local invoke command causes botocore.exceptions.NoRegionError:

[MariusVolkhart]

Description

The sam local invoke command produces a botocore.exceptions.NoRegionError exception, which prevents its use.

#583 Fixed this for the sample code it seems

Steps to reproduce

On Mac OS:

1. Follow direction to install via Homebrew
2. Run echo '{"message": "Hey, are you there?" }' | sam local invoke "Signup". The function name doesn't matter; it can be anything.

Observed result

 echo '{"message": "Hey, are you there?" }' | sam local invoke "Signup" --debug
2018-12-24 18:26:53 Using SAM Template at /Users/marius_v/Documents/personal/identityvault-serverless/template.yaml
2018-12-24 18:26:53 Changing event name from creating-client-class.iot-data to creating-client-class.iot-data-plane
2018-12-24 18:26:53 Changing event name from before-call.apigateway to before-call.api-gateway
2018-12-24 18:26:53 Changing event name from request-created.machinelearning.Predict to request-created.machine-learning.Predict
2018-12-24 18:26:53 Changing event name from before-parameter-build.autoscaling.CreateLaunchConfiguration to before-parameter-build.auto-scaling.CreateLaunchConfiguration
2018-12-24 18:26:53 Changing event name from before-parameter-build.route53 to before-parameter-build.route-53
2018-12-24 18:26:53 Changing event name from request-created.cloudsearchdomain.Search to request-created.cloudsearch-domain.Search
2018-12-24 18:26:53 Changing event name from docs.*.autoscaling.CreateLaunchConfiguration.complete-section to docs.*.auto-scaling.CreateLaunchConfiguration.complete-section
2018-12-24 18:26:53 Changing event name from before-parameter-build.logs.CreateExportTask to before-parameter-build.cloudwatch-logs.CreateExportTask
2018-12-24 18:26:53 Changing event name from docs.*.logs.CreateExportTask.complete-section to docs.*.cloudwatch-logs.CreateExportTask.complete-section
2018-12-24 18:26:53 Changing event name from before-parameter-build.cloudsearchdomain.Search to before-parameter-build.cloudsearch-domain.Search
2018-12-24 18:26:53 Changing event name from docs.*.cloudsearchdomain.Search.complete-section to docs.*.cloudsearch-domain.Search.complete-section
2018-12-24 18:26:53 Changing event name from creating-client-class.iot-data to creating-client-class.iot-data-plane
2018-12-24 18:26:53 Changing event name from before-call.apigateway to before-call.api-gateway
2018-12-24 18:26:53 Changing event name from request-created.machinelearning.Predict to request-created.machine-learning.Predict
2018-12-24 18:26:53 Changing event name from before-parameter-build.autoscaling.CreateLaunchConfiguration to before-parameter-build.auto-scaling.CreateLaunchConfiguration
2018-12-24 18:26:53 Changing event name from before-parameter-build.route53 to before-parameter-build.route-53
2018-12-24 18:26:53 Changing event name from request-created.cloudsearchdomain.Search to request-created.cloudsearch-domain.Search
2018-12-24 18:26:53 Changing event name from docs.*.autoscaling.CreateLaunchConfiguration.complete-section to docs.*.auto-scaling.CreateLaunchConfiguration.complete-section
2018-12-24 18:26:53 Changing event name from before-parameter-build.logs.CreateExportTask to before-parameter-build.cloudwatch-logs.CreateExportTask
2018-12-24 18:26:53 Changing event name from docs.*.logs.CreateExportTask.complete-section to docs.*.cloudwatch-logs.CreateExportTask.complete-section
2018-12-24 18:26:53 Changing event name from before-parameter-build.cloudsearchdomain.Search to before-parameter-build.cloudsearch-domain.Search
2018-12-24 18:26:53 Changing event name from docs.*.cloudsearchdomain.Search.complete-section to docs.*.cloudsearch-domain.Search.complete-section
2018-12-24 18:26:53 local invoke command is called
2018-12-24 18:26:53 Reading invoke payload from stdin (you can also pass it from file with --event)
2018-12-24 18:26:53 Looking for credentials via: env
2018-12-24 18:26:53 Looking for credentials via: assume-role
2018-12-24 18:26:53 Looking for credentials via: shared-credentials-file
2018-12-24 18:26:53 Looking for credentials via: custom-process
2018-12-24 18:26:53 Looking for credentials via: config-file
2018-12-24 18:26:53 Looking for credentials via: ec2-credentials-file
2018-12-24 18:26:53 Looking for credentials via: boto-config
2018-12-24 18:26:53 Looking for credentials via: container-role
2018-12-24 18:26:53 Looking for credentials via: iam-role
2018-12-24 18:26:53 Converted retries value: False -> Retry(total=False, connect=None, read=None, redirect=0, status=None)
2018-12-24 18:26:53 Starting new HTTP connection (1): 169.254.169.254:80
2018-12-24 18:26:54 Caught retryable HTTP exception while making metadata service request to http://169.254.169.254/latest/meta-data/iam/security-credentials/: Connect timeout on endpoint URL: "http://169.254.169.254/latest/meta-data/iam/security-credentials/"
Traceback (most recent call last):
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/urllib3/connection.py", line 159, in _new_conn
    (self._dns_host, self.port), self.timeout, **extra_kw)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/urllib3/util/connection.py", line 80, in create_connection
    raise err
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/urllib3/util/connection.py", line 70, in create_connection
    sock.connect(sa)
socket.timeout: timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/httpsession.py", line 258, in send
    decode_content=False,
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/urllib3/connectionpool.py", line 638, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/urllib3/util/retry.py", line 343, in increment
