Error parsing the X-Amz-Credential parameter

Question

Hi there,

I'm trying to upload a large file via a pre-signed URL that is generated by a Lambda function on an API call.

Here's the code that I am currently using. (https://sookocheff.com/post/api/uploading-large-payloads-through-api-gateway/)

import uuid
import os
import boto3


def lambda_handler(event, context):
    # Get the service client.
    s3 = boto3.client('s3', region_name="af-south-1")

    # Generate a random S3 key name
    upload_key = uuid.uuid4().hex+".zip"

    # Generate the presigned URL for put requests
    presigned_url = s3.generate_presigned_url(
        ClientMethod='put_object',
        Params={
            'Bucket': os.environ["CLIENT_BUCKET"],
            'Key': upload_key
        }
    )

    # Return the presigned URL
    return {
        "upload_url": presigned_url
    }

The cURL commands that I run are as follows:

curl -i --request POST "<API-ENDPOINT>"

(This works)

Then I run

curl --request PUT --upload-file ./A_B_C.zip "<PRESIGNED-URL>"

But this returns:

<?xml version="1.0" encoding="UTF-8"?>

<Error><Code>AuthorizationQueryParametersError</Code><Message>Error parsing the X-Amz-Credential parameter; the region 'af-south-1' is wrong; expecting 'us-east-1'</Message><Region>us-east-1</Region><RequestId>G08721G7TVQ1XXVY</RequestId><HostId>tWmM+fSqNwWvpVP2ywko9Qnkc1G1WbCkT0U1L9pqfO3MJXnEt3wy6FKQrUAMjAQ+Y/lpqKabtm8=</HostId></Error>

NOTE: The bucket that I'm trying to reach is in af-south-1

What am I doing wrong here?

Answer

Since the bucket name is unique, you don't need to specify the region at all. Try without it.
If not working, refer to these other solutions: [https://stackoverflow.com/questions/49522014/imagefield-with-django-storages-leads-to-error-parsing-the-x-amz-credential-pa](https://stackoverflow.com/questions/49522014/imagefield-with-django-storages-leads-to-error-parsing-the-x-amz-credential-pa)

I have working result with my lambda in eu-west-1 and the bucket in us-east-1 with this:
```python

import uuid
import os
import boto3

def lambda_handler(event, context):
    # Get the service client.
    s3 = boto3.client('s3')

# Generate a random S3 key name
    upload_key = uuid.uuid4().hex

# Generate the presigned URL for put requests
    presigned_url = s3.generate_presigned_url(
        ClientMethod='put_object',
        Params={
            'Bucket': 'test-abaschen-todelete',
            'Key': upload_key,
            'ContentType': 'application/zip'
        },
        HttpMethod='PUT'
    )

# Return the presigned URL
    return {
        "upload_url": presigned_url
    }
```

Error parsing the X-Amz-Credential parameter

Relevant content