405 method not allowed Web API

Question

This error is very common, and I tried all of the solutions and non of them worked. I have disabled WebDAV publishing in control panel and added this to my web config file:<

Answer 1

I'm late to this party but as nothing above was either viable or working in most cases, here is how this was finally resolved for me.

On the server the site/service was hosted on, a feature was required! HTTP ACTIVATION!!!

Server Manager > Manage > Add Roles and Features > next next next till you get to Features > Under .NET (each version) tick HTTP Activation. Also note there is one hidden under >net > WCF Services.

This then worked instantly! That was melting my brain