我使用以下代码来提供 HTML 文件。
func main() {
http.HandleFunc("/", func(rw http.ResponseWriter, r *http.Request) {
path := r.URL.Path
if path == "/" {
path = "index.html"
}
http.ServeFile(rw, r, "./"+path)
})
http.ListenAndServe(":5555", nil)
}
此 HTML 文件包含一个 JavaScript 文件,该文件使用 fetch 来检索一些数据。通过 apache 提供服务时效果很好,但通过 Go-server 提供服务时则不然。
这是获取请求:
const fetchSettings = {
method: "POST",
body: JSON.stringify(requestBody),
headers: {
"Content-Type": "application/json",
}
};
const response = await fetch("https://some.url", fetchSettings);
这是我收到的错误:
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://some.url. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://some.url. (Reason: CORS request did not succeed).
您需要包含 Access-Control-Allow-Origin 标头:
rw.Header().Set("Access-Control-Allow-Origin", "*")
该允许所有来源,您可以在这里阅读更多信息:https://perennialsky.medium.com/handle-cors-in-golang-7c5c3902dc08
以下是它如何适合您的代码:
func main() {
http.HandleFunc("/", func(rw http.ResponseWriter, r *http.Request) {
path := r.URL.Path
if path == "/" {
path = "index.html"
}
rw.Header().Set("Access-Control-Allow-Origin", "*")
http.ServeFile(rw, r, "./"+path)
})
http.ListenAndServe(":5555", nil)
}