Get Proxygen Headers

:::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. :::

Fetch all HTTP request names in the order they were received from proxygen

namespace HH;

function get_proxygen_headers(): vec<(string)>;

Returns

• array - - An array of all the HTTP header names in the current request. Note: if the same header name appears more than once in the request headers sent by client, it will appear more than once in this array.