No response from server

I tried running the script(https://github.com/Automattic/atd-server-next/blob/master/run.sh) and it always gives me an empty response.
The sample request with the postman is attached below.
```
import http.client

conn = http.client.HTTPConnection("127.0.0.1:1049")

headers = {
'key': "dashnine",
'data': "iam wrting a wrong sentene",
'cache-control': "no-cache",
'postman-token': "8bd7b009-5488-c686-2dd9-444fd348d6ff"
}

conn.request("POST", "/checkDocument", headers=headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
```

Please let me know if I am missing something.

Start with run.sh and the /checkDocument endpoint, then reproduce the supplied Python HTTPConnection request against 127.0.0.1:1049. Check the server's response and whether the request format matches what the endpoint expects. Done means the reported empty response is explained and the sample request produces a non-empty response or a clear error.

Written by the indexing model from the issue text.