1. 模拟 HTTP 上游服务器不响应 (网关 504 超时)
以下 Go 程序作为源站
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package main
import (
"bufio"
"fmt"
"net"
"os"
)
func handleConnection(c net.Conn) {
fmt.Printf("Serving %s\n", c.RemoteAddr().String())
for {
_, err := bufio.NewReader(c).ReadString('\n')
if err != nil {
fmt.Println(err)
return
}
}
c.Close()
}
func main() {
arguments := os.Args
if len(arguments) == 1 {
fmt.Println("Please provide a port number!")
return
}
PORT := ":" + arguments[1]
l, err := net.Listen("tcp4", PORT)
if err != nil {
fmt.Println(err)
return
}
defer l.Close()
for {
c, err := l.Accept()
if err != nil {
fmt.Println(err)
return
}
go handleConnection(c)
}
}
nginx 配置
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location /http_504 {
proxy_connect_timeout 1s;
proxy_read_timeout 3s;
proxy_pass http://127.0.0.1:9999;
}
2. 模拟上游服务器发送不完整的 HTTP 头部，网关（502）
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package main
import (
"bufio"
"fmt"
"net"
"os"
"time"
)
func handleConnection(c net.Conn) {
fmt.Printf("Serving %s\n", c.RemoteAddr().String())
reader := bufio.NewReader(c)
for {
line, err := reader.ReadString('\n')
if err != nil {
fmt.Println(err)
return
}
if line == "\r\n" {
break
}
}
resp := "HTTP/1.1 200 OK\r\n" +
"Date: Tue, 24 Oct 2023 13:13:05 GMT\r\n" +
"Content-Type: text/css\r\n" +
"Content-Length: 31022\r\n" +
"Connection: keep-alive\r\n" +
"Server: openresty+\r\n" +
"Req-ID: 000000800004577246e8004b\r\n" +
"Accept-Ranges: bytes\r\n"
c.Write([]byte(resp))
time.Sleep(time.Second)
c.Close()
}
func main() {
arguments := os.Args
if len(arguments) == 1 {
fmt.Println("Please provide a port number!")
return
}
PORT := ":" + arguments[1]
l, err := net.Listen("tcp4", PORT)
if err != nil {
fmt.Println(err)
return
}
defer l.Close()
for {
c, err := l.Accept()
if err != nil {
fmt.Println(err)
return
}
go handleConnection(c)
}
}
nginx 配置
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location /http_502 {
proxy_connect_timeout 1s;
proxy_read_timeout 3s;
proxy_pass http://127.0.0.1:9998;
}
3. 模拟客户的提前断开连接
以下 Go 程序作为客户的
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package main
import (
"net"
"os"
"fmt"
"time"
)
func main() {
arguments := os.Args
if len(arguments) == 1 {
fmt.Println("Please provide a port number!")
return
}
servAddr := arguments[1]
tcpAddr, err := net.ResolveTCPAddr("tcp", servAddr)
if err != nil {
println("ResolveTCPAddr failed:", err.Error())
os.Exit(1)
}
conn, err := net.DialTCP("tcp", nil, tcpAddr)
if err != nil {
println("Dial failed:", err.Error())
os.Exit(1)
}
reqdata := "GET /http_499 HTTP/1.1\r\nHost: test.com\r\nUser-Agent: curl/7.76.1\r\nAccept: */*\r\n\r\n"
_, err = conn.Write([]byte(reqdata))
if err != nil {
println("Write to server failed:", err.Error())
os.Exit(1)
}
println("write to server = ", reqdata)
time.Sleep(time.Second * 1)
conn.Close()
}
nginx 配置
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location /http_499 {
lua_check_client_abort on;
content_by_lua_block {
ngx.sleep(2)
ngx.say("Hello world")
}
}
4. 模拟 HTTP 服务器，返回指定的文件
以下 Go 程序作为源站
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package main
import (
"fmt"
"io/ioutil"
"net"
"os"
)
func main() {
arguments := os.Args
if len(arguments) != 3 {
fmt.Printf("usage: %s addr file", arguments[0])
return
}
servAddr := arguments[1]
file := arguments[2]
l, err := net.Listen("tcp", servAddr)
if err != nil {
fmt.Println("Error listening:", err.Error())
os.Exit(1)
}
defer l.Close()
fmt.Println("Listening on " + servAddr)
for {
conn, err := l.Accept()
if err != nil {
fmt.Println("Error accepting: ", err.Error())
os.Exit(1)
}
go handleRequest(conn, file)
}
}
// Handles incoming requests.
func handleRequest(conn net.Conn, file string) {
buf := make([]byte, 1024)
_, err := conn.Read(buf)
if err != nil {
fmt.Println("Error reading:", err.Error())
}
content, err := ioutil.ReadFile(file)
if err != nil {
fmt.Println("读取文件时发生错误：", err)
return
}
conn.Write(content)
conn.Close()
}
