http.errors实现

[johncming]

https://caddyserver.com/docs/errors

[johncming]

// ErrorHandler handles HTTP errors (and errors from other middleware).
type ErrorHandler struct {
    Next             httpserver.Handler
    GenericErrorPage string         // default error page filename
    ErrorPages       map[int]string // map of status code to filename
    Log              *httpserver.Logger
    Debug            bool // if true, errors are written out to client rather than to a log
}