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Request Error

hphp/hack/manual/hsl/Functions/HH.Lib.IO/request_error.md

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:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

Return the error output handle for the current request

Hack
namespace HH\Lib\IO;

function request_error(): ?CloseableWriteFDHandle;

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_errorx().

In CLI mode, this is usually the process STDERR.

Returns

  • ?CloseableWriteFDHandle
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