Flutter: Connection closed while receiving data

Question

I'm calling post API, and sometimes I get the response from the server and sometimes I receive the exception Connection closed while receiving data. Request is same in both cases, and according to backend server logs, a response is sent but i didn't receive it. I have this issue both in simulator and actual device.

try {
  final result =
      await http.post(url, body: encodedBody, headers: apiHeader);
  Map<String, dynamic> response = json.decode(result.body);

  print("Response: $response");

  return response;
} catch (error) {
  Map<String, dynamic> response = Map<String, dynamic>();
  response['success'] = false;
  response['message'] = error;
  return response;
}

what are the headers are you sending? does it contain a keep alive header?? please post the headers — Yadu, Jul 24 '20 at 05:47
i was not sending keep alive in the headers, sending this resolves my issue. Thanks a lot — Nabeel Ashfaq, Jul 24 '20 at 06:20
@NabeelAshfaq How did you specify the Keep-Alive header to get it to work? — Lucas Aschenbach, Apr 13 '21 at 18:10
@LucasAschenbach i just added this Connection header this.apiHeader['Connection'] = "keep-alive"; — Nabeel Ashfaq, Apr 29 '21 at 17:23

score 7 · Accepted Answer · answered Jul 24 '20 at 06:25

7

Keep-Alive header in the headers of your request might be missing, please check with APIs required headers

answered Jul 24 '20 at 06:25

Yadu

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bro, I am still facing this issue and I also try adding this Keep-Alive in the header section still don't work! if you can help please – Fakhar Ilyas Mar 16 '22 at 06:31
1

Check if you're correctly adding it – Yadu Mar 18 '22 at 08:39
yes i am adding it ina correct way 'Connection': 'Keep-Alive', 'connection': 'keep-alive', i tried in both ways lower case and upercase – Fakhar Ilyas Apr 11 '22 at 18:02
I also haven't had any success with this header. I'm really not sure what to do. My connection just randomly fail. – Tyler Petrov Jan 02 '23 at 22:05
need more details – Yadu Jan 17 '23 at 14:16

score 3 · Answer 2 · answered Nov 05 '20 at 16:49

I had the issue with a get request, sometimes I get the response from the server and sometimes I receive the exception Connection closed while receiving data on same button click event. Then I founded that the number of records of particular table in database is quite large. My suggested solution is to use pagination in the backend server.

score 1 · Answer 3 · answered Jun 17 '22 at 19:25

1

I have resolved this, by using this GitHub issue https://github.com/flutter/flutter/issues/22951

answered Jun 17 '22 at 19:25

ncutixavier

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4

score 0 · Answer 4 · answered Jul 24 '20 at 03:06

It depends on the server or Rest API you are trying to call.

Sometimes it is a matter of double checking you are using a valid and appropriate URL endpoint.

Another possibility is that it is not correctly receiving authentication at the header. I had that problem once and it got solved authenticating trough the url as endpoints. Try researching if the server or rest api supports other authentication options as this last one mentioned.

Flutter: Connection closed while receiving data

4 Answers4