Firehose client `generate_presigned_url` method throws exception

When trying to generate a presigned URL for a firehose put_record operation, the following exception is thrown:

Traceback (most recent call last):
  File "foo.py", line 17, in <module>
    'Data': b'FOOBARBAZQUX'
  File "[...]/boto3/venv/lib/python3.4/site-packages/botocore/signers.py", line 517, in generate_presigned_url
    operation_name=operation_name)
  File "[...]/boto3/venv/lib/python3.4/site-packages/botocore/signers.py", line 253, in generate_presigned_url
    'presign-url', expires_in)
  File "[...]/boto3/venv/lib/python3.4/site-packages/botocore/signers.py", line 147, in sign
    auth.add_auth(request)
  File "[...]/boto3/venv/lib/python3.4/site-packages/botocore/auth.py", line 319, in add_auth
    self._modify_request_before_signing(request)
  File "[...]/boto3/venv/lib/python3.4/site-packages/botocore/auth.py", line 459, in _modify_request_before_signing
    query_dict.update(request.data)
TypeError: cannot convert dictionary update sequence element #0 to a sequence

The following code demonstrates the issue:

import boto3

kinesis = boto3.client(
    'firehose',
    region_name='us-east-1',
    aws_access_key_id ='KEY',
    aws_secret_access_key='SECRET'
)

kinesis.generate_presigned_url(
    'put_record',
    Params={
        'DeliveryStreamName':'STREAM',
        'Record': {
            'Data': b'FOOBARBAZQUX'
        }
    }
)

It appears as if the request body is being converted to a bytestring via serialize_to_request (https://github.com/boto/botocore/blob/develop/botocore/serialize.py#L307). However, when the presigning happens later, the request body is assumed to be a dictionary request_signer.generate_presigned_url (https://github.com/boto/botocore/blob/develop/botocore/auth.py#L459)

[swetashre]

@ebenpack - Following up on this issue. I am not getting runtime error now but it looks like service does not support this. I am marking this as documentation as we may want to remove it from documentation.

[swetashre]

Let’s track this issue under the issue https://github.com/boto/boto3/issues/1354

I am closing this one as duplicate.