From aaa3f2cdf90bede466e3f6976ff3479537101f65 Mon Sep 17 00:00:00 2001
From: Palak Jha <palakjha916@gmail.com>
Date: Fri, 24 Apr 2026 12:18:15 +0530
Subject: [PATCH] feat: support gRPC-Web on frontend gRPC server (#8027)

feat: add gRPC-Web support using tonic-web

Signed-off-by: polar <palakjha916@gmail.com>
---
 .gitignore              |  1 +
 Cargo.lock              | 19 +++++++++++++++++++
 src/servers/Cargo.toml  |  1 +
 src/servers/src/grpc.rs |  6 +++++-
 4 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 1e6194369f..7885340245 100644
--- a/.gitignore
+++ b/.gitignore
@@ -74,3 +74,4 @@ AGENTS.md
 
 # local design docs
 docs/specs/
+.vs/ 
diff --git a/Cargo.lock b/Cargo.lock
index a006c7403c..92422004e4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -12118,6 +12118,7 @@ dependencies = [
  "tokio-util",
  "tonic 0.14.2",
  "tonic-reflection",
+ "tonic-web",
  "tower 0.5.2",
  "tower-http 0.6.6",
  "tracing",
@@ -14102,6 +14103,24 @@ dependencies = [
  "tonic-prost",
 ]
 
+[[package]]
+name = "tonic-web"
+version = "0.14.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29453d84de05f4f1b573db22e6f9f6c95c189a6089a440c9a098aa9dea009299"
+dependencies = [
+ "base64 0.22.1",
+ "bytes",
+ "http 1.3.1",
+ "http-body 1.0.1",
+ "pin-project",
+ "tokio-stream",
+ "tonic 0.14.2",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+]
+
 [[package]]
 name = "tower"
 version = "0.4.13"
diff --git a/src/servers/Cargo.toml b/src/servers/Cargo.toml
index 7d8c01f048..d82e607f0e 100644
--- a/src/servers/Cargo.toml
+++ b/src/servers/Cargo.toml
@@ -133,6 +133,7 @@ tokio-stream = { workspace = true, features = ["net"] }
 tokio-util.workspace = true
 tonic.workspace = true
 tonic-reflection = "0.14"
+tonic-web = "0.14"
 tower = { workspace = true, features = ["full"] }
 tower-http = { version = "0.6", features = ["full"] }
 tracing.workspace = true
diff --git a/src/servers/src/grpc.rs b/src/servers/src/grpc.rs
index ab4caafc34..43a066e423 100644
--- a/src/servers/src/grpc.rs
+++ b/src/servers/src/grpc.rs
@@ -355,7 +355,11 @@ impl Server for GrpcServer {
             .layer(MetricsMiddlewareLayer)
             .into_inner();
 
-        let mut builder = tonic::transport::Server::builder().layer(metrics_layer);
+        let mut builder = tonic::transport::Server::builder()
+            .accept_http1(true)
+            .layer(metrics_layer)
+            .layer(tonic_web::GrpcWebLayer::new());
+
         if let Some(tls_config) = self.tls_config.clone() {
             builder = builder.tls_config(tls_config).context(StartGrpcSnafu)?;
         }