grpc resource_error ai_generated true

INTERNAL: grpc: received metadata size exceeds limit

ID: grpc/metadata-too-large

Also available as: JSON · Markdown · 中文
82%Fix Rate
87%Confidence
1Evidence
2024-03-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
gRPC C++ 1.55+ active — — —
gRPC Java 1.55+ active — — —
gRPC .NET 2.50+ active — — —

Root Cause

The gRPC metadata (headers/trailers) sent with an RPC exceeds the default size limit (usually 8 KB), often due to large authentication tokens or custom headers.

generic

中文

gRPC元数据（头部/尾部）的大小超过了默认限制（通常为8 KB），通常是由于大型身份验证令牌或自定义头部导致。

Official Documentation

https://grpc.io/docs/guides/performance/

Workarounds

  1. 90% success Increase max metadata size on both client and server. In C++ server: builder.AddChannelArgument(GRPC_ARG_MAX_METADATA_SIZE, 16384); On client: grpc.InsecureChannelCredentials().SetMaxMetadataSize(16384) 
    Increase max metadata size on both client and server. In C++ server: builder.AddChannelArgument(GRPC_ARG_MAX_METADATA_SIZE, 16384); On client: grpc.InsecureChannelCredentials().SetMaxMetadataSize(16384)
  2. 85% success Move large data (e.g., tokens) to the message body instead of metadata. In Go: send token as first field in protobuf message and extract on server side. 
    Move large data (e.g., tokens) to the message body instead of metadata. In Go: send token as first field in protobuf message and extract on server side.

中文步骤

  1. Increase max metadata size on both client and server. In C++ server: builder.AddChannelArgument(GRPC_ARG_MAX_METADATA_SIZE, 16384); On client: grpc.InsecureChannelCredentials().SetMaxMetadataSize(16384)
  2. Move large data (e.g., tokens) to the message body instead of metadata. In Go: send token as first field in protobuf message and extract on server side.

Dead Ends

Common approaches that don't work:

  1. Increasing max metadata size on client only 45% fail

    Server still enforces its own limit; the error may persist if server limit is not also increased.

  2. Removing all custom headers 30% fail

    May break authentication or routing logic that depends on headers.