Error 405 : ASP.NET Core Web API PUT and DELETE Methods not allowed

Recently, while working with .Net core API I came across the issue of “Error 405 — Methods not Allowed”

After some research, I found out that both GET and POST requests working fine but neither PUT nor DELETE requests working.

Another thing is that the PUT and DELETE request was also working fine on my local machine but failed when we host on our Azure server.

When I explored the issue on the web it led me to the conclusion that WebDAVModule seems to set PUT and DELETE request methods disabled by default and due to that PUT and DELETE throw 405 errors.

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 “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 the entry of WebDAVModule from ApplicationHost.config file under module section:

<add name="WebDAVModule" />

ApplicationHost.config can be found at “C:\Windows\System32\inetsrv\config”

Originally published at http://diary-techies.blogspot.com on January 7, 2019.