How to use the duplicate request processing mechanism in golang

With the continuous development of Internet technology, a large number of API interfaces are widely used in various fields, such as Web development, mobile APP development, Internet of Things, etc. When using API interfaces, programmers often encounter a problem - repeated requests.

Duplicate requests are a common problem in API interface development. For example, when a request fails, the request needs to be resent. However, if repeated requests are not processed, it may burden the server and even cause some interface errors.

In order to avoid these problems, we need to introduce a duplicate request processing mechanism in API interface development. This article will introduce how to use the repeated request processing mechanism in golang.

1. Understand the characteristics of HTTP requests

In golang, we can use the net/http package to send HTTP requests. HTTP requests mainly consist of request method, URL, HTTP header and HTTP request body.

In HTTP requests, each request has a unique identifier - request ID. The request ID can be used to distinguish different requests made by the same client.

2. Methods to solve the problem of duplicate requests

In golang, there are two ways to solve duplicate requests: using timestamps and using unique identifiers.

2.1 Using timestamp

In HTTP requests, we can add a timestamp field to record the sending time of each request. When the server processes an HTTP request, it can first compare the difference between the timestamp of the request and the current time. If it times out, it refuses to process the request. This can effectively avoid repeated requests.

Sample code for using timestamps:

package main

import (
   "fmt"
   "net/http"
   "strconv"
   "time"
)

func sendReq() {
   now := time.Now().Unix()
   // 发送HTTP请求
   url := "http://example.com/api/test"
   resp, err := http.Get(url + "?timestamp=" + strconv.FormatInt(now, 10))
   if err != nil {
      fmt.Println("send request error:", err)
      return
   }

   defer resp.Body.Close()
   // 处理HTTP响应
   // ......
}

2.2 Using unique identifiers

In HTTP requests, we can add a unique identifier field to distinguish different ask. When processing an HTTP request, the server can compare the unique identifier of the request with the unique identifier of the currently processed request. If they are the same, the server refuses to process the request. This can effectively avoid repeated requests.

Sample code using unique identifiers:

package main

import (
   "fmt"
   "net/http"
   "strconv"
   "time"
)

func sendReq() {
   now := time.Now().Unix()
   // 生成唯一标识符
   id := strconv.FormatInt(now, 10) + strconv.Itoa(rand.Intn(10000))
   // 发送HTTP请求
   url := "http://example.com/api/test"
   resp, err := http.Get(url + "?id=" + id)
   if err != nil {
      fmt.Println("send request error:", err)
      return
   }

   defer resp.Body.Close()
   // 处理HTTP响应
   // ......
}

3. Summary

Duplicate requests are a common problem in API interface development, but we can Process HTTP requests to avoid this problem. In golang, we can use two methods: timestamp and unique identifier to solve the problem of repeated requests. Using these methods can make our API interface more stable and reliable, and can also better serve our users.

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