英文:
How to tackle Cors issue on local system?
问题
我正在开发一个非常基本的 Web 应用程序，其中服务器运行在 localhost:12345，客户端运行在 localhost:3000。我这样做是因为我写了一个实际的应用程序，在生产环境中存在跨域问题。所以我开始从基础开始解决这个问题。但是我失败了。我的后端是用 Go 编写的。这是第一个 HTML 页面：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>This is page1</title>
</head>
<body>
Hi this is page1
<a href="index2.html" id='link'>About this web app</a>
</body>
</html>
这是第二个 HTML 页面：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript" src='jquery.js'>
</script>
</head>
<body>
This is page2
</body>
<script type="text/javascript">
$.ajax({
type: 'GET',
url: 'http://localhost:12345/people',
contentType: 'application/json',
success: function(response){
alert(response);
},
error: function(err){
alert(JSON.stringify(err));
}
})
</script>
</html>
最后是后端代码：
package main
import (
"encoding/json"
"log"
"net/http"
"fmt"
"github.com/gorilla/mux"
"github.com/gorilla/handlers"
)
type Person struct {
ID string `json:"id,omitempty"`
Firstname string `json:"firstname,omitempty"`
Lastname string `json:"lastname,omitempty"`
Address *Address `json:"address,omitempty"`
}
type Address struct {
City string `json:"city,omitempty"`
State string `json:"state,omitempty"`
}
var people []Person
func GetPersonEndpoint(w http.ResponseWriter, req *http.Request) {
params := mux.Vars(req)
for _, item := range people {
if item.ID == params["id"] {
json.NewEncoder(w).Encode(item)
return
}
}
json.NewEncoder(w).Encode(&Person{})
}
func GetPeopleEndpoint(w http.ResponseWriter, req *http.Request) {
json.NewEncoder(w).Encode(people)
}
func CreatePersonEndpoint(w http.ResponseWriter, req *http.Request) {
params := mux.Vars(req)
var person Person
_ = json.NewDecoder(req.Body).Decode(&person)
person.ID = params["id"]
people = append(people, person)
json.NewEncoder(w).Encode(people)
}
func DeletePersonEndpoint(w http.ResponseWriter, req *http.Request) {
params := mux.Vars(req)
for index, item := range people {
if item.ID == params["id"] {
people = append(people[:index], people[index+1:]...)
break
}
}
json.NewEncoder(w).Encode(people)
}
func main() {
router := mux.NewRouter()
people = append(people, Person{ID: "1", Firstname: "Nic", Lastname: "Raboy", Address: &Address{City: "Dublin", State: "CA"}})
people = append(people, Person{ID: "2", Firstname: "Maria", Lastname: "Raboy"})
fmt.Println( people);
router.HandleFunc("/people", GetPeopleEndpoint).Methods("GET")
router.HandleFunc("/people/{id}", GetPersonEndpoint).Methods("GET")
router.HandleFunc("/people/{id}", CreatePersonEndpoint).Methods("POST")
router.HandleFunc("/people/{id}", DeletePersonEndpoint).Methods("DELETE")
headersOk := handlers.AllowedHeaders([]string{"X-Requested-With"})
originsOk := handlers.AllowedOrigins([]string{os.Getenv("ORIGIN_ALLOWED")})
methodsOk := handlers.AllowedMethods([]string{"GET", "HEAD", "POST", "PUT", "OPTIONS"})
// start server listen
// with error handling
log.Fatal(http.ListenAndServe(":" + os.Getenv("PORT"), handlers.CORS(originsOk, headersOk, methodsOk)(router)))
}
以上是你提供的内容的翻译。
英文:
I'm working on very basic web app where the server is running on localhost:12345 and client runs on localhost:3000. I'm doing this because, I wrote an actual app and there is cors issue in the production. So I started to drill down to the basic and fix the issue. But I failed. My backend is in 'go'. Here is the 1st html:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>This is page1</title>
</head>
<body>
Hi this is page1
<a href="index2.html" id='link'>About this web app</a>
</body>
</html>
Here is the second html:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript" src='jquery.js'>
</script>
</head>
<body>
This is page2
</body>
<script type="text/javascript">
$.ajax({
type: 'GET',
url: 'http://localhost:12345/people',
contentType: 'application/json',
success: function(response){
alert(response);
},
error: function(err){
alert(JSON.stringify(err));
}
})
</script>
</html>
And finally the backend code:
package main
import (
"encoding/json"
"log"
"net/http"
"fmt"
"github.com/gorilla/mux"
"github.com/gorilla/handlers"
)
type Person struct {
ID string `json:"id,omitempty"`
Firstname string `json:"firstname,omitempty"`
Lastname string `json:"lastname,omitempty"`
Address *Address `json:"address,omitempty"`
}
type Address struct {
City string `json:"city,omitempty"`
State string `json:"state,omitempty"`
}
var people []Person
func GetPersonEndpoint(w http.ResponseWriter, req *http.Request) {
params := mux.Vars(req)
for _, item := range people {
if item.ID == params["id"] {
json.NewEncoder(w).Encode(item)
return
}
}
json.NewEncoder(w).Encode(&Person{})
}
func GetPeopleEndpoint(w http.ResponseWriter, req *http.Request) {
json.NewEncoder(w).Encode(people)
}
func CreatePersonEndpoint(w http.ResponseWriter, req *http.Request) {
params := mux.Vars(req)
var person Person
_ = json.NewDecoder(req.Body).Decode(&person)
person.ID = params["id"]
people = append(people, person)
json.NewEncoder(w).Encode(people)
}
func DeletePersonEndpoint(w http.ResponseWriter, req *http.Request) {
params := mux.Vars(req)
for index, item := range people {
if item.ID == params["id"] {
people = append(people[:index], people[index+1:]...)
break
}
}
json.NewEncoder(w).Encode(people)
}
func main() {
router := mux.NewRouter()
people = append(people, Person{ID: "1", Firstname: "Nic", Lastname: "Raboy", Address: &Address{City: "Dublin", State: "CA"}})
people = append(people, Person{ID: "2", Firstname: "Maria", Lastname: "Raboy"})
fmt.Println( people);
router.HandleFunc("/people", GetPeopleEndpoint).Methods("GET")
router.HandleFunc("/people/{id}", GetPersonEndpoint).Methods("GET")
router.HandleFunc("/people/{id}", CreatePersonEndpoint).Methods("POST")
router.HandleFunc("/people/{id}", DeletePersonEndpoint).Methods("DELETE")
headersOk := handlers.AllowedHeaders([]string{"X-Requested-With"})
originsOk := handlers.AllowedOrigins([]string{os.Getenv("ORIGIN_ALLOWED")})
methodsOk := handlers.AllowedMethods([]string{"GET", "HEAD", "POST", "PUT", "OPTIONS"})
// start server listen
// with error handling
log.Fatal(http.ListenAndServe(":" + os.Getenv("PORT"), handlers.CORS(originsOk, headersOk, methodsOk)(router)))
}
答案1
得分: 1
好的，以下是翻译好的内容：
好的，上述问题的解决方案在此链接中：Go Cors Handler。它可以解决这个问题。
英文:
Ok, The solution for above problem is at this link Go Cors Handler. It does the trick.
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