web API build with wordpress is showing error of
First of all, clone the website using the All In One WP Migration to your local development machine. Then, check the REST API, if the same error persists. It means you have some error in your code. In my case, the REST API works perfectly fine in my local machine but shows the same HTTP 409 conflict. I contacted with the Bluehost support. They told me they have some mod_security issues. After 2 3 days, they fixed it. It worked fine after that.