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Former Member's avatar
Former Member
Jun 27, 2017

Conditionally inject text into HTML responses

Hello,

An LTM needs to inspect a server's response pages and rewrite the HTML so that, for every URL written without a specific URI path, the URI path is inserted.

Example:

Server sends back calls to URL 

http://server.example
/path
/image.jpeg
-- Ok, no action

Server sends back calls to URL 

http://server.example/image.jpeg
-- Need to inject 
/path

I haven't been able to get a working syntax, any help will be immensely appreciated.

application delivery
BIG-IP
check response
html rewrite
LTM
rewrite

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  • cjunior's avatar
    cjunior
    Icon for Nacreous rankNacreous
    Jun 28, 2017

    Hi Rodolfo, I had no lucky with regex exclude "(?!path)", so I would to try this way:

    when HTTP_REQUEST {
      STREAM::disable
      HTTP::header remove "Accept-Encoding"
}
when HTTP_RESPONSE { 
    if { [HTTP::header value Content-Type] contains "text" } {  
         \w{0,4} = 'path' lenght
        STREAM::expression {@server\.example/\w{0,4}@@}
        STREAM::enable
    }
}
when STREAM_MATCHED {
    if { ! ([STREAM::match] ends_with "path") } {
        STREAM::replace [string map {/ /path/} [STREAM::match]]
    }
}

    Regards.