S3 Trigger to HTTP Post "Device Busy"

ERROR!!: [Errno 16] Device or resource busy

import json
import os
import boto3
import base64
import http.client
import io
import urllib.parse

s3_client = boto3.client('s3')

def lambda_handler(event, context):
    con = None
    try:
        #Obtain S3 Object. Body = botocore.response.StreamingBody object
        print('TRANSPORT STREAM EVENT')
        s3_Bucket_Name = event["Records"][0]["s3"]["bucket"]["name"]
        s3_File_Name = event["Records"][0]["s3"]["object"]["key"]
        print(s3_Bucket_Name)
        print(s3_File_Name)
        s3_response = s3_client.get_object(Bucket=s3_Bucket_Name, Key=s3_File_Name)
        print(s3_response)

        auth_bytes = os.environ.get("AUTH").encode('utf-8')
        headers = {
            'Content-type': 'application/x-www-form-urlencoded',
            'Authorization': 'Basic {}'.format(base64.b64encode(auth_bytes).decode('utf-8'))
        }
        # Set the Content-Length header
        headers['Content-Length'] = str(s3_response['ContentLength'])

        rootFolder = os.environ.get("STREAM_FOLDER")

        params = {
            "path": rootFolder,
            "fileName": s3_File_Name,
            "searchable": "false",
            "crossDomain": "true"
        }
        query_string = '&'.join([f"{key}={value}" for key, value in params.items()])
        testUrl = os.environ.get("TEST_URL")
        uploadContext = os.environ.get("UPLOAD_CONTEXT")
        print("POST TO:: " + testUrl + uploadContext + '?' + query_string)
        encoded_params = urllib.parse.urlencode(params)

        streaming_body = s3_response['Body']

        con = http.client.HTTPConnection(testUrl, 80, timeout=10)
        con.request('POST', uploadContext + '?' + encoded_params, body=streaming_body, headers=headers)
        response = con.getresponse()
        print("TEST Response:: " + response.read().decode())
    except OSError as e:
        print(f"ERROR!!: {e}")

    finally:
        if con is not None:
            con.close()