API returns index.ejs HTML template instead of JSON

Question

When trying to bring a news/posts list from a common WordPress RSS Feed (Rest API), it ends up returning my index.ejs webpack template in my app instead of the JSON response.

Using an endpoint like: example.com/wp-json/wp/v2/posts, the expected response would be a JSON "string" with a certain number of posts, and instead it's returning a text/html response, which happens to be the html template for my app, nothing unkown.

The code in JS, React being used is:

import axios from 'axios';

const getPosts = async () => {
  const postsEndpoint = '/wp-json/wp/v2/posts';
  const config = {
    headers: {
      'accept': 'text/html, application/json',
      'Content-Type': 'application/json; charset=UTF-8',
    },
    params: {
      _limit: 5,
    }
  };
  let response;

  try {
    response = await axios.get(postsEndpoint, config);
  } catch (err) {
    console.log(err);
  } finally {
    // eslint-disable-next-line no-unsafe-finally
    return response.json;
  }
};

export default getPosts;

And the code to show this in display:

const blogNews = () => {
  const [isLoading, setIsLoading] = useState(false);
  const [posts, setPosts] = useState(null);

  const getPostsData = async () => {

    try {
      setIsLoading(true);
      const data = await getPosts();
      console.log(data);
      if (data.status === 200) {
        setPosts(data);
        setIsLoading(false);
      }
    } catch (err) {
      console.log(err);
    } finally {
      setIsLoading(false);
    }

  };

  useEffect(() => {
    getPostsData();
  }, []);

return ...  

And the nginx configuration lines looks like this:

location /wp-json/wp/v2/ {
      proxy_pass http://example.com/;
}

I'm using 'text/html' in the Accept header just to see what's in the response, if I only include 'application/json' it just returns a 404 error.

The fact that I'm not including Cors nor CSP headers it's because it's because the policy criteria is being met with the nginx configuration.

Do you guys have any recommendations regarding this? Thanks in advance.