Reason:

The WebDAVModule set PUT and DELETE request methods disabled by default and due to that PUT and DELETE throw 405 errors.

Solution:

To make the PUT and DELETE requests work, we need to override the WebDAVModule setting in web.config file by adding the below settings under the system.webServer.

<system.webServer>
  <modules runAllManagedModulesForAllRequests="false">
    <remove name="WebDAVModule" />
  </modules>
</system.webServer>

There may be 2 web.config files in your project, if that is the case then update the one that is inside the wwwroot folder.

Also with the latest version of .Net CORE (2.0 and above), there might be a case of no web.config file available at all, if that is your case then add a web.config file on your own.

Note:

If you are facing the same issue with multiple APIs hosted on the same server, then either you can add the above entries under web.config file of all the affected API’s or you can remove the below entry of WebDAVModule from ApplicationHost.config file under the module section:

<add name="WebDAVModule" />

ApplicationHost.config can be found at

C:\Windows\System32\inetsrv\config

Hope that helps !!!

Originally published at http://diary-techies.blogspot.com on
January 07, 2019.