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502 error

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Laravel Tech Community
Laravel Tech Community
Mar 21, 2023 · Backend Development

Resolving 502 Bad Gateway Errors in Nginx + PHP‑FPM + MySQL Environments

This guide explains common causes of 502 Bad Gateway in Nginx‑PHP‑MySQL stacks—such as memory limits, PHP‑FPM process settings, buffer sizes, timeouts, and system limits—and provides detailed configuration adjustments and command‑line checks to eliminate the errors.

502 errorLinuxNginx
0 likes · 6 min read
Resolving 502 Bad Gateway Errors in Nginx + PHP‑FPM + MySQL Environments
Efficient Ops
Efficient Ops
May 15, 2022 · Cloud Native

Why POST Requests Get 502 After PaaS Migration – Nginx, Ingress & uWSGI Explained

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.

502 errorHTTP versionIngress
0 likes · 6 min read
Why POST Requests Get 502 After PaaS Migration – Nginx, Ingress & uWSGI Explained
Efficient Ops
Efficient Ops
Feb 24, 2022 · Operations

Why 502 Errors Show Up Only on POST? Uncovering Nginx‑Ingress‑uWSGI Mismatch

After migrating to a PaaS platform, intermittent 502 errors appeared on both GET and POST requests, and a detailed analysis of Nginx retry behavior, Ingress HTTP version settings, and uWSGI incompatibility reveals the root cause and a configuration fix.

502 errorIngressKubernetes
0 likes · 6 min read
Why 502 Errors Show Up Only on POST? Uncovering Nginx‑Ingress‑uWSGI Mismatch
Beike Product & Technology
Beike Product & Technology
May 23, 2019 · Backend Development

Investigation of Nginx 502 Errors Caused by PHP‑FPM Warning Triggering a FastCGI Buffer Defect

This article analyses why seemingly normal PHP‑FPM requests can cause Nginx to return 502 errors, revealing a FastCGI fastcgi_buffer_size bug triggered by warning output, describing the reproduction steps, detailed packet analysis, the underlying protocol mechanics, and practical recommendations for developers and operators.

502 errorBufferFastCGI
0 likes · 17 min read
Investigation of Nginx 502 Errors Caused by PHP‑FPM Warning Triggering a FastCGI Buffer Defect