解析REST API响应

Question

I am new to golang. I was writing a program to parse the json response of the API: https://httpbin.org/get. I have used the following code to parse the response:

package main

import (
    "encoding/json"
    "fmt"
    "net/http"
    "os"
)

type Headers struct {
    Close  string `json:"Connection"`
    Accept string `json:"Accept"`
}

type apiResponse struct {
    Header Headers `json:"headers"`
    URL    string  `json:"url"`
}

func main() {
    apiRoot := "https://httpbin.org/get"
    req, err := http.NewRequest("GET", apiRoot, nil)
    if err != nil {
        fmt.Println("Couldn't prepare request")
        os.Exit(1)
    }
    response, err := http.DefaultClient.Do(req)
    if err != nil {
        fmt.Println(err)
        os.Exit(1)
    }
    defer response.Body.Close()
    var responseStruct apiResponse
    err = json.NewDecoder(response.Body).Decode(&responseStruct)
    if err != nil {
        fmt.Println(err)
        os.Exit(1)
    }

    fmt.Printf("%v
", responseStruct)
}

When I run this code the output is:

$ go run parse.go
{{close } https://httpbin.org/get}

From the output, as we can see the "Accept" key in json response is not decoded. Why is it so? How can I parse that string from response body?

Answer 1

Your code is doing well but here I think your Accept key does not return from API that's why it's not showing the Accept value. To check the key, value pair of your struct, use the below print method.

fmt.Printf("%+v
", responseStruct)

To overcome from this situation you need to send Accept with request into header before request the API like:

req.Header.Set("Accept", "value")
response, err := hc.Do(req)
if err != nil {
    fmt.Println(err)
    os.Exit(1)
}

Then you will get the Accept value in decoded struct as :

{Header:{Accept:value Close:close} URL:https://httpbin.org/get}