WriterProxy is a proxy around an http.ResponseWriter that allows you to hook into various parts of the response process.
type WriterProxy interface {
http.ResponseWriter
// Status returns the HTTP status of the request, or 0 if one has not
// yet been sent.
Status() int
// BytesWritten returns the total number of bytes sent to the client.
BytesWritten() int
// Tee causes the response body to be written to the given io.Writer in
// addition to proxying the writes through. Only one io.Writer can be
// tee'd to at once: setting a second one will overwrite the first.
// Writes will be sent to the proxy before being written to this
// io.Writer. It is illegal for the tee'd writer to be modified
// concurrently with writes.
Tee(io.Writer)
// Unwrap returns the original proxied target.
Unwrap() http.ResponseWriter
}
func WrapWriter(w http.ResponseWriter) WriterProxy
WrapWriter wraps an http.ResponseWriter, returning a proxy that allows you to hook into various parts of the response process.