ReasonPhrase

ReasonPhrase is a textual indicator of the status of an HTTP request. It accompanies the numeric status code in the response line of an HTTP response. While the status code provides a standardized, machine-readable representation of the outcome, the ReasonPhrase offers a human-readable explanation. For example, a status code of 200 is typically accompanied by the ReasonPhrase "OK", indicating that the request has succeeded. Similarly, a 404 status code is usually paired with "Not Found".

The Hypertext Transfer Protocol (HTTP) specification defines standard ReasonPhrases for common status codes. However, servers are permitted to use custom ReasonPhrases, though this is generally discouraged for interoperability reasons. The ReasonPhrase is intended to be a brief, descriptive summary and is not meant to convey detailed error information. Clients are expected to rely on the status code for programmatic handling of responses. The ReasonPhrase is primarily for informational purposes for developers or for display in user interfaces.