App Platform - Weird restarts + 504 Error

Hi community and thank your for your time.

I’m using App Platform since 3 months (come from Heroku) and i have two strange behaviors :

  • First , sometimes my Node.JS app reboot automatically for no reasons. I can see the “restart count” insights which increases 7/8 times a day. I’m using winston and Logtail to track errors in my app but there is no log before the “Server listening…” line. Also, the RAM and CPU are fine. How can i know why my app is restarting ?

image alt text

  • Secondly, sometimes, i have the following error during requests between two services (APIs) :
      <!DOCTYPE html>
          <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
          <meta name=\"robots\" content=\"noindex\">
          <style>body,html{height:100%;margin:0}body{display:flex;align-items:center;justify-content:center;flex-direction:column;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}p{text-align:center;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;color:#000;font-size:14px;margin-top:-50px}p.code{font-size:24px;font-weight:500;border-bottom:1px solid #e0e1e2;padding:0 20px 15px}p.text{margin:0}a,a:visited{color:#aaa}</style>
      <p class=\"code\">
      <p class=\"text\">
        We encountered an error when trying to load your application and your page could not be served. Check the logs for your application in the App Platform dashboard.
        <div style=\"display:none;\">
    upstream_reset_before_response_started{connection_termination} (503 UC)      </h1>
          <p data-translate=\"connection_timed_out\">App Platform failed to forward this request to the application.</p>

It’s critical becauses it breaks somes requests. I have no logs for that too.

Thank you for your help.

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Bobby Iliev
Site Moderator
Site Moderator badge
May 6, 2023

Hi there,

This seems to be a duplicate question, I’ve posted an answer here:

Let me know how it goes!



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