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After moving an application to a PaaS platform, intermittent 502 errors occur due to Nginx’s retry behavior, HTTP/1.1 connection reuse, and a mismatch between Ingress and uwsgi protocols, which can be diagnosed through error statistics and packet capture.
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After moving an application to a PaaS platform, intermittent 502 errors appear mainly on POST requests; the article analyzes Nginx retry behavior, Ingress‑uwsgi protocol mismatches, packet‑capture findings, and provides a configuration fix to resolve the issue.
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