Let's say something like this being captured in the web browser console.

Cross-Origin Read Blocking (CORB) blocked cross-origin response https://api2.amplitude.com/2/httpapi with MIME type application/json. See https://www.chromestatus.com/feature/5629709824032768 for more details.

I once ran into this when submitting a request from web app "a" to web service "b". When I ran into this, the web server was a NodeJS app, and I had to update the NodeJS app to use CORS (Cross-origin resource sharing). I first had to use the npm install command to install the CORS module. 

npm install cors

And then I updated the NodeJS app to import and use CORS.

import cors from 'cors';
app.use(cors());

Additionally, I also updated both web app "a" and web service "b" with header "Access-Control-Allow-Origin": "*".

headers: {
      "Content-Type": "application/json",
      "Access-Control-Allow-Origin": "*"
    }