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connect-go-reference

Reference the LOCAL connect-go/ directory for ConnectRPC protocol. NEVER use WebFetch/WebSearch for github.com/connectrpc/connect-go - always read local files.

personAuthor: jakexiaohubgithub
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connect-go-reference

Reference the LOCAL connect-go/ directory for understanding the ConnectRPC protocol.

CRITICAL: Use Local Files Only

NEVER fetch from GitHub. Do not use:

  • WebFetch with github.com/connectrpc/connect-go
  • WebFetch with raw.githubusercontent.com/.../connect-go
  • WebSearch for "connect-go" implementation details

ALWAYS use local files:

  • Read tool with connect-go/*.go paths
  • Grep tool with path="connect-go/"
  • Glob tool with path="connect-go/"

The connect-go/ directory at the repository root is the authoritative reference.

Instructions

The connect-go/ directory at the repository root contains the official Go implementation of the ConnectRPC protocol.

Setup (one-time only)

If the directory doesn't exist, clone it once:

git clone https://github.com/connectrpc/connect-go.git connect-go

After cloning, ALWAYS use the local files via Read/Grep/Glob tools.

Key Files Reference

| File | Purpose | |------|---------| | protocol_connect.go | Connect protocol implementation (unary + streaming) | | protocol_grpc.go | gRPC protocol implementation | | protocol.go | Protocol abstraction and detection | | envelope.go | Frame/envelope encoding (5-byte header) | | client.go | Client-side implementation | | handler.go | Server-side handler implementation | | client_stream.go | Client streaming logic | | handler_stream.go | Server streaming logic | | error.go | Error types and code mappings | | codec.go | Protobuf/JSON codec interfaces | | compression.go | Compression support (gzip, etc.) | | duplex_http_call.go | HTTP call abstraction for streaming | | option.go | Configuration options |

Usage Patterns

Protocol detection logic:

Read connect-go/protocol.go and connect-go/protocol_connect.go for Content-Type parsing

Streaming frame format:

Read connect-go/envelope.go for the 5-byte envelope format:
[flags: 1 byte][length: 4 bytes BE][payload]

Error handling:

Read connect-go/error.go for error codes, wire format, and detail encoding

gRPC trailers:

Read connect-go/protocol_grpc.go for grpc-status header and trailer handling

When to Use

  • Implementing new protocol features
  • Debugging wire format or encoding issues
  • Verifying correct behavior against reference
  • Understanding edge cases in streaming
  • Checking error code mappings

How to Use (Examples)

# Search for content-type handling
Grep pattern="Content-Type" path="connect-go/"

# Read specific file
Read file_path="connect-go/protocol_connect.go"

# Find all error-related code
Grep pattern="Code" path="connect-go/error.go"

FORBIDDEN:

  • WebFetch("https://github.com/connectrpc/connect-go/...") - NO
  • WebFetch("https://raw.githubusercontent.com/connectrpc/connect-go/...") - NO
  • WebSearch("connect-go ...") for implementation details - NO
  • Guessing behavior without reading local connect-go/*.go files - NO