Nginx response notes

Nginx 502 Bad Gateway upstream connection failure

A practical cause and fix order for 502 errors while operating Nginx.

Nginx 301 loop fix note

An operator checklist for narrowing down 301 loop errors in Nginx and preventing recurrence.

highNginx4 min read

Nginx 413 fix note

An operator checklist for narrowing down 413 errors in Nginx and preventing recurrence.

highNginx4 min read

Nginx 301 loop fix note 2

An operator checklist for narrowing down 301 loop errors in Nginx and preventing recurrence.

Nginx 413 fix note 2

An operator checklist for narrowing down 413 errors in Nginx and preventing recurrence.

Nginx 301 loop fix note 3

An operator checklist for narrowing down 301 loop errors in Nginx and preventing recurrence.

Nginx 413 fix note 3

An operator checklist for narrowing down 413 errors in Nginx and preventing recurrence.

Nginx 301 loop fix note 4

An operator checklist for narrowing down 301 loop errors in Nginx and preventing recurrence.

lowNginx4 min read

Nginx 413 fix note 4

An operator checklist for narrowing down 413 errors in Nginx and preventing recurrence.

lowNginx4 min read

Nginx 301 loop fix note 5

An operator checklist for narrowing down 301 loop errors in Nginx and preventing recurrence.

mediumNginx5 min read

Nginx 413 fix note 5

An operator checklist for narrowing down 413 errors in Nginx and preventing recurrence.

mediumNginx5 min read

Nginx 301 loop fix note 6

An operator checklist for narrowing down 301 loop errors in Nginx and preventing recurrence.

highNginx6 min read

Nginx 413 fix note 6

An operator checklist for narrowing down 413 errors in Nginx and preventing recurrence.

highNginx6 min read

Nginx 400 first triage response

A Nginx first triage note for 400: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 403 first triage response

A Nginx first triage note for 403: authorization failure caused by missing role, stale owner, key mismatch, inherited deny, WAF policy, or object-level permission. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 404 first triage response

A Nginx first triage note for 404: routing failure caused by missing route, wrong virtual host, rewrite rule, permalink cache, ingress rule, or missing deployed file. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 413 first triage response

A Nginx first triage note for 413: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 499 first triage response

A Nginx first triage note for 499: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 500 first triage response

A Nginx first triage note for 500: application runtime failure caused by exception, parser error, framework wiring, database adapter, automation trigger, or recursive call. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 502 first triage response

A Nginx first triage note for 502: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 504 first triage response

A Nginx first triage note for 504: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx rewrite loop first triage response

A Nginx first triage note for rewrite loop: rewrite failure caused by rule order, missing RewriteBase, recursive redirects, directory context, or front-controller routing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx upstream first triage response

A Nginx first triage note for upstream: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 400 post-release regression response

A Nginx post-release regression note for 400: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 403 post-release regression response

A Nginx post-release regression note for 403: authorization failure caused by missing role, stale owner, key mismatch, inherited deny, WAF policy, or object-level permission. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 404 post-release regression response

A Nginx post-release regression note for 404: routing failure caused by missing route, wrong virtual host, rewrite rule, permalink cache, ingress rule, or missing deployed file. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 413 post-release regression response

A Nginx post-release regression note for 413: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 499 post-release regression response

A Nginx post-release regression note for 499: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 500 post-release regression response

A Nginx post-release regression note for 500: application runtime failure caused by exception, parser error, framework wiring, database adapter, automation trigger, or recursive call. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 502 post-release regression response

A Nginx post-release regression note for 502: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 504 post-release regression response

A Nginx post-release regression note for 504: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx rewrite loop post-release regression response

A Nginx post-release regression note for rewrite loop: rewrite failure caused by rule order, missing RewriteBase, recursive redirects, directory context, or front-controller routing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx upstream post-release regression response

A Nginx post-release regression note for upstream: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 400 affected user or permission response

A Nginx affected user or permission note for 400: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 403 affected user or permission response

A Nginx affected user or permission note for 403: authorization failure caused by missing role, stale owner, key mismatch, inherited deny, WAF policy, or object-level permission. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 404 affected user or permission response

A Nginx affected user or permission note for 404: routing failure caused by missing route, wrong virtual host, rewrite rule, permalink cache, ingress rule, or missing deployed file. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 413 affected user or permission response

A Nginx affected user or permission note for 413: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 499 affected user or permission response

A Nginx affected user or permission note for 499: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 500 affected user or permission response

A Nginx affected user or permission note for 500: application runtime failure caused by exception, parser error, framework wiring, database adapter, automation trigger, or recursive call. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 502 affected user or permission response

A Nginx affected user or permission note for 502: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 504 affected user or permission response

A Nginx affected user or permission note for 504: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx rewrite loop affected user or permission response

A Nginx affected user or permission note for rewrite loop: rewrite failure caused by rule order, missing RewriteBase, recursive redirects, directory context, or front-controller routing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx upstream affected user or permission response

A Nginx affected user or permission note for upstream: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 400 specific path failure response

A Nginx specific path failure note for 400: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 403 specific path failure response

A Nginx specific path failure note for 403: authorization failure caused by missing role, stale owner, key mismatch, inherited deny, WAF policy, or object-level permission. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 404 specific path failure response

A Nginx specific path failure note for 404: routing failure caused by missing route, wrong virtual host, rewrite rule, permalink cache, ingress rule, or missing deployed file. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 413 specific path failure response

A Nginx specific path failure note for 413: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 499 specific path failure response

A Nginx specific path failure note for 499: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 500 specific path failure response

