Deployment issue: Could not load file or assembly ‘System.Web.Http’

Today I got an exception when deploying an ASP.NET MVC 4 application to our web server. Could not load file or assembly 'System.Web.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified It never happened to me before. The only change I did was small code change and package update. What really confused me was that my application doesn't use System.Web.Http pacakge. I couldn't see it anywhere in the solution, no matter in References or package.config or Web.config. After long time checking of installed packages and assemblies, I used remote access to Web server and checked the bin folder of deployed project, System.Web.Http dll file was actually there and its version was 4.0. The reason i can come up with was that some of the packages i updated had dependency on System.Web.Http. But then the problem was "why can't it be loaded by system?" Inspired by one post related to this issue on StackOverflow, I tried a solution which added assembly redirects in Web.

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This article is related to

Uncategorized,Assembly Redirect,System.Web.Http