protoc-gen fails silently

[sarathsp06]

🐛 Bug Report

protoc-gen fails silently if the rpc request object is missing some fields

To Reproduce

Create a rpc method with path indicating that it needs N parameters but the request object is missing some

Following example needs clinic_id ,patient_id, order_id but has only clinic_id. It silently fails }

rpc GetOrder(GetOrderRequest) returns (GetOrderResponse) {
    option (google.api.http) = {get: "/v1/clinics/{clinic_id}/patients/{patient_id}/orders/{order_id}"};
    option (openapi.v3.operation) = {
      security: []
      responses: {
        response_or_reference: [
          {
            name: "400"
            value: {
              reference: {_ref: "#/components/responses/BadRequest"}
            }
          }
        ]
      }
    };
  }
.
.
.
message GetOrderRequest {
  string clinic_id = 1;
}

Expected behavior

Fail with error

Actual Behavior

Fail to create the .pb.pw.go file

Your Environment

› go version 
go version go1.24.3 darwin/arm64
› uname -a
Darwin local.local 24.5.0 Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:29 PDT 2025; root:xnu-11417.121.6~2/RELEASE_ARM64_T6030 arm64

[johanbrandhorst]

I tried this out locally and I get an error:

Failure: plugin protoc-gen-grpc-gateway: no field "patient_id" found in GetOrderRequest

Could you share an example repo showing the problem?

[iamrajiv]

@sarathsp06 your http path has 3 parameters {clinic_id}, {patient_id}, {order_id} but your GetOrderRequest message only defines clinic_id adding the missing fields to your request message should fix this

[johanbrandhorst]

I'm going to close this since it seems like it was a user error, please let me know if this issue persists!