似乎并发 GET，POST 等也有问题

package main

import (
"fmt"
)

func main() {
cs := make(chan *Client, 100)
for i := 0; i < 10; i++ {
go func(i int) {
if i%2 == 1 {
cs <- Get("123")
} else {
cs <- Post("456")
}
}(i)
}
for {
select {
case c := <-cs:
fmt.Println(c.method, c.url)
}
}
}