Dot character '.' in MVC Web API 2 for request such as api/people/STAFF.45287

Following setting in your web.config file should fix your issue:

<configuration>
    <system.webServer>
        <modules runAllManagedModulesForAllRequests="true" />

Suffix the URL with a slash e.g. http://somedomain.com/api/people/staff.33311/ instead of http://somedomain.com/api/people/staff.33311.