AWS S3 Presigned URL upload image with postman

Question

I need to upload a file to S3 with postman for testing. I have a generated presigned URL from S3.

But I don't know how to configure postman correctly for doing this PUT request to my generated presigned URL.

The response on postman with malformed headers is:

<Code>SignatureDoesNotMatch</Code>
<Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message>

the params for the presigned request:

const params = {
  Bucket: 'ss-files-dev',
  Key: 'dansero.jpg',
  ContentType: 'image/jpeg',
  Expires: 100
};

I get the URL, then enter it in postman, with PUT request, but the headers are not complete? 1. if I add content-type on header, there is no response from server 2. in body for the request Im attaching file as "binary"

How to do my PUT request from postman?, thanks

Answer 1

For me, Postman added hidden headers. If I remove the Content-Type header, the Put worked as expected.

Answer 2

Make sure about the following things:

1-The file name equal and same as the key when you get the signed URL.

2-Get the signed URL for putObject by passing the right parameter to getSignedUrl.

For put request not needs to set any additional headers.

Answer 3

I was able to get this working in Postman using a POST request with “form-data” input. I put all the details in this stack overflow post.