    raise six.reraise(type(error), error, _stacktrace)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/urllib3/packages/six.py", line 686, in reraise
    raise value
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/urllib3/connectionpool.py", line 600, in urlopen
    chunked=chunked)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/urllib3/connectionpool.py", line 354, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1229, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/awsrequest.py", line 125, in _send_request
    method, url, body, headers, *args, **kwargs)
  File "/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1275, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1224, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/awsrequest.py", line 152, in _send_output
    self.send(msg)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/awsrequest.py", line 236, in send
    return super(AWSConnection, self).send(str)
  File "/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 956, in send
    self.connect()
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/urllib3/connection.py", line 181, in connect
    conn = self._new_conn()
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/urllib3/connection.py", line 164, in _new_conn
    (self.host, self.timeout))
urllib3.exceptions.ConnectTimeoutError: (<botocore.awsrequest.AWSHTTPConnection object at 0x1059a6d68>, 'Connection to 169.254.169.254 timed out. (connect timeout=1)')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/utils.py", line 303, in _get_request
    response = self._session.send(request.prepare())
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/httpsession.py", line 282, in send
    raise ConnectTimeoutError(endpoint_url=request.url, error=e)
botocore.exceptions.ConnectTimeoutError: Connect timeout on endpoint URL: "http://169.254.169.254/latest/meta-data/iam/security-credentials/"
2018-12-24 18:26:54 Max number of attempts exceeded (1) when attempting to retrieve data from metadata service.
2018-12-24 18:26:54 Loading JSON file: /usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/data/endpoints.json
2018-12-24 18:26:54 Event choose-service-name: calling handler <function handle_service_name_alias at 0x104be2840>
2018-12-24 18:26:54 Loading JSON file: /usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/data/serverlessrepo/2017-09-08/service-2.json
2018-12-24 18:26:54 Event creating-client-class.serverlessapplicationrepository: calling handler <function add_generate_presigned_url at 0x104ba96a8>
Traceback (most recent call last):
  File "/usr/local/bin/sam", line 11, in <module>
    load_entry_point('aws-sam-cli==0.10.0', 'console_scripts', 'sam')()
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args[1:], **kwargs)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/samcli/commands/local/invoke/cli.py", line 56, in cli
    parameter_overrides)  # pragma: no cover
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/samcli/commands/local/invoke/cli.py", line 93, in do_cli
    aws_region=ctx.region) as context:
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/samcli/commands/local/cli_common/invoke_context.py", line 130, in __enter__
    self._function_provider = SamFunctionProvider(self._template_dict, self.parameter_overrides)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/samcli/commands/local/lib/sam_function_provider.py", line 45, in __init__
    self.template_dict = SamBaseProvider.get_template(template_dict, parameter_overrides)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/samcli/commands/local/lib/sam_base_provider.py", line 60, in get_template
    template_dict = SamTranslatorWrapper(template_dict).run_plugins()
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/samcli/lib/samlib/wrapper.py", line 64, in run_plugins
    all_plugins = prepare_plugins(additional_plugins)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/samtranslator/translator/translator.py", line 226, in prepare_plugins
    required_plugins.insert(0, ServerlessAppPlugin())
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/samtranslator/plugins/application/serverless_app_plugin.py", line 54, in __init__
    self._sar_client = boto3.client('serverlessrepo')
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/boto3/__init__.py", line 91, in client
    return _get_default_session().client(*args, **kwargs)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/boto3/session.py", line 263, in client
    aws_session_token=aws_session_token, config=config)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/session.py", line 838, in create_client
    client_config=config, api_version=api_version)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/client.py", line 86, in create_client
    verify, credentials, scoped_config, client_config, endpoint_bridge)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/client.py", line 328, in _get_client_args
    verify, credentials, scoped_config, client_config, endpoint_bridge)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/args.py", line 47, in get_client_args
    endpoint_url, is_secure, scoped_config)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/args.py", line 117, in compute_client_args
    service_name, region_name, endpoint_url, is_secure)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/client.py", line 402, in resolve
    service_name, region_name)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/regions.py", line 122, in construct_endpoint
    partition, service_name, region_name)
  File "/usr/local/Cellar/aws-sam-cli/0.10.0/libexec/lib/python3.7/site-packages/botocore/regions.py", line 135, in _endpoint_for_partition
    raise NoRegionError()
botocore.exceptions.NoRegionError: You must specify a region.

