在带有Golang和Standard Env的Google App Engine上使用urlfetch添加标题的正确方法

问题描述：

I am newer to Go and Google App Engine and I'm trying to build a simple middleware API that queries an external API.

Because I am using the standard env on Google App Engine I have to use urlfetch to create a http request. With Google's documentation, I can't figure out how to add in headers to my GET request - though the documentation clearly states I can add in headers.

https://cloud.google.com/appengine/docs/standard/go/outbound-requests

This is the code I am trying to modify to include a custom request header:

import (
    "fmt"
    "net/http"

    "google.golang.org/appengine"
    "google.golang.org/appengine/urlfetch"
)

func handler(w http.ResponseWriter, r *http.Request) {
        ctx := appengine.NewContext(r)
        client := urlfetch.Client(ctx)
        resp, err := client.Get("https://www.google.com/")
        if err != nil {
                http.Error(w, err.Error(), http.StatusInternalServerError)
                return
        }
        fmt.Fprintf(w, "HTTP GET returned status %v", resp.Status)
}

Any help would be much appreciated.

我是Go和Google App Engine的新手，我正在尝试构建一个简单的中间件API，以查询外部 API。 p>

由于我在Google App Engine上使用标准环境，因此必须使用urlfetch创建一个http请求。使用Google的文档，我无法弄清楚如何在GET请求中添加标头-尽管文档中明确指出可以在标头中添加标头。 p>

https://cloud.google.com/appengine/docs/standard/go/outbound-requests a > p>

这是我要修改的代码，以包括自定义请求标头： p>

  import（
“ fmt” \  n“ net / http” 
 
“ google.golang.org/appengine"
” google.golang.org/appengine/urlfetch"
)

func处理程序（带有http.ResponseWriter，r * http。 请求）{
 ctx：= appengine.NewContext（r）
客户端：= urlfetch.Client（ctx）
 resp，err：= client.Get（“ https://www.google.com/”）\  n如果err！= nil {
 http.Error（w，err.Error（），http.StatusInternalServerError）
 return 
} 
 fmt.Fprintf（w，“ HTTP GET返回状态％v”，分别为。 状态）
} 
  code>  pre> 
 
 任何帮助 将不胜感激。 p> 
  div>

答

Here is a working solution that uses http.NewRequest to add in a header.

func handler(w http.ResponseWriter, r *http.Request) {
    ctx := appengine.NewContext(r)
    client := urlfetch.Client(ctx)

    req, err := http.NewRequest("GET", "https://www.google.com/", nil)
    req.Header.Add("CUSTOM-HEADER", "VALUE")
    if err != nil {
            http.Error(w, err.Error(), http.StatusInternalServerError)
            return
    }

    resp, err := client.Do(req)
    if err != nil {
            http.Error(w, err.Error(), http.StatusInternalServerError)
            return
    }

    fmt.Fprintf(w, "HTTP GET returned status %v", resp.Status)
}

在带有Golang和Standard Env的Google App Engine上使用urlfetch添加标题的正确方法

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