response to preflight request doesn't pass access control check: No 'Access-control-Allow-Origin' header is present in the requested resource

问题

Our development team is trying to upload the files into S3 with .net and facing

The S3 bucket is configured with the CORS policy as follows:

<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
<CORSRule>
    <AllowedOrigin>http://localhost:3000</AllowedOrigin>
    <AllowedMethod>GET</AllowedMethod>
    <AllowedMethod>HEAD</AllowedMethod>
    <AllowedMethod>PUT</AllowedMethod>
    <AllowedMethod>POST</AllowedMethod>
    <AllowedMethod>DELETE</AllowedMethod>
    <AllowedHeader>*</AllowedHeader>
</CORSRule>
<CORSRule>
    <AllowedOrigin>*</AllowedOrigin>
    <AllowedMethod>GET</AllowedMethod>
    <AllowedMethod>HEAD</AllowedMethod>
    <AllowedMethod>PUT</AllowedMethod>
    <AllowedMethod>POST</AllowedMethod>
    <AllowedMethod>DELETE</AllowedMethod>
    <AllowedHeader>*</AllowedHeader>
</CORSRule>
</CORSConfiguration>

Adding the javascript code

import React from 'react';
import S3FileUpload from 'react-s3';
 
//Optional Import
import ReactS3, { uploadFile } from 'react-s3';
 
const config = {
    bucketName: 'yellow-pages-bahrain',
   // dirName: 'SPA_Images/Suppliers', /* optional */
    region: 'me-south-1',
    accessKeyId: 'XXXXXXXXXXXXXXXXXX',
    secretAccessKey: 'XXXXXXXXXXXXXXXXXXXX',
}

function App() {

 const upload = (e) => { 
   
  //console.log(e.target.files);
 // S3FileUpload.uploadFile(e.target.files[0], config)
  //reactS3.uploadFile(e.target.files[0], config)
  ReactS3.uploadFile(e.target.files[0], config)
  .then ((data) => {
    console.log(data);
  })
  .catch((err) => {
    alert(err);
  } )

}

  return (
    <div>
      <header>
      <h1>Nks testupload</h1>
      <input 
      type="file"
      onChange={upload}
      />
      </header>
    </div>
  );
}

export default App;

Could anyone help us out of this. Not able to figure out how to handle this which is bugging us from days.

回答1:

Your code is working perfectly fine for me. I did not get any errors. make sure your code is using the same region as the bucket. Please double check the cors. The following is working fine for me.

<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
<CORSRule>
    <AllowedOrigin>*</AllowedOrigin>
    <AllowedMethod>GET</AllowedMethod>
    <AllowedMethod>HEAD</AllowedMethod>
    <AllowedMethod>PUT</AllowedMethod>
    <AllowedMethod>POST</AllowedMethod>
    <AllowedMethod>DELETE</AllowedMethod>
    <AllowedHeader>*</AllowedHeader>
</CORSRule>
</CORSConfiguration>

Please note that using aws credentials directly on the html frontend is not recommended. if you would like to upload from frontend, you should use s3 presignedUrls.

Uploading objects using presigned URLs

来源：https://stackoverflow.com/questions/63461863/response-to-preflight-request-doesnt-pass-access-control-check-no-access-cont

标签

reactjs

amazon-web-services

amazon-s3

cors