func writeHeader(w xo.Writer, fields Fields) error {
for _, f := range fields {
buf, err := w.Reserve(len(f.Name) + len(f.Value) + 4)
if err != nil {
return err
}
n := copy(buf[0:], f.Name)
n += copy(buf[n:], ": ")
n += copy(buf[n:], f.Value)
n += copy(buf[n:], "\r\n")
if err := w.Commit(n); err != nil {
return err
}
}
_, err := w.Write(crlf)
return err
}
// WriteRequestHeader writes an HTTP request header to w.
func WriteRequestHeader(w xo.Writer, req *Request) error {
buf, err := w.Reserve(len(req.Method) + len(req.URI) + 10 + 20 + 20)
if err != nil {
return err
}
n := copy(buf[0:], req.Method)
n += copy(buf[n:], " ")
n += copy(buf[n:], req.URI)
n += copy(buf[n:], " HTTP/")
n += itoa(buf[n:], int64(req.Major))
n += copy(buf[n:], ".")
n += itoa(buf[n:], int64(req.Minor))
n += copy(buf[n:], "\r\n")
if err := w.Commit(n); err != nil {
return err
}
return writeHeader(w, req.Fields)
}