GrpcChannel rewrites path with method.FullName

[WizMe-M]

What version of gRPC and what language are you using?

I'm using .NET 9 C# 14 with gRPC lib: Grpc.Net.Client version 2.70.0

What operating system (Linux, Windows,...) and version?

Windows 11 Pro

What runtime / compiler are you using (e.g. .NET Core SDK version dotnet --info)

.NET SDK:
 Version:           9.0.304
 Commit:            f12f5f689e
 Workload version:  9.0.300-manifests.407ced12
 MSBuild version:   17.14.16+5d8159c5f

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.26100
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Program Files\dotnet\sdk\9.0.304\

.NET workloads installed:
 [maui]
   Installation Source: SDK 9.0.300
   Manifest Version:    9.0.82/9.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\9.0.100\microsoft.net.sdk.maui\9.0.82\WorkloadManifest.json
   Install Type:              Msi

Configured to use loose manifests when installing new manifests.

Host:
  Version:      9.0.8
  Architecture: x64
  Commit:       aae90fa090

.NET SDKs installed:
  5.0.416 [C:\Program Files\dotnet\sdk]
  6.0.428 [C:\Program Files\dotnet\sdk]
  8.0.119 [C:\Program Files\dotnet\sdk]
  9.0.106 [C:\Program Files\dotnet\sdk]
  9.0.109 [C:\Program Files\dotnet\sdk]
  9.0.304 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.19 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 9.0.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.19 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 9.0.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 8.0.19 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 9.0.8 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  x86   [C:\Program Files (x86)\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

What did you do?

My case is doing gRPC request to the backend service through proxy.

I'm making GrpcChannel like this:

GrpcChannel.ForAddress("https://<ip>:<port>/backend/<service>");

Part /backend/<service> is required cause that's nginx rule mapping service by its name. So, making proxy call to https://proxy:5555/backend/service/v1.Service/Method I'm really doing call to https://service:5555/v1.Service/Method.

What did you expect to see?

Not rewriting proxy-path or an option to prepend it to method.FullName

What did you see instead?

So what's wrong?

In this code segment:
https://github.com/grpc/grpc-dotnet/blob/f4148e8833dcedf8ef13b0817c0fc1c036921f7e/src/Grpc.Net.Client/GrpcChannel.cs#L583C1-L584C43

It rewrites my proxy path /backend/service just to /v1.Service/Method

Anything else we should know about your project / environment?