botocore.errorfactory.InvalidParameterException: An error occurred (InvalidParameter) when calling the Subscribe operation: Invalid parameter: Invalid protocol type: application

[sandeepks230]

I am trying to subscribe an endpoint to a topic using boto3. But I am getting this error:
Traceback (most recent call last):
File "/home/st0096/PycharmProjects/pythonProject/notificationsnstest.py", line 22, in
response = sns_client.subscribe(
File "/home/st0096/.local/lib/python3.10/site-packages/botocore/client.py", line 514, in _api_call
return self._make_api_call(operation_name, kwargs)
File "/home/st0096/.local/lib/python3.10/site-packages/botocore/client.py", line 934, in _make_api_call
raise error_class(parsed_response, operation_name)
botocore.errorfactory.InvalidParameterException: An error occurred (InvalidParameter) when calling the Subscribe operation: Invalid parameter: Invalid protocol type: application

This is my code:
`sns_client = boto3.client(
service_name="sns", aws_access_key_id=SNS_ACCESS_KEY_ID,
aws_secret_access_key=SNS_SECRET_ACCESS_KEY,
region_name=SNS_REGION_NAME, use_ssl=True)

response = sns_client.subscribe(
TopicArn=topic,
Protocol='application',
Endpoint=endpoint,
ReturnSubscriptionArn=True
)`

[aBurmeseDev]

Hi @sandeepks230, thanks for reaching out.

I tried to reproduce with your code and didn't get the same error. I would double check on the parameters' values you have in your code. Here's the docs on SNS subscribe client method for your reference: https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/sns.html#SNS.Client.subscribe

If you're still having issue, please share the full debug logs by adding boto3.set_stream_logger('') to your script. Thanks!

[sandeepks230]

I did as you mentioned and this is the full log:
2022-09-03 19:39:43,615 botocore.hooks [DEBUG] Event before-parameter-build.sns.Subscribe: calling handler <function generate_idempotent_uuid at 0x7fd60747e170>
2022-09-03 19:39:43,615 botocore.hooks [DEBUG] Event before-call.sns.Subscribe: calling handler <function add_recursion_detection_header at 0x7fd60747de10>
2022-09-03 19:39:43,615 botocore.hooks [DEBUG] Event before-call.sns.Subscribe: calling handler <function inject_api_version_header_if_needed at 0x7fd60747f9a0>
2022-09-03 19:39:43,615 botocore.endpoint [DEBUG] Making request for OperationModel(name=Subscribe) with params: {'url_path': '/', 'query_string': '', 'method': 'POST', 'headers': {'Content-Type': 'application/x-www-form-urlencoded; charset=utf-8', 'User-Agent': 'Boto3/1.24.58 Python/3.10.4 Linux/5.15.0-47-generic Botocore/1.27.63'}, 'body': {'Action': 'Subscribe', 'Version': '2010-03-31', 'TopicArn': 'arn:aws:sns:ap-southeast-1:894852242206:sns_test.fifo', 'Protocol': 'application', 'Endpoint': 'arn:aws:sns:ap-southeast-1::endpoint/GCM//bbadcc39----**********', 'ReturnSubscriptionArn': 'true'}, 'url': 'https://sns.ap-southeast-1.amazonaws.com/', 'context': {'client_region': 'ap-southeast-1', 'client_config': <botocore.config.Config object at 0x7fd60734ed70>, 'has_streaming_input': False, 'auth_type': None}}
2022-09-03 19:39:43,616 botocore.hooks [DEBUG] Event request-created.sns.Subscribe: calling handler <bound method RequestSigner.handler of <botocore.signers.RequestSigner object at 0x7fd60734c880>>
2022-09-03 19:39:43,616 botocore.hooks [DEBUG] Event choose-signer.sns.Subscribe: calling handler <function set_operation_specific_signer at 0x7fd60747e050>
2022-09-03 19:39:43,616 botocore.auth [DEBUG] Calculating signature using v4 auth.
2022-09-03 19:39:43,616 botocore.auth [DEBUG] CanonicalRequest:
POST
/

content-type:application/x-www-form-urlencoded; charset=utf-8
host:sns.ap-southeast-1.amazonaws.com
x-amz-date:20220903T140943Z