Expected result

I expected to see my function run locally

Additional environment details (Ex: Windows, Mac, Amazon Linux etc)

1. OS: Mac
2. sam --version: SAM CLI, version 0.10.0

[jfuss]

This is causes by a boto3 client being instantiated in SAM when it isn't needed too. It was fixed here: aws/serverless-application-model#697.

We are waiting for SAM (aws-sam-translator) to cut a new release with the fix. Until then, you can set the default region through aws configure in the AWS CLI.

[jfuss]

SAM release a patched (1.9.1) that included the fix for this. We bumped the version in #990 so this will be released with the next SAM CLI version. Moving into Release 0.12.0 Milestone.

[jfuss]

This was released with v0.12.0

Closing

[anuraguniyal]

upgrade sam-cli but still see the issue

$ sam --version
SAM CLI, version 0.12.0

$ sam local invoke HelloWorldFunction --event event.json
Traceback (most recent call last):
  File "/home/itsme/src/sample/sample.venv/bin/sam", line 11, in <module>
    sys.exit(cli())
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args[1:], **kwargs)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/samcli/commands/local/invoke/cli.py", line 56, in cli 
    parameter_overrides)  # pragma: no cover
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/samcli/commands/local/invoke/cli.py", line 96, in do_cli
    context.local_lambda_runner.invoke(context.function_name,
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/samcli/commands/local/cli_common/invoke_context.py", line 191, in local_lambda_runner
    layer_downloader = LayerDownloader(self._layer_cache_basedir, self.get_cwd())
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/samcli/local/layers/layer_downloader.py", line 39, in __init__
    self.lambda_client = lambda_client or boto3.client('lambda')
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/boto3/__init__.py", line 91, in client
    return _get_default_session().client(*args, **kwargs)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/boto3/session.py", line 263, in client
    aws_session_token=aws_session_token, config=config)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/botocore/session.py", line 838, in create_client
    client_config=config, api_version=api_version)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/botocore/client.py", line 86, in create_client
    verify, credentials, scoped_config, client_config, endpoint_bridge)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/botocore/client.py", line 328, in _get_client_args
    verify, credentials, scoped_config, client_config, endpoint_bridge)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/botocore/args.py", line 47, in get_client_args
    endpoint_url, is_secure, scoped_config)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/botocore/args.py", line 117, in compute_client_args
    service_name, region_name, endpoint_url, is_secure)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/botocore/client.py", line 402, in resolve
    service_name, region_name)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/botocore/regions.py", line 122, in construct_endpoint
    partition, service_name, region_name)
  File "/home/itsme/src/sample/sample.venv/lib/python3.6/site-packages/botocore/regions.py", line 135, in _endpoint_for_partition
    raise NoRegionError()
botocore.exceptions.NoRegionError: You must specify a region.

