http.ListenAndServe流程的第7，8步骤源码

 //http.ListenAndServe流程的第7，8步骤
func (c *conn) serve(ctx context.Context) {
   ...
   serverHandler{c.server}.ServeHTTP(w, w.req)
   ...
}
type serverHandler struct {
    srv *Server
}

func (sh serverHandler) ServeHTTP(rw ResponseWriter, req *Request) {
    handler := sh.srv.Handler
    if handler == nil {
        handler = DefaultServeMux
    }
    if req.RequestURI == "*" && req.Method == "OPTIONS" {
        handler = globalOptionsHandler{}
    }

    if req.URL != nil && strings.Contains(req.URL.RawQuery, ";") {
        var allowQuerySemicolonsInUse int32
        req = req.WithContext(context.WithValue(req.Context(), silenceSemWarnContextKey, func() {
            atomic.StoreInt32(&allowQuerySemicolonsInUse, 1)
        }))
        defer func() {
            if atomic.LoadInt32(&allowQuerySemicolonsInUse) == 0 {
                sh.srv.logf("http: URL query contains semicolon, which is no longer a supported separator; parts of the query may be stripped when parsed; see golang.org/issue/25192")
            }
        }()
    }

    handler.ServeHTTP(rw, req)
}