content-type;host;x-amz-date
8a5a7a8d0a23fb03d6a71229c33f94afe6e1329ea30ac50501e2e8e99f919085
2022-09-03 19:39:43,616 botocore.auth [DEBUG] StringToSign:
AWS4-HMAC-SHA256
20220903T140943Z
20220903/ap-southeast-1/sns/aws4_request
fc98ba464c17e6c92c84e120e4e0b41c1df81dc3af605de0d1e8a6e4b3ec51fc
2022-09-03 19:39:43,616 botocore.auth [DEBUG] Signature:
3b155d5e9bf57509faa70a0dad9883add522861e6815303dec421232f30804bf
2022-09-03 19:39:43,616 botocore.hooks [DEBUG] Event request-created.sns.Subscribe: calling handler <function add_retry_headers at 0x7fd60749c0d0>
2022-09-03 19:39:43,617 botocore.endpoint [DEBUG] Sending http request: <AWSPreparedRequest stream_output=False, method=POST, url=https://sns.ap-southeast-1.amazonaws.com/, headers={'Content-Type': b'application/x-www-form-urlencoded; charset=utf-8', 'User-Agent': b'Boto3/1.24.58 Python/3.10.4 Linux/5.15.0-47-generic Botocore/1.27.63', 'X-Amz-Date': b'20220903T140943Z', 'Authorization': b'AWS4-HMAC-SHA256 Credential=********************/20220903/ap-southeast-1/sns/aws4_request, SignedHeaders=content-type;host;x-amz-date, Signature=3b155d5e9bf57509faa70a0dad9883add522861e6815303dec421232f30804bf', 'amz-sdk-invocation-id': b'548d8fd5-9d02-46ec-ab22-6c4d6b363932', 'amz-sdk-request': b'attempt=1', 'Content-Length': '290'}>
2022-09-03 19:39:43,617 botocore.httpsession [DEBUG] Certificate path: /etc/ssl/certs/ca-certificates.crt
2022-09-03 19:39:43,617 urllib3.connectionpool [DEBUG] Starting new HTTPS connection (1): sns.ap-southeast-1.amazonaws.com:443
2022-09-03 19:39:43,981 urllib3.connectionpool [DEBUG] https://sns.ap-southeast-1.amazonaws.com:443 "POST / HTTP/1.1" 400 300
2022-09-03 19:39:43,982 botocore.parsers [DEBUG] Response headers: {'x-amzn-RequestId': '4569834c-b2ac-5028-9ecf-d8c1d0cb08f1', 'Content-Type': 'text/xml', 'Content-Length': '300', 'Date': 'Sat, 03 Sep 2022 14:09:43 GMT'}
2022-09-03 19:39:43,982 botocore.parsers [DEBUG] Response body:
b'\n \n Sender\n InvalidParameter\n Invalid parameter: Invalid protocol type: application\n \n 4569834c-b2ac-5028-9ecf-d8c1d0cb08f1\n\n'
2022-09-03 19:39:43,983 botocore.parsers [DEBUG] Response headers: {'x-amzn-RequestId': '4569834c-b2ac-5028-9ecf-d8c1d0cb08f1', 'Content-Type': 'text/xml', 'Content-Length': '300', 'Date': 'Sat, 03 Sep 2022 14:09:43 GMT'}
2022-09-03 19:39:43,983 botocore.parsers [DEBUG] Response body:
b'\n \n Sender\n InvalidParameter\n Invalid parameter: Invalid protocol type: application\n \n 4569834c-b2ac-5028-9ecf-d8c1d0cb08f1\n\n'
2022-09-03 19:39:43,983 botocore.hooks [DEBUG] Event needs-retry.sns.Subscribe: calling handler <botocore.retryhandler.RetryHandler object at 0x7fd60734f640>
2022-09-03 19:39:43,983 botocore.retryhandler [DEBUG] No retry needed.
Traceback (most recent call last):
File "/home/st0096/PycharmProjects/pythonProject/notificationsnstest.py", line 22, in
response = sns_client.subscribe(
File "/home/st0096/.local/lib/python3.10/site-packages/botocore/client.py", line 514, in _api_call
return self._make_api_call(operation_name, kwargs)
File "/home/st0096/.local/lib/python3.10/site-packages/botocore/client.py", line 934, in _make_api_call
raise error_class(parsed_response, operation_name)
botocore.errorfactory.InvalidParameterException: An error occurred (InvalidParameter) when calling the Subscribe operation: Invalid parameter: Invalid protocol type: application

I have replace the credentials with *.