I am using python 3.6. with venv

[cjiang-ias]

I get this issue as well, with sam local start-api:

christinejiang at Christine-MBP in ~/Integral/sam-app on master*
$ sam --version
SAM CLI, version 0.13.0
christinejiang at Christine-MBP in ~/Integral/sam-app on master*
$ sam local start-api
2019-03-12 18:51:43 Found credentials in shared credentials file: ~/.aws/credentials
Traceback (most recent call last):
  File "/usr/local/bin/sam", line 11, in <module>
    load_entry_point('aws-sam-cli==0.13.0', 'console_scripts', 'sam')()
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args[1:], **kwargs)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/samcli/commands/local/start_api/cli.py", line 57, in cli
    parameter_overrides)  # pragma: no cover
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/samcli/commands/local/start_api/cli.py", line 91, in do_cli
    static_dir=static_dir)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/samcli/commands/local/lib/local_api_service.py", line 44, in __init__
    self.lambda_runner = lambda_invoke_context.local_lambda_runner
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/samcli/commands/local/cli_common/invoke_context.py", line 191, in local_lambda_runner
    layer_downloader = LayerDownloader(self._layer_cache_basedir, self.get_cwd())
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/samcli/local/layers/layer_downloader.py", line 39, in __init__
    self.lambda_client = lambda_client or boto3.client('lambda')
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/boto3/__init__.py", line 91, in client
    return _get_default_session().client(*args, **kwargs)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/boto3/session.py", line 263, in client
    aws_session_token=aws_session_token, config=config)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/botocore/session.py", line 838, in create_client
    client_config=config, api_version=api_version)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/botocore/client.py", line 86, in create_client
    verify, credentials, scoped_config, client_config, endpoint_bridge)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/botocore/client.py", line 328, in _get_client_args
    verify, credentials, scoped_config, client_config, endpoint_bridge)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/botocore/args.py", line 47, in get_client_args
    endpoint_url, is_secure, scoped_config)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/botocore/args.py", line 117, in compute_client_args
    service_name, region_name, endpoint_url, is_secure)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/botocore/client.py", line 402, in resolve
    service_name, region_name)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/botocore/regions.py", line 122, in construct_endpoint
    partition, service_name, region_name)
  File "/usr/local/Cellar/aws-sam-cli/0.13.0/libexec/lib/python3.7/site-packages/botocore/regions.py", line 135, in _endpoint_for_partition
    raise NoRegionError()
botocore.exceptions.NoRegionError: You must specify a region.

[ghouston]

i have aws-sam-cli v 0.13.0 and this error is happening. i found i could work around it by providing the region on the command line.

sam local start-api --region us-east-1

[jfuss]

@ghouston Looks like there was another path that this happened on. Just submitted a PR to address it

[haipcl]

I am using version 0.15.0 of AWS SAM CLI and this error is still appearing.

[majoal0]

I am using version 0.15.0 of AWS SAM CLI and this error is still appearing.

I had the same problem. Type this into your terminal: export AWS_DEFAULT_REGION=us-west-2

[jfmmm]

Still happening in 0.16.0 when running sam local start-api