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DELETE or PUT not working with ASP.Net WebAPI

This is one of common issue one may face while working with Web API, there can be certain reasons due to which DELETE or PUT method not working with Web API. Here I’ll try to include three possible issues and there fixes:

Possible issues and solution:

Issue 1:
Error: HTTP Error 405.0 - Method Not Allowed The page you are looking for cannot be displayed because an invalid method (HTTP Verb) is being used

You are facing this issue because your application is not able to handles all types of HTTP requests. In order to execute HTTP requests for DELETE, PUT, etc., we need to add the below mentioned line in web.config file under <system.webServer>

<modules runallmanagedmodulesforallrequests="true">

Issue 2:
Error: Getting 404 for PUT and DELETE request:  Issue may be due to because Web API provides default GET, POST, PUT and DELETE methods but IIS restricts it. To fix the issue you need to manage the handler mappings in IIS and then need to add PUT and DELETE on the “Verbs” tab. check this post for solution of this issue

Issue 3:
Issue with “content-type: text/plain” (posted string parameter value is NULL): If you are posting data with “content-type: text/plain” to a Web API method that takes a string, you notice that the value in the string is null, this is because of your application not having support for the media type “text/plain”. You can fix the issue by creating custom MediaTypeFormatter in your application and then register your custom MediaTypeFormatter on Application_Start method in your Global.asax.cs file. Brian explained this solution here.

I hope that’ll solve your problem J
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