// to minimize allocations and copies.
func (b *Reader) collectFragments(delim byte) (fullBuffers [][]byte, finalFragment []byte, totalLen int, err error) {
	var frag []byte
	// Use ReadSlice to look for delim, accumulating full buffers.
	for {
		var e error
		frag, e = b.ReadSlice(delim)
		if e == nil { // got final fragment
			break
		}
		if e != ErrBufferFull { // unexpected error
			err = e

# CL 76540043 net/http: add BasicAuth method to *http.Request, Kelsey Hightower <******@****.***>
pkg net/http, method (*Request) BasicAuth() (string, string, bool)

# CL 137940043 net/http: add Transport.DialTLS hook, Brad Fitzpatrick <******@****.***>
pkg net/http, type Transport struct, DialTLS func(string, string) (net.Conn, error)