api resource_error ai_generated true

413 Request Entity Too Large: Request size exceeds the maximum allowed limit for the API Gateway.

ID: api/api-gateway-request-too-large

Also available as: JSON · Markdown · 中文
85%Fix Rate
89%Confidence
1Evidence
2023-11-08First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
AWS API Gateway REST API active — — —
NGINX 1.24 active — — —
Azure API Management active — — —

Root Cause

HTTP request body or headers exceed the size limit configured on the API gateway (e.g., AWS API Gateway 10MB, NGINX 1MB).

generic

中文

HTTP请求体或头部超过API网关配置的大小限制（如AWS API Gateway 10MB，NGINX 1MB）。

Official Documentation

https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-known-issues.html

Workarounds

  1. 90% success Increase the maximum request size on the gateway. For NGINX: add 'client_max_body_size 20M;' in the http or server block. For AWS API Gateway, increase the payload limit to 10MB (maximum) or use binary media types. 
    Increase the maximum request size on the gateway. For NGINX: add 'client_max_body_size 20M;' in the http or server block. For AWS API Gateway, increase the payload limit to 10MB (maximum) or use binary media types.
  2. 80% success Split large payloads into chunks using multipart upload or paginated API calls. Example: POST /upload with 'Content-Range: bytes 0-1048575/5242880' header. 
    Split large payloads into chunks using multipart upload or paginated API calls. Example: POST /upload with 'Content-Range: bytes 0-1048575/5242880' header.
  3. 85% success Use a direct upload to cloud storage (e.g., S3 presigned URL) and pass only the reference (URL) in the API request. 
    Use a direct upload to cloud storage (e.g., S3 presigned URL) and pass only the reference (URL) in the API request.

中文步骤

  1. Increase the maximum request size on the gateway. For NGINX: add 'client_max_body_size 20M;' in the http or server block. For AWS API Gateway, increase the payload limit to 10MB (maximum) or use binary media types.
  2. Split large payloads into chunks using multipart upload or paginated API calls. Example: POST /upload with 'Content-Range: bytes 0-1048575/5242880' header.
  3. Use a direct upload to cloud storage (e.g., S3 presigned URL) and pass only the reference (URL) in the API request.

Dead Ends

Common approaches that don't work:

  1. 85% fail

    Increasing client-side timeout without reducing payload size does not resolve the 413 error, as the gateway rejects the request before it reaches the backend.

  2. 70% fail

    Adding compression headers (e.g., gzip) but sending uncompressed large payload still triggers the limit because the gateway checks raw size before decompression.