find" [HTTP::payload] "/ReplaceWith" newdata
regsub -all "/368" [HTTP::payload] "/515" newdata
set clen [HTTP::payload length]
HTTP::payload replace 0 $clen $newdata
HTTP::release
}
} - hoolioHi Brandon,
If it's just the URI in requests and response redirects, you can use something like this:when HTTP_REQUEST { Check the requested URI set to lowercase switch -glob [string tolower [HTTP::uri]] { "/newfolder/*" { set find "newfolder" set replace "oldfolder" HTTP::uri [ string map -nocase "$find $replace" [HTTP::uri]] } } } when HTTP_RESPONSE { Check if response is a redirect if {[HTTP::is_redirect] and [HTTP::header Location] contains $find}{ Rewrite the redirect Location header value HTTP::header replace Location [string map -nocase "$find $replace" [HTTP::header Location]] } Check if response payload type is text if {[HTTP::header value Content-Type] contains "text"}{ Set the replacement strings STREAM::expression "@$find@$replace@" Enable the stream filter for this response only STREAM::enable } }
If you need to rewrite response content as well, you can add a blank stream profile, a custom HTTP profile with response chunking set to rechunk and this iRule:when HTTP_REQUEST { Track whether to rewrite responses set rewrite 0 Check the requested URI set to lowercase switch -glob [string tolower [HTTP::uri]] { "/newfolder/*" { set find "newfolder" set replace "oldfolder" HTTP::uri [ string map -nocase "$find $replace" [HTTP::uri]] set rewrite 1 } } } when HTTP_RESPONSE { if {$rewrite}{ Check if response is a redirect if {[HTTP::is_redirect] and [HTTP::header Location] contains $find}{ Rewrite the redirect Location header value HTTP::header replace Location [string map -nocase "$find $replace" [HTTP::header Location]] } Check if response payload type is text if {[HTTP::header value Content-Type] contains "text"}{ Set the replacement strings STREAM::expression "@$find@$replace@" Enable the stream filter for this response only STREAM::enable } } }
Aaron
