The text an error status is reported with: the client's own message, else the reason phrase, else HTTP <status>. HTTP/2 carries no reason phrase, so statusText is empty for any status missing from STATUS_MESSAGES.
HTTP <status>
statusText
The text an error status is reported with: the client's own message, else the reason phrase, else
HTTP <status>. HTTP/2 carries no reason phrase, sostatusTextis empty for any status missing from STATUS_MESSAGES.