So I have a site – we’ll call www.site1.com that sets a client side cookie named CookieName1 and I need a subdomain test.site1.com to be able to read that value. Using php’s standard setcookie() method I set the cookie on www by using:
setcookie( “CookieName1”, $CookieName1Value, $CookieExpDate, “/”, “.site1.com” );
This works, no problem. Now test.site1.com uses .NET to read in the value and do something. Pretty standard stuff here:
If Request.Cookies(“CookieName1”) IsNot Nothing Then
”DO SOMETHING
End If
Build > Debug, set a breakpoint on the if block, skips right over it. Huh? I make sure IE has the cookie, try again. Nope, Request.Cookies(“CookieName1”) is Nothing. Can’t be an IE thing can it? Run same scenerio in FireFox – same result. Then it dawns on me, I’m not running this under test.site1.com, I’m running this under localhost. Everything was working as expected, cookies can only be read by *.site1.com. So how am I going to test this thing on my local machine? I do have a sandbox, test1sandbox.site1.com, but what if I didn’t? A simple solution is to change the host file found at %SystemRoot%\system32\drivers\etc\ with:
127.0.0.1 localhost
127.0.0.1 test1.site1.com
Run another Debug, change the http://localhost to http://test1.site1.com and now I’m able to read cookies from *.site1.com. Nifty.
Very good tip! I am working with cookies accross sub domains and I know I would have hit this issue. Thanks for the tip!
Just got to the work of using cookies accross subdomains. I came back to get your example, and, it works like a charm!
Thanks for posting this information.
YES BUT … Place a breakpoint somewhere like Global.asax or in a page and check the value in Request.URL
You will find it reads ‘http://localhost:…’ not ‘http://test.localhost:…’ so your results are being returned (and your cookie read) from the domain not the subdomain. This debugging trick works by ‘faking’ the subdomain to be the localhost domain. Any code you have that depends on Request.URL being correct will no longer work.
Is there a better fix for this? I haven’t found one yet!
YES BUT … I found the answer. You need to check the HOST header in the request which has the full domain name (e.g. subdomain.localhost:XXXX) instead of using Request.URL.Authority. To do this I created an extension method in the Uri object which does this check and returns a ‘hacked’ version of the Uri with the correct domain name inserted using Regex. Sorted.
You really make it seem so easy with your presentation but I find this
matter to be actually something that I think I would
never understand. It seems too complicated and very broad for me.
I’m looking forward for your next post, I will try to
get the hang of it!
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