grpcreflect

connectrpc.com/grpcreflect adds support for gRPC's server reflection API to any net/http server — including those built with Connect. With server reflection enabled, ad-hoc debugging tools can call your gRPC-compatible handlers and print the responses without a copy of the schema.

The exposed reflection API is wire compatible with Google's gRPC implementations, so it works with grpcurl, grpcui, and many other tools.

For more on Connect, see the announcement blog post, the documentation on connectrpc.com (especially the Getting Started guide for Go), the Connect repo, or the demo service.

Example

package main

import (
  "net/http"

  "golang.org/x/net/http2"
  "golang.org/x/net/http2/h2c"
  "connectrpc.com/grpcreflect"
)

func main() {
  mux := http.NewServeMux()
  reflector := grpcreflect.NewStaticReflector(
    "acme.user.v1.UserService",
    "acme.group.v1.GroupService",
    // protoc-gen-connect-go generates package-level constants
    // for these fully-qualified protobuf service names, so you'd more likely
    // reference userv1.UserServiceName and groupv1.GroupServiceName.
  )
  mux.Handle(grpcreflect.NewHandlerV1(reflector))
  // Many tools still expect the older version of the server reflection API, so
  // most servers should mount both handlers.
  mux.Handle(grpcreflect.NewHandlerV1Alpha(reflector))
  // If you don't need to support HTTP/2 without TLS (h2c), you can drop
  // x/net/http2 and use http.ListenAndServeTLS instead.
  http.ListenAndServe(
    ":8080",
    h2c.NewHandler(mux, &http2.Server{}),
  )
}

Status: Stable

This module is stable. It supports:

• The three most recent major releases of Go. Keep in mind that only the last two releases receive security patches.
• APIv2 of Protocol Buffers in Go (google.golang.org/protobuf).

Within those parameters, grpcreflect follows semantic versioning. We will not make breaking changes in the 1.x series of releases.

Legal

Offered under the Apache 2 license.