Go语言教程之边写边学：如何处理HTTP客户端缓存

package main

import (
    "net/http"
    "time"
)

func main() {
    client := &http.Client{}

    // 创建http请求并设置缓存信息req, _ := http.NewRequest("GET", "http://example.com", nil)
    req.Header.Set("If-Modified-Since", time.Now().UTC().Format(http.TimeFormat))
    req.Header.Set("If-None-Match", "etag")

    // Send the HTTP request
    res, _ := client.Do(req)

    // 处理response
    if res.StatusCode == http.StatusNotModified {
        // 资源没有改变，复用即可
    } else {
        // 为缓存或发生更改，需要处理
    }
}

package main

import (
    "fmt"
    "io/ioutil"
    "net/http"
    "time"

    "github.com/gregjones/httpcache"
    "github.com/gregjones/httpcache/diskcache"
)

func main() {
    // Create a new disk cache with a maximum size of 100MB and a TTL of 1 hour
    cache := diskcache.New("cache")
    cache.MaxSize(100 * 1024 * 1024)
    cache.TTL(time.Hour)

    // Create a new HTTP transport with caching enabled
    transport := httpcache.NewTransport(cache)
    client := &http.Client{Transport: transport}

    // Send a GET request to the HTTP server
    req, _ := http.NewRequest("GET", "http://localhost:8080", nil)
    res, err := client.Do(req)
    if err != nil {
        fmt.Println(err)
        return
    }
    defer res.Body.Close()

    // Read the response body
    body, _ := ioutil.ReadAll(res.Body)
    fmt.Println(string(body))
}