go - CORS golang 回显框架

Question

我有下一个 Go 代码：

package main

import (
  "database/sql"
  "encoding/json"
  "fmt"
  "net/http"

  _ "github.com/go-sql-driver/mysql"
  "github.com/labstack/echo"
  "github.com/labstack/echo/middleware"
)

func main() {
  // Echo instance
  e := echo.New()

  // Middleware
  e.Use(middleware.Logger())
  e.Use(middleware.Recover())
  e.Use(middleware.CORS())
  e.POST("/createuser", addUser)
  e.Logger.Fatal(e.Start(":4000"))
}

和 Vue js 获取脚本

const res = await fetch('https://localhost:4000/createuser', {
    method: 'POST',
    headers: {
      'Content-type': 'application/json',
      'Access-Control-Allow-Origin': '*',
    },
    body: JSON.stringify(nameAndPhone),
  })

执行时我的 Firefox 控制台中的错误

Extraneous request blocked: Single source policy denies reading remote resource at https://localhost:4000/createuser (Reason: Failed to complete CORS request).
Uncaught (in promise) TypeError: NetworkError when attempting to fetch resource.

我的网络标签：

Blocked OPTIONS localhost:4000 createuser fetch CORS failed          0byte
Blocked POST    localhost:4000 createuser fetch NS_ERROR_DOM_BAD_URI 0byte

它在 Postman 中工作，但由于 CORS 而不能在浏览器中工作。如果我的代码中已经有，为什么它不起作用e.Use(middleware.CORS())？

Answer 1

请按照下一个示例进行操作。

e := echo.New()
    e.Use(middleware.CORSWithConfig(middleware.CORSConfig{
      AllowOrigins: []string{"*"},
      AllowHeaders: []string{echo.HeaderOrigin, echo.HeaderContentType, echo.HeaderAccept},
    }))  

Answer 2

问题是我是https从而不是http

固定的js：

const res = await fetch('http://localhost:4000/createdebter', {
        method: 'POST',
        headers: {
          'Accept': 'application/json',
          'Content-type': 'application/json',
        },
        body: JSON.stringify(nameAndPhone),
      })