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http.Transport类型

http.Transport结构的定义可以在源代码https://golang.org/src/net/http/transport.go中找到,如下所示:

type Transport struct {
    idleMu sync.Mutex
    wantIdle bool
    idleConn map[connectMethodKey][]*persistConn
    idleConnCh map[connectMethodKey]chan *persistConn
    idleLRU connLRU
    reqMu sync.Mutex
    reqCanceler map[*Request]func(error)
    altMu sync.Mutex
    altProto atomic.Value
    Proxy func(*Request) (*url.URL, error)
    DialContext func(ctx context.Context, network, addr string) (net.Conn, error)
    Dial func(network, addr string) (net.Conn, error)
    DialTLS func(network, addr string) (net.Conn, error)
    TLSClientConfig *tls.Config
    TLSHandshakeTimeout time.Duration
    DisableKeepAlives bool
    DisableCompression bool
    MaxIdleConns int
    MaxIdleConnsPerHost int
    IdleConnTimeout time.Duration
    ResponseHeaderTimeout time.Duration
    ExpectContinueTimeout time.Duration
    TLSNextProto map[string]func(authority string, c *tls.Conn) RoundTripper
    ProxyConnectHeader Header
    MaxResponseHeaderBytes int64
    nextProtoOnce sync.Once
    h2transport *http2Transport
}

如您所见,http.Transport是一个包含大量字段的复杂结构。好消息是在编写HTTP相关程序时,并不需要经常使用http.Transport结构,并且在使用时不需要处理它的所有字段。

http.Transport结构实现了http.RoundTripper接口,并且支持HTTP、HTTPS和HTTP代理的模式。不过http.Transport是一个低级别的结构,本章中使用的http.Client结构则是一个高级别的HTTP客户端实现。

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