RequestEntityTooLargeException aws runtime_error ai_generated true

ClientError: An error occurred (RequestEntityTooLargeException) when calling the Invoke operation: Request must be smaller than 6291556 bytes for the Invoke operation

ID: aws/lambda-invoke-payload-too-large

Also available as: JSON · Markdown · 中文
85%Fix Rate
87%Confidence
1Evidence
2023-03-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
lambda-2015-03-31 active — — —
boto3-1.34.0 active — — —

Root Cause

The payload sent to AWS Lambda via synchronous Invoke exceeds the maximum request size of 6 MB (6,291,556 bytes), causing the API to reject the invocation.

generic

中文

通过同步 Invoke 发送到 AWS Lambda 的负载超过了最大请求大小 6 MB（6,291,556 字节），导致 API 拒绝调用。

Official Documentation

https://docs.aws.amazon.com/lambda/latest/dg/gettingstarted-limits.html

Workarounds

  1. 90% success Use asynchronous invocation (Event invocation) which supports up to 256 KB payload, or use S3 to pass large payloads: upload to S3 and pass the object key to Lambda. 
    Use asynchronous invocation (Event invocation) which supports up to 256 KB payload, or use S3 to pass large payloads: upload to S3 and pass the object key to Lambda.
  2. 80% success Split the payload into smaller chunks and invoke Lambda multiple times, aggregating results client-side. 
    Split the payload into smaller chunks and invoke Lambda multiple times, aggregating results client-side.
  3. 85% success Use Lambda with a function URL or API Gateway, which can handle larger payloads (up to 10 MB) and stream data. 
    Use Lambda with a function URL or API Gateway, which can handle larger payloads (up to 10 MB) and stream data.

中文步骤

  1. 使用异步调用（Event 调用）支持最多 256 KB 负载，或使用 S3 传递大负载：上传到 S3 并将对象键传递给 Lambda。
  2. 将负载分成较小的块并多次调用 Lambda，在客户端聚合结果。
  3. 使用带有函数 URL 或 API Gateway 的 Lambda，可以处理更大的负载（最多 10 MB）并流式传输数据。

Dead Ends

Common approaches that don't work:

  1. Increase Lambda function timeout or memory 95% fail

    Timeout and memory limits affect execution, not the payload size limit; the API rejects before the function runs.

  2. Compress the payload with gzip but keep the same structure 60% fail

    Lambda Invoke API doesn't automatically decompress; the function receives compressed bytes, which may break parsing unless handled explicitly.