hello_world example not working

Description:

I have created the hello_world example from https://github.com/awslabs/aws-sam-cli/blob/develop/docs/getting_started.rst and followed the steps from README.md to build and execute a local server.

But when acessing the server from http://127.0.0.1:3001/hello (also tried http://127.0.0.1:3001) I get the following response:

{"Type": "LocalService", "Message": "PathNotFoundException"}

Steps to reproduce the issue:

1. Install Miniconda Python 3.6
2. <miniconda_bin_dir>/pip install aws-sam-cli
3. <miniconda_bin_dir>/sam init --runtime python3.6
4. cd sam-app
5. <miniconda_bin_dir>/pip install -r requirements.txt -t hello_world/build/
6. cp hello_world/*.py hello_world/build/
7. <miniconda_bin_dir>/sam --debug local start-lambda

Observed result:

The following response from http://127.0.0.1:3001/hello:

{"Type": "LocalService", "Message": "PathNotFoundException"}

Expected result:

The actual output from app.py

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

Linux Mint 18
Docker version 18.06.0-ce, build 0ffa825
Miniconda Python 3.6.5

Output of sam --version:

SAM CLI, version 0.6.0

Optional Debug logs:

$ sam --debug local start-lambda
2018-08-30 23:19:57 local start_lambda command is called
2018-08-30 23:19:57 2 resources found in the template
2018-08-30 23:19:57 Found Serverless function with name='HelloWorldFunction' and CodeUri='hello_world/build/'
2018-08-30 23:19:57 Trying paths: ['/home/caian/.docker/config.json', '/home/caian/.dockercfg']
2018-08-30 23:19:57 No config file found
2018-08-30 23:19:57 Trying paths: ['/home/caian/.docker/config.json', '/home/caian/.dockercfg']
2018-08-30 23:19:57 No config file found
2018-08-30 23:19:57 http://localhost:None "GET /v1.35/_ping HTTP/1.1" 200 2
2018-08-30 23:19:57 Trying paths: ['/home/caian/.docker/config.json', '/home/caian/.dockercfg']
2018-08-30 23:19:57 No config file found
2018-08-30 23:19:57 Trying paths: ['/home/caian/.docker/config.json', '/home/caian/.dockercfg']
2018-08-30 23:19:57 No config file found
2018-08-30 23:19:57 Starting the Local Lambda Service. You can now invoke your Lambda Functions defined in your template through the endpoint.
2018-08-30 23:19:57 Localhost server is starting up. Multi-threading = True
2018-08-30 23:19:57  * Running on http://127.0.0.1:3001/ (Press CTRL+C to quit)
2018-08-30 23:23:28 127.0.0.1 - - [30/Aug/2018 23:23:28] "GET /hello HTTP/1.1" 404 -
2018-08-30 23:23:33 127.0.0.1 - - [30/Aug/2018 23:23:33] "GET / HTTP/1.1" 404 -