Http Put 405 Method Not Allowed Iis

The 405 Error: Cause and Resolution

Introduction

The 405 Method Not Allowed error occurs when a web server is unable to process a request using the specified HTTP verb. This error can occur for a variety of reasons, including:

Incorrect HTTP Verb

The most common cause of the 405 error is using an incorrect HTTP verb to access a resource. For example, if you try to POST to a URL that only accepts GET requests, you will receive a 405 error.

Missing File Extension

When POSTing to a URL without a file extension, such as "example.com/api/create," be sure to include the trailing ".". For example, "example.com/api/create.".

IIS Configuration

In ASPNET Core applications hosted on IIS, the 405 error can be caused by incorrect IIS configuration. Specifically, the "web.config" file may need to be modified to allow the correct HTTP verbs.

Troubleshooting

To troubleshoot the 405 error, you can:

• Check the HTTP verb you are using to access the resource.
• Ensure that the URL has the correct file extension.
• Verify the IIS configuration for ASPNET Core applications.

Conclusion

The 405 Method Not Allowed error is a common error that can be caused by a variety of factors. By understanding the causes and following the troubleshooting steps outlined in this article, you can quickly resolve this error and ensure that your web application is functioning properly.