A Nginx specific path failure note for 500: application runtime failure caused by exception, parser error, framework wiring, database adapter, automation trigger, or recursive call. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 502 specific path failure response

A Nginx specific path failure note for 502: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 504 specific path failure response

A Nginx specific path failure note for 504: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx rewrite loop specific path failure response

A Nginx specific path failure note for rewrite loop: rewrite failure caused by rule order, missing RewriteBase, recursive redirects, directory context, or front-controller routing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx upstream specific path failure response

A Nginx specific path failure note for upstream: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 400 proxy versus origin split response

A Nginx proxy versus origin split note for 400: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 403 proxy versus origin split response

A Nginx proxy versus origin split note for 403: authorization failure caused by missing role, stale owner, key mismatch, inherited deny, WAF policy, or object-level permission. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 404 proxy versus origin split response

A Nginx proxy versus origin split note for 404: routing failure caused by missing route, wrong virtual host, rewrite rule, permalink cache, ingress rule, or missing deployed file. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 413 proxy versus origin split response

A Nginx proxy versus origin split note for 413: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 499 proxy versus origin split response

A Nginx proxy versus origin split note for 499: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 500 proxy versus origin split response

A Nginx proxy versus origin split note for 500: application runtime failure caused by exception, parser error, framework wiring, database adapter, automation trigger, or recursive call. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 502 proxy versus origin split response

A Nginx proxy versus origin split note for 502: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 504 proxy versus origin split response

A Nginx proxy versus origin split note for 504: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx rewrite loop proxy versus origin split response

A Nginx proxy versus origin split note for rewrite loop: rewrite failure caused by rule order, missing RewriteBase, recursive redirects, directory context, or front-controller routing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx upstream proxy versus origin split response

A Nginx proxy versus origin split note for upstream: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 400 timeout and load response

A Nginx timeout and load note for 400: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 403 timeout and load response

A Nginx timeout and load note for 403: authorization failure caused by missing role, stale owner, key mismatch, inherited deny, WAF policy, or object-level permission. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 404 timeout and load response

A Nginx timeout and load note for 404: routing failure caused by missing route, wrong virtual host, rewrite rule, permalink cache, ingress rule, or missing deployed file. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 413 timeout and load response

A Nginx timeout and load note for 413: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 499 timeout and load response

A Nginx timeout and load note for 499: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 500 timeout and load response

A Nginx timeout and load note for 500: application runtime failure caused by exception, parser error, framework wiring, database adapter, automation trigger, or recursive call. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 502 timeout and load response

A Nginx timeout and load note for 502: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 504 timeout and load response

A Nginx timeout and load note for 504: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx rewrite loop timeout and load response

A Nginx timeout and load note for rewrite loop: rewrite failure caused by rule order, missing RewriteBase, recursive redirects, directory context, or front-controller routing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx upstream timeout and load response

A Nginx timeout and load note for upstream: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 400 cache or propagation drift response

A Nginx cache or propagation drift note for 400: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 403 cache or propagation drift response

A Nginx cache or propagation drift note for 403: authorization failure caused by missing role, stale owner, key mismatch, inherited deny, WAF policy, or object-level permission. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 404 cache or propagation drift response

A Nginx cache or propagation drift note for 404: routing failure caused by missing route, wrong virtual host, rewrite rule, permalink cache, ingress rule, or missing deployed file. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 413 cache or propagation drift response

A Nginx cache or propagation drift note for 413: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 499 cache or propagation drift response

A Nginx cache or propagation drift note for 499: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 500 cache or propagation drift response

A Nginx cache or propagation drift note for 500: application runtime failure caused by exception, parser error, framework wiring, database adapter, automation trigger, or recursive call. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 502 cache or propagation drift response

A Nginx cache or propagation drift note for 502: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 504 cache or propagation drift response

A Nginx cache or propagation drift note for 504: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx rewrite loop cache or propagation drift response

A Nginx cache or propagation drift note for rewrite loop: rewrite failure caused by rule order, missing RewriteBase, recursive redirects, directory context, or front-controller routing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx upstream cache or propagation drift response

A Nginx cache or propagation drift note for upstream: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 400 local versus production drift response

A Nginx local versus production drift note for 400: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 403 local versus production drift response

A Nginx local versus production drift note for 403: authorization failure caused by missing role, stale owner, key mismatch, inherited deny, WAF policy, or object-level permission. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 404 local versus production drift response

A Nginx local versus production drift note for 404: routing failure caused by missing route, wrong virtual host, rewrite rule, permalink cache, ingress rule, or missing deployed file. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 413 local versus production drift response

A Nginx local versus production drift note for 413: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 499 local versus production drift response

A Nginx local versus production drift note for 499: HTTP request rejection caused by method, header, body size, client abort, rate limit, or response-header timing. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 500 local versus production drift response

A Nginx local versus production drift note for 500: application runtime failure caused by exception, parser error, framework wiring, database adapter, automation trigger, or recursive call. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 502 local versus production drift response

A Nginx local versus production drift note for 502: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx 504 local versus production drift response

A Nginx local versus production drift note for 504: upstream failure caused by unhealthy target, wrong backend port, proxy timeout, FastCGI handoff, or load balancer health check mismatch. It includes evidence, output examples, branches, and the smallest reliable fix.

Nginx rewrite loop local versus production drift response

A Nginx local versus production drift note for rewrite loop: rewrite failure caused by rule order, missing RewriteBase, recursive redirects, directory context, or front-controller routing. It includes evidence, output examples, branches, and the smallest reliable fix.