我已經(jīng)為我的 API 文檔實現(xiàn)了 go-swagger，該文檔在我的本地主機上的不同端口上運行，我的應(yīng)用程序在端口 8888 上運行。我已經(jīng)實現(xiàn)了 cors https://github.com/rs/cors我實現(xiàn) cors 的代碼是var Router = func() *mux.Router{ router := mux.NewRouter() var c = cors.New(cors.Options{ AllowedOrigins: []string{"*"}, AllowCredentials: true, AllowedMethods :[]string{"POST", "PUT","GET","DELETE","OPTIONS"}, AllowedHeaders: []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"}, MaxAge: 300, // Enable Debugging for testing, consider disabling in production Debug: true, }) RegisterHandler := http.HandlerFunc(controllers.Register) router.Handle("/api/register",c.Handler(middleware.RequestValidator(RegisterHandler,reflect.TypeOf(dto.UserRequest{})))).Methods("POST") fmt.Println("var1 = ", reflect.TypeOf(router)) return router}當(dāng)從 Postman 發(fā)出請求時，似乎代碼運行良好郵遞員響應(yīng)標(biāo)頭access-control-allow-credentials →trueaccess-control-allow-origin →*content-length →123content-type →application/jsondate →Wed, 14 Oct 2020 04:02:37 GMTvary →Origin 由于我在實現(xiàn)我的控制臺上打印的 cors 中間件日志時啟用了調(diào)試，如下所示控制臺日志[cors] 2020/10/14 09:32:37 Handler: Actual request[cors] 2020/10/14 09:32:37 Actual response added headers: map[Access-Control-Allow-Credentials:[true] Access-Control-Allow-Origin:[*] Vary:[Origin]]問題當(dāng)我在瀏覽器中從 Swagger-UI 訪問相同的 API 時，我遇到了未設(shè)置“Access-Control-Allow-Origin”標(biāo)頭的問題Access to fetch at 'http://localhost:8888/api/register' from origin 'http://localhost:45601' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.并且控制臺上沒有打印日志。從 Swagger UI 訪問 API 時，似乎無法訪問 cors 中間件代碼。這是 swagger 響應(yīng)的 Bowser 網(wǎng)絡(luò)調(diào)用詳細(xì)信息
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TA貢獻(xiàn)1824條經(jīng)驗 獲得超5個贊
您需要OPTIONS在路由器上允許方法。
https://github.com/abhimanyu1990/go-connect/blob/main/app/conf/router.configuration.go#L30
router.Handle("/api/register", c.Handler(middleware.RequestValidator(RegisterHandler, reflect.TypeOf(dto.UserRequest{})))).Methods("POST", "OPTIONS")
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TA貢獻(xiàn)1891條經(jīng)驗 獲得超3個贊
當(dāng)我嘗試啟用 CORS 并在 Go 中寫入標(biāo)頭時，這很煩人。最后，我創(chuàng)建了一個包裝 ResponseWriter 的結(jié)構(gòu)來檢測標(biāo)頭是否已經(jīng)寫入并且它工作正常。
package router
import (
"log"
"net/http"
)
const (
noWritten = -1
defaultStatus = http.StatusOK
)
type ResponseWriter struct {
writer http.ResponseWriter
size int
status int
}
func (w *ResponseWriter) Writer() http.ResponseWriter {
return w.writer
}
func (w *ResponseWriter) WriteHeader(code int) {
if code > 0 && w.status != code {
if w.Written() {
log.Printf("[WARNING] Headers were already written. Wanted to override status code %d with %d", w.status, code)
}
w.status = code
}
}
func (w *ResponseWriter) WriteHeaderNow() {
if !w.Written() {
w.size = 0
w.writer.WriteHeader(w.status)
}
}
func (w *ResponseWriter) Write(data []byte) (n int, err error) {
w.WriteHeaderNow()
n, err = w.writer.Write(data)
w.size += n
return
}
func (w *ResponseWriter) Status() int {
return w.status
}
func (w *ResponseWriter) Size() int {
return w.size
}
func (w *ResponseWriter) Written() bool {
return w.size != noWritten
}
在回應(yīng)中：
func respondJSON(w *router.ResponseWriter, status int, payload interface{}) {
res, err := json.Marshal(payload)
if err != nil {
respondError(w, internalErrorStatus.number, internalErrorStatus.description)
return
}
go w.WriteHeader(status)
header := w.Writer().Header()
header.Add("Access-Control-Allow-Origin", "*")
header.Add("Content-Type", "application/json")
header.Add("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE")
header.Add("Access-Control-Allow-Headers", "*")
w.Write([]byte(res))
}
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