nginx                  | 172.18.0.1 - - [19/Jul/2018:07:40:55 +0000] "POST /api/pseven/graphql/ HTTP/1.1" 200 45877 "http://localhost:8000/pseven-dev/" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36"
server                 | asyncio: ERROR: Fatal error: protocol.data_received() call failed.
server                 | protocol: <uvicorn.protocols.http.httptools.HttpToolsProtocol object at 0x7f8519a8fcc8>
server                 | transport: <_SelectorSocketTransport fd=10 read=polling write=<idle, bufsize=0>>
nginx                  | 2018/07/19 07:40:56 [error] 40#40: *25 upstream prematurely closed connection while reading response header from upstream, client: 172.18.0.1, server: localhost, request: "GET /api/pseven/graphql/ HTTP/1.1", upstream: "http://172.18.0.6:8000/api/pseven/graphql/", host: "localhost:8000"
nginx                  | 172.18.0.1 - - [19/Jul/2018:07:40:56 +0000] "GET /api/pseven/graphql/ HTTP/1.1" 502 584 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36"
server                 | Traceback (most recent call last):
server                 |   File "/pSeven/venv/lib/python3.7/site-packages/uvicorn/protocols/http/httptools.py", line 100, in data_received
server                 |     self.parser.feed_data(data)
server                 |   File "httptools/parser/parser.pyx", line 196, in httptools.parser.parser.HttpParser.feed_data
server                 | httptools.parser.errors.HttpParserUpgrade: 788
server                 |
server                 | During handling of the above exception, another exception occurred:
server                 |
server                 | Traceback (most recent call last):
server                 |   File "/usr/lib/python3.7/asyncio/selector_events.py", line 824, in _read_ready__data_received
server                 |     self._protocol.data_received(data)
server                 |   File "/pSeven/venv/lib/python3.7/site-packages/uvicorn/protocols/http/httptools.py", line 106, in data_received
server                 |     websocket_upgrade(self)
server                 |   File "/pSeven/venv/lib/python3.7/site-packages/uvicorn/protocols/websockets/websockets.py", line 18, in websocket_upgrade
server                 |     key = websockets.handshake.check_request(get_header)
server                 |   File "/pSeven/venv/lib/python3.7/site-packages/websockets/handshake.py", line 83, in check_request
server                 |     connection = parse_connection(headers.get('Connection', ''))
server                 | AttributeError: 'function' object has no attribute 'get'
server                 | asyncio: ERROR: Fatal error: protocol.data_received() call failed.
server                 | protocol: <uvicorn.protocols.http.httptools.HttpToolsProtocol object at 0x7f85176e2430>
server                 | transport: <_SelectorSocketTransport fd=10 read=polling write=<idle, bufsize=0>>
server                 | Traceback (most recent call last):
server                 |   File "/pSeven/venv/lib/python3.7/site-packages/uvicorn/protocols/http/httptools.py", line 100, in data_received
server                 |     self.parser.feed_data(data)
server                 |   File "httptools/parser/parser.pyx", line 196, in httptools.parser.parser.HttpParser.feed_data
server                 | httptools.parser.errors.HttpParserUpgrade: 788
server                 |
server                 | During handling of the above exception, another exception occurred:
server                 |
server                 | Traceback (most recent call last):
server                 |   File "/usr/lib/python3.7/asyncio/selector_events.py", line 824, in _read_ready__data_received
server                 |     self._protocol.data_received(data)
server                 |   File "/pSeven/venv/lib/python3.7/site-packages/uvicorn/protocols/http/httptools.py", line 106, in data_received
server                 |     websocket_upgrade(self)
server                 |   File "/pSeven/venv/lib/python3.7/site-packages/uvicorn/protocols/websockets/websockets.py", line 18, in websocket_upgrade
server                 |     key = websockets.handshake.check_request(get_header)
server                 |   File "/pSeven/venv/lib/python3.7/site-packages/websockets/handshake.py", line 83, in check_request
server                 |     connection = parse_connection(headers.get('Connection', ''))
server                 | AttributeError: 'function' object has no attribute 'get'