Chrome CORB blocking APIGateway lambda request

Question

What works

I have a simple word game I've built. It works great. One thing users have requested is a word validity check. I am running the oxford dictionary api on an AWS Lambda Proxy/Node.js end-point, which works great when I access the APIGateway uri via the browser.

I chose an AWS Lambda function in order to protect my Oxford API key, and have more direct CORS control.

Steps taken

I have enabled CORS in the AWS APIGateway, and using a "*" wildcard during development.

I started to code the addition to the game, using my local server, @ 127.0.0.1.

Error encountered

I have run into the following issue:

myproject.html:57 Cross-Origin Read Blocking (CORB) blocked cross-origin response https://XXXXXXXXXXX.execute-api.us-east-2.amazonaws.com/prod/dictionary?word=help with MIME type application/json. See https://www.chromestatus.com/feature/5629709824032768 for more details. getWord @ myproject.html:57 (anonymous) @ myproject.html:67

The client code

I am using a simple fetch:

         var base_url = "https://XXXXXXXXXXX.execute-api.us-east-2.amazonaws.com/prod/dictionary?word=";
            getWord = function(word){
               fetch(base_url+word, {
                    headers: {
                        'content-type': 'application/json'
                    },
                    method: 'GET', 
                    mode: 'cors'
               }).then(function(response) {
                    console.log(response);
               });
            }

The question

I have never heard of CORB. I don't understand what is triggering CORB, and what the steps are to resolve this. How are CORB issues resolved?

Answer 1

I had similar issue. I suggest using POSTMAN for debugging it as it shows headers and allows you to tweak whatever is needed in your request.

In my case I had to re-deploy my API after adding the header. Attaching screenshot in case it might be of help to some users:

Integration response:

Method response:

Postman's headers response - working: