Forum Discussion

Julian_Grunnell's avatar
Julian_Grunnell
Icon for Nimbostratus rankNimbostratus
Sep 12, 2008

HTTPS to HTTP redirect with HTTP Class

Hi - can someone help out with the above please, got the following scenario.

 

 

HTTP VS

 

HTTPS VS

 

 

1) anyone who goes to http://sitename/ goes to HTTP VS

 

 

2) anyone who goes to http://sitename/contact MUST be redirected to HTTPS VS

 

 

3) anyone who goes https://sitename WITH THE EXCEPTION of the /contact page MUST goto HTTP VS

 

 

 

I've been looking at the HTTP Class profiles as you can do redirects with them, the problem I have is with a simple redirect if you goto https://sitename/contact it goes into a loop and IE just errors, Safari actually tells you it's looping. ALL other pages are fine.

 

 

So I see that you can define URI Paths within the class to match for so I'm trying to add a rule in the HTTPS redirect that says send ALL HTTPS traffic to the HTTP site that DOES NOT match /contact.

 

 

I just don't seem to be able to get the regex right for this - anyone help?

 

 

 

Note: also posted a question about this in the iRules section, but I reckon this will work just as well.

 

 

Thanks - J.
config
design

3 Replies

Sort By
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Sep 12, 2008
    Here is a regex which will match anything not starting with /contact:

     

     

    ^(?!/contact).+$

     

     

    And here is an option for case insensitive matching:

     

     

    (?i)^(?!/contact).+$

     

     

     

    (?i)^(?!/contact).+$

     

     

    Options: ^ and $ match at line breaks

     

     

    Match the remainder of the regex with the options: case insensitive (i) «(?i)»

     

    Assert position at the start of the string or after a line break character «^»

     

    Assert that it is impossible to match the regex below starting at this position (negative lookahead) «(?!/contact)»

     

    Match the characters "/contact" literally «/contact»

     

    Match any single character that is not a line break character «.+»

     

    Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»

     

    Assert position at the end of the string or before a line break character «$»

     

     

     

     

    Aaron
  • Julian_Grunnell's avatar
    Julian_Grunnell
    Icon for Nimbostratus rankNimbostratus
    Sep 12, 2008
    Thanks Aaron - you save the day again!!

     

     

    What was frustrating is the LTM guide states that the LTM's use "ARE / Advanced Regular Expressions" and the examples were very basic. I just couldn't find any decent documentation on "ARE" - saying that I'm no expert on regex at all, so maybe there isn't a great deal of difference?

     

     

    I'll study your very simple response and try to understand exactly what it's doing.

     

     

    Thanks again - J.
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Sep 12, 2008
    Glad it's working for you. Lookaheads and lookbehinds are a bit more advanced than what I'd expect a manual to cover.

     

     

    ASM uses perl compatible regexes (PCRE). I think the HTTP class evaluation is probably done by TMM using the TCL library, but that's an assumption.

     

     

    Aaron