go的 response 学习

response代表来自http request的响应

先看看response的结构体定义

type Response struct {    Status     string // e.g. "200 OK"    StatusCode int    // e.g. 200    Proto      string // e.g. "HTTP/1.0"    ProtoMajor int    // e.g. 1    ProtoMinor int    // e.g. 0    // Header maps header keys to values.  If the response had multiple    // headers with the same key, they may be concatenated, with comma    // delimiters.  (Section 4.2 of RFC 2616 requires that multiple headers    // be semantically equivalent to a comma-delimited sequence.) Values    // duplicated by other fields in this struct (e.g., ContentLength) are    // omitted from Header.    //    // Keys in the map are canonicalized (see CanonicalHeaderKey).    Header Header    // The http Client and Transport guarantee that Body is always    // non-nil, even on responses without a body or responses with    // a zero-length body. It is the caller's responsibility to    // close Body. The default HTTP client's Transport does not    // attempt to reuse HTTP/1.0 or HTTP/1.1 TCP connections    // ("keep-alive") unless the Body is read to completion and is    // closed.    //    // The Body is automatically dechunked if the server replied    // with a "chunked" Transfer-Encoding.    Body io.ReadCloser  // response body部分 ，读完之后就被关闭     ContentLength int64 // 表示传输的文本长度    // Contains transfer encodings from outer-most to inner-most. Value is    // nil, means that "identity" encoding is used.    TransferEncoding []string    Close bool    // Trailer maps trailer keys to values in the same    // format as Header.    //    // The Trailer initially contains only nil values, one for    // each key specified in the server's "Trailer" header    // value. Those values are not added to Header.    //    // Trailer must not be accessed concurrently with Read calls    // on the Body.    //    // After Body.Read has returned io.EOF, Trailer will contain    // any trailer values sent by the server.    Trailer Header    // The Request that was sent to obtain this Response.    // Request's Body is nil (having already been consumed).    // This is only populated for Client requests.    Request *Request    // TLS contains information about the TLS connection on which the    // response was received. It is nil for unencrypted responses.    // The pointer is shared between responses and should not be    // modified.    TLS *tls.ConnectionState

方法调用

    func Get(url string) (resp *Response, err error)    func Head(url string) (resp *Response, err error)    func Post(url string, bodyType string, body io.Reader) (resp *Response, err error)    func PostForm(url string, data url.Values) (resp *Response, err error)    func ReadResponse(r *bufio.Reader, req *Request) (*Response, error)    func (r *Response) Cookies() []*Cookie    func (r *Response) Location() (*url.URL, error)    func (r *Response) ProtoAtLeast(major, minor int) bool    func (r *Response) Write(w io.Writer) error