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Status Needs more information
Workspace Instana
Categories C / Team Proxies
Created by Guest
Created on Mar 7, 2023

RELATED IDEAS

Handle http status code 0 not as error

See this idea on ideas.ibm.com

Envoy is becoming a popular reverse proxy in the cloud native space. Although it is supported by Instana for monitoring and tracing, we found one case where traces are marked as erroneous, but should not be: Client disconnects.

When a client closes the connection to envoy before getting the response, envoy will set the response status code to 0. Instana interprets this as an error. Nginx does something similar in case the client disconnects, but respond with the status code 499. The status code 499 is not considered erroneous by Instana.

Idea priority Medium
  • Admin
    Aysha Kanakkovil
    Aug 20, 2025

    Hi @Guest,

    We have attempted to reproduce the issue on our end but haven’t been successful so far. It would be very helpful if you could provide us with a test case that reliably triggers the bug.

    Here is how we tried reproducing the issues:

    I've tried several times with https://github.com/instana/envoy-otel-tracing, Envoy 1.35.0 and "kill -9 ${pid_of_client_app-app.jar}" and restarting the client app with "docker-compose restart client-app". I've also tried

    "while [ 1 ]; do sleep 15; docker-compose restart client-app; done"

    Most promising:

    while [ 1 ]; do for i in `pidof java`; do OUTPUT=$(sudo ls -l /proc/$i/fd); GOUT="$(grep client-app <<< $OUTPUT)"; if [ -n "$GOUT" ]; then echo "$i is a client-app - killing it"; sudo kill -9 $i; fi; done; sleep 2; docker-compose restart client-app; sleep 20; done

    Thank you!

    Reply

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