wp-includes/class-wp-http-requests-response.php:101Sets a single HTTP header.
$keystring$valuestring$replacebooloptionaltrue public function header( $key, $value, $replace = true ) { if ( $replace ) { unset( $this->response->headers[ $key ] ); } $this->response->headers[ $key ] = $value; }Introduced in 4.6.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-http-requests-response.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.