Preflight Checklist

• I have read the [Contributing Guidelines](https://github.com/electro

It might be possible to have a more efficient way to pipe a file to a stream by adding a .stream method to FileHandle.

e.g.

FileHandle.prototype.stream = async function (dst, { start = 0, end, signal } = {}) {
 // TODO: this[kRef](), this[kUnref](), if (signal.aborted) throw AbortError()
  let pos = start
  while (true) {
    if (end && pos >= end) {
      break
    }
  

Meteor makes use of the DDP_DEFAULT_CONNECTION_URL environment variable to modify the __meteor_runtime_config__.DDP_DEFAULT_CONNECTION_URL variable in the server.

__meteor_runtime_config_.DDP_DEFAULT_CONNECTION_URL is then transmitted by the server to the clients in the downloaded index files.

This variable is then used by the client to determine where to make the DDP client connection

Describe the bug
Using xframe ALLOW-FROM throws error in console: Invalid 'X-Frame-Options' header encountered when loading 'https://api.dev.mysite.com/uploads/my-file.pdf': 'ALLOW-FROM dev.mysite.com' is not a recognized directive. The header will be ignored.

https://strapi.io/documentation/v3.x/concepts/middlewares.html#response-middlewares
instructions for xframe indicate `ALLOW-FR

While I try to change header titles by passing array of titles to options like below it does not override the headers. Instead it writes new headers first and original data with old headers again from next cell.

I am experiencing the same problem.

In addition, sheets js is mutating the header array passed in, which is not something I would ever expect.

Example:

const head