MVC :: State Server / Cookieless - Error 310
Dec 23, 2010
For a project (ASP.NET MVC 2 web application) we needed to use cookieless sessions. Furthermore, we use the ASP.NET State service, because the application is hosted on 21 web servers and we need to be able to share the session state. So the default InProc setting is not an option. Actually we enabled the ASP.NET State service on all of the web servers. The application's configuration file contains a custom configuration section which contains a list of the state servers. For example:
[Code]....
We created a class which descends from the sessionIdManager class. Our session id manager uses the session id generated by the base class and prefixes it with two numbers (00, 01, 02...etc). This number represents the index of one of the state servers displayed in the above list. We pseudo-randomly pick one of the state servers in order to balance the load accross the servers. Then we implemented the
IPartitionResolver interface. Our resolver does the following:
Read our custom session idExtract the index which we appended (e.g. 01)Retrieve the information of the state server from the configuration file (192.168.0.102:42424) the state server information (IP & Port) is used to inform ASP.NET where the ASP.NET State server for this session is located. This setup works fine if we work with exactly one state server (e.g. development environment). It also works fine on our acceptance environment (2 state servers). But after we did a test by enabling 21 state servers and deploying the application on 21 web servers things went wrong. Sometimes the site would function correctly, but now and then we receive an 310 error. The browser informed us that the web page has resulted in too many redirects.
We created a new blank ASP.NET MVC site and implemented this custom session management and voila .... reproducable. Monitoring the traffic with Fiddler gave the following results:
A 302 status is returned containing the same location but a different session id: k heb met Fiddler de HTTP trafiek gemonitord en hetgeen ik tot hiertoe heb ontdekt, is dat er bij een request een status 302 wordt teruggeven met daarin dezelfde location maar andere sessionId.Voorbeeld
Response:HTTP/1.1 302 Found
Server: ASP.NET Development Server/10.0.0.0
Date: Thu, 23 Dec 2010 09:11:31 GMT
X-AspNet-Version: 4.0.30319
Location: /(S(17zprjcofc030gl3ph4lfqaklx))/
Cache-Control: private
Content-Type: text/html; charset=utf-8
Content-Length: 150
Connection: Close
<html><head><title>Object moved</title></head><body>
<h2>Object moved to <a href="/(S(17zprjcofc030gl3ph4lfqaklx))/">here</a>.</h2>
</body></html>
this redirect keeps happening, each time with a different session id until a session id is generated that points to the web server which is also handling the ASP.NET request. Then the page will be shown.
Request: /(S(00cq1vtfyxsvfwxx2lply2zlma))/
Response:
HTTP/1.1 302 Found
Server: ASP.NET Development Server/10.0.0.
Date: Thu, 23 Dec 2010 09:13:13 GMT
X-AspNet-Version: 4.0.30319
Location: /(S(00qbn3zut5mzek3fd4pq5pqt3a))/
Cache-Control: privat
Content-Type: text/html; charset=utf-8
Content-Length: 150
Connection: Clos
<html><head><title>Object moved</title></head><body>
<h2>Object moved to <a href="/(S(00qbn3zut5mzek3fd4pq5pqt3a))/">here</a>.</h2>
</body></html>
New request: /(S(00qbn3zut5mzek3fd4pq5pqt3a))
Response:
TTP/1.1 200 OK
Server: ASP.NET Development Server/10.0.0.
Date: Thu, 23 Dec 2010 09:13:13 GMT
X-AspNet-Version: 4.0.30319
X-AspNetMvc-Version: 2.
Cache-Control: private
Content-Type: text/html; charset=utf-8
Content-Length: 1365
Connection: Close
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "[URL]TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="[URL]">
<head><title>
Home Page
</title><link href="Content/Site.css" rel="stylesheet" type="text/css" /></head>
<body>
Thus the chance that a session id for the same server is created is smaller if more state servers are added to the list.
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[Code]....
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