How to set a custom header using @aws-sdk/client-s3?-CodePudding

Cloudflare's R2 has an extension that prevents a NoSuchBucket error, by creating the bucket if it does not exist. To enable it, you're supposed to add a cf-create-bucket-if-missing: true header on the PutObject request. Can this header be set if we're using the @aws-sdk/client-s3 npm package? If so, how?

If the answer is no, is there an alternative workaround that you would recommend?

If it helps, I'm creating a backend nestjs API, and would like to include this header in outgoing requests.

CodePudding user response：

The AWS SDK v2 allows you to modify requests via Middleware.

Here’s an example of adding a custom header using middleware:

const client = new S3({ region: "us-east-1" });

client.middlewareStack.add(
  (next, context) => (args) => {
    args.request.headers["cf-create-bucket-if-missing"] = "true";
    return next(args);
  },
  {
    step: "serialize",
  }
);

const params = {}; // TODO: fill in usual PutObject params

await client.PutObject(params);

There's a good article that dives into the middleware stack here.