src-reading

$ go version go version go1.20.5 darwin/arm64 DefaultTransport 看一下 DefaultTransport 的 RoundTrip 方法。 1// src/net/http/roundtrip.go#L8 2// RoundTrip implements the RoundTripper interface. 3// 4// For higher-level HTTP client support (such as handling of cookies 5// and redirects), see Get, Post, and the Client type. 6// 7// Like the RoundTripper interface, the error types returned 8// by RoundTrip are unspecified. 9func (t *Transport) RoundTrip(req *Request) (*Response, error) { 10 return t.roundTrip(req) 11} 12 13// src/net/http/transport....

$ go version go version go1.20.5 darwin/arm64 如果一个文件一个文件挨着看未免也太枯燥了，并且没有和实践结合，感觉看了也体会不深。这里从发起一个请求到最后收到应答的整个流程，跟随一个 http.Request 的生命周期去探索相关的源码。 http.Client 开始发请求之前先看一下 http.Client 结构体 1// src/net/http/client.go#L29 2// A Client is an HTTP client. Its zero value (DefaultClient) is a 3// usable client that uses DefaultTransport. 4// 5// The Client's Transport typically has internal state (cached TCP 6// connections), so Clients should be reused instead of created as 7// needed. Clients are safe for concurrent use by multiple goroutines. 8// 9// A Client is higher-level than a RoundTripper (such as Transport) 10// and additionally handles HTTP details such as cookies and 11// redirects....