go http transfer.go学习

type transferWriter struct {
    Method           string
    Body             io.Reade
    BodyCloser       io.Close
    ResponseToHEAD   bool
    ContentLength    int64 // -1 means unknown, 0 means exactly none
    Close            bool
    TransferEncoding []string
    Trailer          Heade
    IsResponse       bool
}

type transferReader struct {
    // Input
    Header        Heade
    StatusCode    int
    RequestMethod string
    ProtoMajor    int
    ProtoMinor    int
    // Output
    Body             io.ReadClose
    ContentLength    int64
    TransferEncoding []string
    Close            bool
    Trailer          Heade
}

type body struct {
    src          io.Reade
    hdr          interface{}   // non-nil (Response or Request) value means read traile
    r            *bufio.Reader // underlying wire-format reader for the traile
    closing      bool          // is the connection to be closed after reading body?
    doEarlyClose bool          // whether Close should stop early

    mu         sync.Mutex // guards following, and calls to Read and Close
    sawEOF     bool
    closed     bool
    earlyClose bool   // Close called and we didn't read to the end of src
    onHitEOF   func() // if non-nil, func to call when EOF is Read
}