apache rewrite PT to iRules

Hi,

I think this should be equivalent to the Apache rewrite rule:

when HTTP_REQUEST {
     Check if the host is test.domain.com and the path does not already start with /web/foo
    if {[string tolower [HTTP::host]] eq "test.domain.com"}{
        if { not ([HTTP::path] starts_with "/web/foo")}{
             Prepend /web/foo to the path
            HTTP::path "/web/foo[HTTP::path]"
        }
    }
}

And here's a version which works with a stream profile to rewrite the response content and redirect Location header from /web/foo to nothing:

when HTTP_REQUEST {
     Disable the stream filter by default
    STREAM::disable
     Check if the host is test.domain.com and the path does not already start with /web/foo
    if {[string tolower [HTTP::host]] eq "test.domain.com"}{
        if { not ([HTTP::path] starts_with "/web/foo")}{
             Prepend /web/foo to the path
            HTTP::path "/web/foo[HTTP::path]"
        }
    }
}
when HTTP_RESPONSE {
     Rewrite redirects
    if {[HTTP::is_redirect] && [URI::path [HTTP::header Location]] starts_with "/web/foo"}{
        HTTP::header replace Location [string map {/web/foo ""} [HTTP::header Location]]
    }
     Set the stream expression for text responses
    if {[HTTP::header Content-Length] contains "text"}{
        STREAM::expression {@/web/foo@@}
        STREAM::enable
    }
}

Aaron

Thanks Aaron,

 

 

Almost there...

 

 

1. on your first suggestion, it doesn't seem to get the data from /web/foo on the tomcat server. All it get is the tomcat's default page not the contents from /web/foo

 

 

2. on the stream suggestion, same results as above, my stream profile has this:

 

source: /web/foo

 

target:

 

 

Can you make a successful request from the LTM command line to tomcat using curl to get the content you're expecting?

 

 

curl -v http://1.1.1.1/web/foo/index.html -H "Host: test.domain.com"

 

 

For the response rewriting, does the server have compression or chunking enabled? Can you post an anonymized copy of the curl output?

 

 

Aaron

Here's the snippet of the curl output. Note that 1.1.1.1 is my tomcat server and I haven't enabled the irule you suggested when doing this curl test.

 

 

 

 

 

 

 

curl -v http://1.1.1.1:8181/web/foo/ -H "Host:test.domain.com"

 

* About to connect() to 1.1.1.1 port 8181

 

* Trying 1.1.1.1... connected

 

* Connected to 1.1.1.1 (1.1.1.1) port 8181

 

> GET /web/foo/ HTTP/1.1

 

> User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5

 

> Accept: */*

 

> Host:test.domain.com

 

>

 

< HTTP/1.1 200 OK

 

< Server: Apache-Coyote/1.1

 

< Set-Cookie: JSESSIONID=4E2DBF9A596207D8C8B8DD6E6664E8BC; Path=/web/; HttpOnly

 

< Content-Type: text/html;charset=UTF-8

 

< Transfer-Encoding: chunked

 

< Date: Tue, 17 Jan 2012 20:27:50 GMT

 

% Total % Received % Xferd Average Speed Time Time Time Current

 

Dload Upload Total Spent Left Speed

 

100 1207 0 1207 0 0 66714 0 --:--:-- --:--:-- --:--:-- 66714

 

100 18384 0 18384 0 0 887k 0 --:--:-- --:-

 

-:-- --:--:-- 8387k* Connection 0 to host 1.1.1.1 left intact

 

It shouldn't be a problem rewriting chunked responses. If you had the server sending compressed responses you'd need to uncompressed them or reconfigure the server to not use compression. But that response isn't compressed.

 

 

As far as the request URI rewriting, did that curl request return the content you were expecting? If so, can you compare the server logs for the request made via the VIP and iRule with the one direct to the server from the LTM command line?

 

 

Aaron