Forum Discussion
NimbostratusIRule - 11.6 HF4 User-Header and redirect to original page.
I am trying to write a custom iRule to perform the following:
- Display a warning to the end user depending on the browser version they are using
- An example of this, user is on Internet Explorer 8 and a warning message appears to tell them to upgrade or set TLS options. A user on Internet Explorer 11 wouldn't get the same message.
- The above would apply to other browser type/versions as well.
- When the message is displayed it will then allow them to continue to the original page.
So user connects to "https://workwebsite.com" and when they use a browser I want to warn them about they get a "custom HTML" page and then the F5 continues to load "https://workwebsite.com" as per normal
After some reading on DevCentral etc. an iRule seems to be the best way to go from here. I don't really want to have to touch the APM policy I have in place (if it can be avoided). This is the iRule that I have constructed so far (with some bits and pieces from around DevCentral and others). I want this message to appear constantly (for now). This iRule as it stands doesn't do anything with the cookie as it still does the redirect. If I put in my website (it basically loops - i.e. it processes, shows the message, redirects to the website and shows the message, over and over and over).
** iRule **
when RULE_INIT { set static::refresh_time 60 set static::notification_page { Browser Notification http://workwebsite.com">
Browser Notification
You are using an unsupported browser.
It is a requirement when accessing our systems to use the latest and greatest
This message will close in 15 seconds
} }
when HTTP_REQUEST { switch -glob [ string tolower [HTTP::header User-Agent]] { "msie 11.0" - "msie 10.0" - "msie 9.0" - "msie 8.0" - "msie 7.0" - "msie 6." { HTTP::respond 200 content [subst $static::notification_page] Mime-Type "text/html" log local0. "Client IP:[IP::client_addr] has been redirected with user agent :[HTTP::header User-Agent]" } "Set-Cookie" "WRONGBROWSER=1; path=/; expires=$expires" default { go to a default location if nothing matches } } }
5 Replies
Will_Adams_1995I noted that msie 11.0 is in the code and this will be removed later. This is more proof of concept.
- Will_Adams_1995
I have played around some more with the iRule and hae it responding to an iFile instead, however I can't (like the above iRule) get it to continue onto the web page. I am stuck in a loop. Here is the update iRule with the iFile.
when HTTP_REQUEST { switch -glob [ string tolower [HTTP::header User-Agent]] { "chrome/40" - "msie 11.0" - "msie 10.0" - "msie 9.0" - "msie 8.0" - "msie 7.0" - "msie 6." { HTTP::respond 200 content [ifile get "us_a_supported_browser_html"] set lookup ==1 log local0. "Client IP:[IP::client_addr] has been redirected with user agent :[HTTP::header User-Agent]" } if {$lookup ==1 } default { go to a default location if nothing matches } } }
- Will_Adams_1995
I have played around some more with the iRule and hae it responding to an iFile instead, however I can't (like the above iRule) get it to continue onto the web page. I am stuck in a loop. Here is the update iRule with the iFile.
when HTTP_REQUEST { switch -glob [ string tolower [HTTP::header User-Agent]] { "chrome/40" - "msie 11.0" - "msie 10.0" - "msie 9.0" - "msie 8.0" - "msie 7.0" - "msie 6." { HTTP::respond 200 content [ifile get "us_a_supported_browser_html"] set lookup ==1 log local0. "Client IP:[IP::client_addr] has been redirected with user agent :[HTTP::header User-Agent]" } if {$lookup ==1 } default { go to a default location if nothing matches } } }
- Kai_Wilke
MVP
Hi Will,
you may try the snippet below. It uses a
cookie to track/check if the user was already informed to update the browser. The warning message will reapper just every 86400 seconds (=1day)...UnsupportedBrowser=truewhen HTTP_REQUEST if { [HTTP::cookie value "UnsupportedBrowser"] eq "" } then { switch -glob -- [string tolower [HTTP::header value "User-Agent"]] { "chrome/40" - "msie 11.0" - "msie 10.0" - "msie 9.0" - "msie 8.0" - "msie 7.0" - "msie 6." { HTTP::respond 200 content [ifile get "us_a_supported_browser_html"] "Set-Cookie" "Unsupported_Browser=true; HttpOnly; Max-Age=86400; Path=/" log local0. "Client IP:[IP::client_addr] has been redirected with user agent :[HTTP::header value "User-Agent"]" } } } else { log local0. "Client IP:[IP::client_addr] has already been redirected with user agent :[HTTP::header value "User-Agent"]" } }Note: You have to rework the
conditions. They are not valid and/or missing some wildcards (-glob User-Agent
) to match just a certain substring.*Cheers, Kai
- Will_Adams_1995
Thanks Kai,
I have had problems implementing the above script and in the end gave up on the iRule. Despite checking what I needed to, the rule simply would not work. I had a moment of inspiration and instead simplified it by using an expression within the APM to do an mcget of session.user.agent and then performing a match for specific key words in the header.
