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I am encountering an unexpected behaviour in akka-http POST request endpoint, which sends the payload of around 40kb. After 8-9 times the request hangs with the response 

> Host: localhost:9090
> User-Agent: curl/7.54.0
> Accept: */*
> Content-Type: application/json
> Content-Length: 1726
> Expect: 100-continue
> 
* Done waiting for 100-continue

On looking for solution I tried the request adding -H 'Expect:', upon which the request hangs with response

> POST /xstreams/v1/submitJob HTTP/1.1
> User-Agent: curl/7.29.0
> Host: 10.xxx.xx.xx:9090
> Accept: */*
> Content-Type: application/json
> Content-Length: 42464
> 
* upload completely sent off: 42464 out of 42464 bytes

I am not able to find the root cause, whether it be due to some backpressure created PS: The request is made at interval of 30 min and hangs after 8-9 times and works after the services is restarted

Vishal
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1 Answers1

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Your application might run out of available threads. Have you tried to see what threads are doing when you get a Done waiting for 100-continue ?

mibon
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