Facebook Engineer?

This function is available as IO\request_error() in Facebook's www repository.

Return the error output handle for the current request

namespace HH\Lib\IO;

function request_error(): ?CloseableWriteHandle;

This is usually only available for CLI scripts; it will return null in most other contexts, including HTTP requests.

For a throwing version, use request_error(x).

In CLI mode, this is usually the process STDERR.


  • ?CloseableWriteHandle