如何在 Go 中使用 application/x-www-form-urlencoded content-type 执行 GET 请求?

How to perform a GET request with application/x-www-form-urlencoded content-type in Go?

基本上,我需要在 Go 中实现以下方法 - https://api.slack.com/methods/users.lookupByEmail

我试过这样做:

import (
    "bytes"
    "encoding/json"
    "errors"
    "io/ioutil"
    "net/http"
)

type Payload struct {
    Email string `json:"email,omitempty"` 
}

// assume the following code is inside some function

client := &http.Client{}
payload := Payload{
    Email: "octocat@github.com",
}

body, err := json.Marshal(payload)
if err != nil {
    return "", err
}

req, err := http.NewRequest("GET", "https://slack.com/api/users.lookupByEmail", bytes.NewReader(body))
if err != nil {
    return "", err
}

req.Header.Add("Authorization", "Bearer "+token)
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")

resp, err := client.Do(req)
if err != nil {
    return "", err
}

defer resp.Body.Close()
if resp.StatusCode != 200 {
    t, _ := ioutil.ReadAll(resp.Body)
    return "", errors.New(string(t))
}

responseData, err := ioutil.ReadAll(resp.Body)
if err != nil {
    return "", err
}

return string(responseData), nil

但我得到一个错误,指出“电子邮件”字段丢失,这是显而易见的,因为此 content-type 不支持 JSON 有效负载: {"ok":false,"error":"invalid_arguments","response_metadata":{"messages":["[ERROR] missing required field: email"]}} (type: string)

我找不到如何在 GET 请求中包含 post 表单 - http.NewRequest 和 [=25= 都没有可用的 post 表单参数]; http.Client.PostForm 发出 POST 请求,但在这种情况下需要 GET。另外,我想我必须在这里使用 http.NewRequest (除非存在另一种方法)因为我需要设置授权 header.

你误解了application/x-www-form-urlencodedheader,你应该在这里传递一个URL参数。查看示例:

import (
  ...
  "net/url"
  ...
)

data := url.Values{}
data.Set("email", "foo@bar.com")
data.Set("token", "SOME_TOKEN_GOES_HERE")


r, _ := http.NewRequest("GET", "https://slack.com/api/users.lookupByEmail", strings.NewReader(data.Encode()))
r.Header.Add("Content-Type", "application/x-www-form-urlencoded")
r.Header.Add("Content-Length", strconv.Itoa(len(data.Encode())))