英文:
golang http server send r.URL.Path over socket
问题
我有一个HTTP服务器，我想使用套接字将r.URL.Path文本发送给客户端。
我得到一个错误：undefined: conn in conn.Write
这是因为conn在另一个函数中定义了。
我尝试过的方法：
package main
import (
"net"
"io"
"net/http"
)
ln, _ := net.Listen("tcp", ":8081")
conn, _ := ln.Accept()
func hello(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, "Hello world!")
conn.Write([]byte(r.URL.Path + "\n")) //这里我尝试发送它
}
func main() {
http.HandleFunc("/", hello)
http.ListenAndServe(":8000", nil)
}
英文:
I have a http server, and I want to send the r.URL.Path text to a client using a socket
I get a error: undefined: conn in conn.Write
This is becauase conn is defined in another function
What I have tried:
package main
import (
"net"
"io"
"net/http"
)
ln, _ := net.Listen("tcp", ":8081")
conn, _ := ln.Accept()
func hello(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, "Hello world!")
conn.Write([]byte(r.URL.Path + "\n")) //Here I'm attemping to send it
}
func main() {
http.HandleFunc("/", hello)
http.ListenAndServe(":8000", nil)
}
答案1
得分: 1
你的问题实际上在于你尝试声明变量的方式。
如果你想让conn在全局范围内可用，请使用var关键字。
package main
import (
"io"
"net/http"
"net"
)
var ln, _ = net.Listen("tcp", ":8081")
var conn, _ = ln.Accept()
func hello(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, "Hello world!")
conn.Write([]byte(r.URL.Path + "\n")) //在这里我试图发送它
}
func main() {
http.HandleFunc("/", hello)
http.ListenAndServe(":8000", nil)
}
英文:
Your problem is actually in the way you try to declare variables.
If you want your conn to be on global scope, use var
package main
import (
"io"
"net/http"
"net"
)
var ln, _ = net.Listen("tcp", ":8081")
var conn, _ = ln.Accept()
func hello(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, "Hello world!")
conn.Write([]byte(r.URL.Path + "\n")) //Here I'm attemping to send it
}
func main() {
http.HandleFunc("/", hello)
http.ListenAndServe(":8000", nil)
}
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