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Missing data in response body

I have a web service(FastAPI) deployed on AWS EC2.

In java client code, when I call the api, i got this error

org.apache.http.ConnectionClosedException: Premature end of Content-Length delimited message body (expected: 3,849,324; received: 1,834,837)

In postman, when I call this api, the response is returned but not enough like this image enter image description here

Seem the server (Fast API web service) do not return all data in response body.

I already check this question, the accepted answer said that this error is belong server-side.

So what is the problem here? What can I configure to solve this problem, on the AWS or my web service or any ?

Additional information, in the API implementation, business logic is connect to the AWS S3 and download some files. I don’t know if this is the problem but when I looked for solution, a lot of people said it related to AWS S3

Thank you all guys!!!

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Answer

After several investigating hours. My leader found the issue, it’s out of memory issue. It is out of Hard disk driver instead of RAM. Lol

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