Answers to frequently asked questions encountered in the golang framework source code

When using the Go framework, common problems and their solutions include: Get the HTTP request body: use the ioutil.ReadAll(r.Body) function. Set HTTP headers: Use the w.Header().Set("Content-Type", "application/json") function. Redirect to another URL: Use the http.Redirect(w, r, "https://example.com", http.StatusTemporaryRedirect) function. Parse JSON requests: Use the json.NewDecoder(r.Body).Decode(&data) function. Generate a JSON response: Use the json.NewEncoder(w).Encode(data) function.

Frequently Asked Questions in Go Framework Source Code

When using the Go Framework, you may encounter some common questions . This article explains these issues and how to resolve them.

1. How to get the body of the HTTP request

func HandleRequest(w http.ResponseWriter, r *http.Request) {
    // 获取请求的正文
    body, err := ioutil.ReadAll(r.Body)
    if err != nil {
        http.Error(w, "Could not read request body", http.StatusBadRequest)
        return
    }

    // 处理请求...
}

2. How to set the HTTP header

func HandleRequest(w http.ResponseWriter, r *http.Request) {
    // 设置 HTTP 标头
    w.Header().Set("Content-Type", "application/json")

    // 处理请求...
}

3. How to redirect to another URL

func HandleRequest(w http.ResponseWriter, r *http.Request) {
    // 重定向到另一个 URL
    http.Redirect(w, r, "https://example.com", http.StatusTemporaryRedirect)

    // 处理请求...
}

4. How to parse a JSON request

func HandleRequest(w http.ResponseWriter, r *http.Request) {
    // 解析 JSON 请求正文
    var data map[string]interface{}
    if err := json.NewDecoder(r.Body).Decode(&data); err != nil {
        http.Error(w, "Could not decode JSON request", http.StatusBadRequest)
        return
    }

    // 处理请求...
}

5. How to generate a JSON response

func HandleRequest(w http.ResponseWriter, r *http.Request) {
    // 生成 JSON 响应
    data := map[string]interface{}{
        "message": "Hello, world!",
    }
    json.NewEncoder(w).Encode(data)

    // 处理请求...
}

Practical Case

The following is a practical case of using the HTTP handler in the Go framework to solve common problems:

package main

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

func HandleRequest(w http.ResponseWriter, r *http.Request) {
    // 获取请求的正文
    body, err := ioutil.ReadAll(r.Body)
    if err != nil {
        http.Error(w, "Could not read request body", http.StatusBadRequest)
        return
    }

    // 解析 JSON 请求正文
    var data map[string]interface{}
    if err := json.NewDecoder(r.Body).Decode(&data); err != nil {
        http.Error(w, "Could not decode JSON request", http.StatusBadRequest)
        return
    }

    // 获取请求中的 "name" 字段
    name := data["name"].(string)

    // 生成 JSON 响应
    response := map[string]interface{}{
        "message": fmt.Sprintf("Hello, %s!", name),
    }
    json.NewEncoder(w).Encode(response)
}

func main() {
    http.HandleFunc("/", HandleRequest)
    http.ListenAndServe(":8080", nil)
}

Using this code, You can create a Go HTTP handler that receives a JSON request, gets the "name" field from the request, and generates a JSON response containing a hello message.

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