Exception while running simple aiohttp server

[ashish01]

I am running the following command

gunicorn ex:HttpRequestHandler -b 0.0.0.0:8080 -k gaiohttp

and I am getting following exception

Error: class uri 'gaiohttp' invalid or not found: 

[Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/gunicorn/util.py", line 139, in load_class
    mod = import_module('.'.join(components))
  File "/usr/lib/python3.4/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2231, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2214, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2201, in _find_and_load_unlocked
ImportError: No module named 'gunicorn.workers.gaiohttp'
]

The contents of ex.py are

"""Basic http server with minimal setup"""
import aiohttp
import aiohttp.server

import asyncio
from urllib.parse import urlparse, parse_qsl
from aiohttp.multidict import MultiDict


class HttpRequestHandler(aiohttp.server.ServerHttpProtocol):

    @asyncio.coroutine
    def handle_request(self, message, payload):
        response = aiohttp.Response(
            self.writer, 200, http_version=message.version)
        get_params = MultiDict(parse_qsl(urlparse(message.path).query))
        if message.method == 'POST':
            post_params = yield from payload.read()
        else:
            post_params = None
        content = "<h1>It Works!</h1>"
        if get_params:
            content += "<h2>Get params</h2><p>" + str(get_params) + "</p>"
        if post_params:
            content += "<h2>Post params</h2><p>" + str(post_params) + "</p>"
        bcontent = content.encode('utf-8')
        response.add_header('Content-Type', 'text/html; charset=UTF-8')
        response.add_header('Content-Length', str(len(bcontent)))
        response.send_headers()
        response.write(bcontent)
        yield from response.write_eof()

[berkerpeksag]

Thanks for the report. This is a duplicate of #830.