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4xx Client & Proxy Request

HTTP 413 Content Too Large — Reverse Proxy & Gateway Troubleshooting

HTTP 413 Content Too Large (formerly Payload Too Large / Request Entity Too Large) aborts uploads immediately when Content-Length or chunked stream bytes exceed the reverse proxy's configured body limit.

Status Code413 Content Too Large
Specification / OriginRFC 9110 §15.5.14
Failure LayerReverse Proxy Body Guard
Retry SafetyDo not blind-retry without fixing request syntax, auth, or origin certificate

Interactive HTTP 413 Live Probe & Log Command Builder

Enter your target endpoint below to generate copy-ready curl latency breakdown probes and origin bypass tests:


  

    Related diagnostics:
    Nginx & Caddy Proxy Generator → ·
    X.509 SSL Certificate Decoder → ·
    Offline JWT Expiry Inspector →
  






  
Production Root Causes & Remediation Guide

  
Nginx defaults to a strict 1 MiB limit (client_max_body_size 1m), Kubernetes ingress-nginx annotations default similarly (proxy-body-size), and Cloudflare Free/Pro plans enforce a 100 MB per-request upload cap.

  
Step-by-Step Engineering Fix

  
Raise client_max_body_size in both edge and internal ingress Nginx blocks, or architect direct multipart presigned uploads straight to object storage (S3 / R2) to bypass reverse-proxy memory buffering.

  
Recommended Nginx / Reverse-Proxy Configuration Snippet

  
client_max_body_size 50m;
client_body_buffer_size 512k;







  
Frequently Asked Questions (HTTP 413)

  
  

    Why do 2 MB file uploads fail on Nginx even after raising PHP or Node body limits?
    
Nginx rejects requests exceeding its default 1m client_max_body_size at the edge before a single byte reaches the upstream Node, Python, or PHP process.

  

  
  

    Which infrastructure layer generates HTTP 413 Content Too Large?
    
HTTP 413 (RFC 9110 §15.5.14) typically originates at the Reverse Proxy Body Guard layer. HTTP 413 Content Too Large (formerly Payload Too Large / Request Entity Too Large) aborts uploads immediately when Content-Length or chunked stream bytes exceed the reverse proxy's configured body limit.

  

  
  

    Should API clients automatically retry HTTP 413 responses?
    
Do not blind-retry HTTP 413 without fixing the underlying request payload, authentication token, or origin TLS certificate first.

  

  






  
Browse All 25 Gateway, Proxy & Cloud HTTP Error Guides

  

    
      HTTP 400 (Bad Request)
    
      HTTP 401 (Unauthorized)
    
      HTTP 403 (Forbidden)
    
      HTTP 404 (Not Found)
    
      HTTP 405 (Method Not Allowed)
    
      HTTP 408 (Request Timeout)
    
      HTTP 413 (Content Too Large)
    
      HTTP 422 (Unprocessable Content)
    
      HTTP 429 (Too Many Requests)
    
      HTTP 431 (Request Header Fields Too Large)
    
      HTTP 499 (Client Closed Request)
    
      HTTP 500 (Internal Server Error)
    
      HTTP 501 (Not Implemented)
    
      HTTP 502 (Bad Gateway)
    
      HTTP 503 (Service Unavailable)
    
      HTTP 504 (Gateway Timeout)
    
      HTTP 507 (Insufficient Storage)
    
      HTTP 511 (Network Authentication Required)
    
      HTTP 520 (Web Server Returned an Unknown Error)
    
      HTTP 521 (Web Server Is Down)
    
      HTTP 522 (Connection Timed Out)
    
      HTTP 523 (Origin Is Unreachable)
    
      HTTP 524 (A Timeout Occurred)
    
      HTTP 525 (SSL Handshake Failed)
    
      HTTP 526 (Invalid SSL Certificate)
    
  






  


  
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