reactjs - 'http ://localhost:300 0' has been blocked by CORS policy: No ' Access-Control-Allow-Origin' header is present on the requested resource

Question

我正在使用 Django 和 React 使用 Rest Framework 进行项目。我已经设置了CORS_ALLOW_ALL_ORIGINS=True在 settings.py 中，我仍然收到错误 Access to XMLHttpRequest at 'http://127.0.0.1:8000/api/encrypt/' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.我正在使用 axios 发布和获取请求。令人惊讶的是，即使在发出错误发布请求但获取请求失败之后。
这是使用 axios 的 react 文件

sendImage =()=> {
     this.activateSpinner()
     let formData = new FormData()
     formData.append('to_be_hidden', this.state.files[0], this.state.files[0].name)
     formData.append('used_to_hide', this.state.files[1], this.state.files[1].name)
     axios.post('http://127.0.0.1:8000/api/encrypt/', formData, {
         headers: {
            'accept': 'application/json',
            'content-type': 'multipart/form-data'
         }
     })
     .then(resp=>{
         this.getImageClass(resp)
         console.log(resp.data.id)
     })
     .catch(err=>{
         console.log("Code broke at send image")
         console.log(err)
     })
 }

 getImageClass =(obj)=> {
     axios.get(`http://127.0.0.1:8000/api/encrypt/${obj.data.id}/`, {
         headers: {
            'accept': 'application/json',
         }
     })
     .then(resp=>{
         this.setState({recentImage:resp})
         console.log(resp)
     })
     .catch(err=>{
        console.log("Code broke at get image")
        console.log(err)
    })
    this.deactivateSpinner()

 }

Answer 1

这绝对是后端的问题，我的意思是 Django。CORS_ALLOW_ALL_ORIGINS=True一旦你设置了 CORS_ALLOW_ALL_ORIGINS值，您还需要设置 ALLOWED_HOSTS 的值.
例如ALLOWED_HOSTS=['*']请查看以下链接。https://pypi.org/project/django-cors-headers/https://dzone.com/articles/how-to-fix-django-cors-error