英文:
Go: cannot create a server in go routine
问题
尝试在Go协程中使用ListenAndServe时出现错误：
package main
import (
"fmt"
"io/ioutil"
"net/http"
)
func main() {
http.HandleFunc("/static/", myHandler)
go func() {
http.ListenAndServe("localhost:80", nil)
}()
fmt.Printf("we are here")
resp, _ := http.Get("localhost:80/static")
ans, _ := ioutil.ReadAll(resp.Body)
fmt.Printf("response: %s", ans)
}
func myHandler(rw http.ResponseWriter, req *http.Request) {
fmt.Printf(req.URL.Path)
}
错误信息：
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x48 pc=0x401102]
goroutine 1 [running]:
panic(0x6160c0, 0xc0420080a0)
c:/go/src/runtime/panic.go:500 +0x1af
main.main()
C:/gowork/src/exc/14.go:20 +0xc2
exit status 2
我只想创建一个http服务器，并从代码中进行测试和连接。Go出了什么问题？（或者是我的问题？）
英文:
When trying to ListenAndServer inside a go routine I get an error:
package main
import (
"fmt"
"io/ioutil"
"net/http"
)
func main() {
http.HandleFunc("/static/", myHandler)
go func() {
http.ListenAndServe("localhost:80", nil)
}()
fmt.Printf("we are here")
resp, _ := http.Get("localhost:80/static")
ans, _ := ioutil.ReadAll(resp.Body)
fmt.Printf("response: %s", ans)
}
func myHandler(rw http.ResponseWriter, req *http.Request) {
fmt.Printf(req.URL.Path)
}
The error:
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x48 pc=0x401102]
goroutine 1 [running]:
panic(0x6160c0, 0xc0420080a0)
c:/go/src/runtime/panic.go:500 +0x1af
main.main()
C:/gowork/src/exc/14.go:20 +0xc2
exit status 2
All I want is to create an http server. And then test it and connect to it from the code. What's wrong with Go? (or with me?)
答案1
得分: 1
你必须使用（在这种情况下）带有"http://"的方式：
resp, _ := http.Get("http://localhost:80/static")
在使用响应之前，要检查错误，以防请求失败：
resp, err := http.Get("http://localhost:80/static")
if err != nil {
// 处理错误
} else {
ans, _ := ioutil.ReadAll(resp.Body)
fmt.Printf("response: %s", ans)
}
此外，如果你想从处理程序中获取任何响应，你必须在其中编写一个响应：
func myHandler(rw http.ResponseWriter, req *http.Request) {
fmt.Printf(req.URL.Path)
rw.Write([]byte("Hello World!"))
}
英文:
You must use (with "http://" in this case)
resp, _ := http.Get("http://localhost:80/static")
and check the errors before use the response, just in case the request fails
resp, err := http.Get("http://localhost:80/static")
if err != nil {
// do something
} else {
ans, _ := ioutil.ReadAll(resp.Body)
fmt.Printf("response: %s", ans)
}
Also, if you want to get any response from your handler, you have to write a response in it.
func myHandler(rw http.ResponseWriter, req *http.Request) {
fmt.Printf(req.URL.Path)
rw.Write([]byte("Hello World!"))
}
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