diff --git a/Sources/Compute/IncomingRequest.swift b/Sources/Compute/IncomingRequest.swift
index 0fb7c571..1e4957c7 100644
--- a/Sources/Compute/IncomingRequest.swift
+++ b/Sources/Compute/IncomingRequest.swift
@@ -66,6 +66,14 @@ public struct IncomingRequest: Sendable {
             return .localhost
         }
     }
+}
+
+extension IncomingRequest {
+
+    public enum UpgradeWebsocketBehavior {
+        case proxy
+        case fanout
+    }
 
     public func isUpgradeWebsocketRequest() -> Bool {
         let connection = headers[.connection, default: ""].lowercased()
@@ -73,7 +81,12 @@ public struct IncomingRequest: Sendable {
         return connection.contains("upgrade") && upgrade.contains("websocket")
     }
 
-    public func upgradeWebsocket(backend: String) throws {
-        try request.upgradeWebsocket(backend: backend)
+    public func upgradeWebsocket(backend: String, behavior: UpgradeWebsocketBehavior) throws {
+        switch behavior {
+        case .proxy:
+            try request.redirectToWebsocketProxy(backend: backend)
+        case .fanout:
+            try request.redirectToGripProxy(backend: backend)
+        }
     }
 }
diff --git a/Sources/Compute/Runtime/Request.swift b/Sources/Compute/Runtime/Request.swift
index 8238cf7b..dfcd612f 100644
--- a/Sources/Compute/Runtime/Request.swift
+++ b/Sources/Compute/Runtime/Request.swift
@@ -155,8 +155,12 @@ public struct Request: Sendable {
         try wasi(fastly_http_req__framing_headers_mode_set(handle, newValue.rawValue))
     }
 
-    public func upgradeWebsocket(backend: String) throws {
-        try wasi(fastly_http_req__upgrade_websocket(backend, backend.utf8.count))
+    public func redirectToWebsocketProxy(backend: String) throws {
+        try wasi(fastly_http_req__redirect_to_websocket_proxy(backend, backend.utf8.count))
+    }
+
+    public func redirectToGripProxy(backend: String) throws {
+        try wasi(fastly_http_req__redirect_to_grip_proxy(backend, backend.utf8.count))
     }
 }
 
diff --git a/Sources/Compute/Runtime/Stubs.swift b/Sources/Compute/Runtime/Stubs.swift
index 18e326b1..9ca0dade 100644
--- a/Sources/Compute/Runtime/Stubs.swift
+++ b/Sources/Compute/Runtime/Stubs.swift
@@ -124,7 +124,9 @@ func fastly_http_req__auto_decompress_response_set(_ req_handle: WasiHandle, _ e
 
 func fastly_http_req__framing_headers_mode_set(_ req_handle: WasiHandle, _ mode: UInt32) -> Int32 { fatalError() }
 
-func fastly_http_req__upgrade_websocket(_ backend: UnsafePointer<CChar>!, _ backend_len: Int) -> Int32 { fatalError() }
+func fastly_http_req__redirect_to_websocket_proxy(_ backend: UnsafePointer<CChar>!, _ backend_len: Int) -> Int32 { fatalError() }
+
+func fastly_http_req__redirect_to_grip_proxy(_ backend: UnsafePointer<CChar>!, _ backend_len: Int) -> Int32 { fatalError() }
 
 func fastly_http_req__register_dynamic_backend(_ name: UnsafePointer<CChar>!, _ name_len: Int, _ target: UnsafePointer<CChar>!, _ target_len: Int, _ backend_config_mask: UInt32, _ backend_configuration: UnsafeMutablePointer<DynamicBackendConfig>!) -> Int32 { fatalError() }
 
diff --git a/Sources/ComputeRuntime/include/ComputeRuntime.h b/Sources/ComputeRuntime/include/ComputeRuntime.h
index ad91c98f..eea521f3 100644
--- a/Sources/ComputeRuntime/include/ComputeRuntime.h
+++ b/Sources/ComputeRuntime/include/ComputeRuntime.h
@@ -191,8 +191,11 @@ int fastly_http_req__pending_req_select(WasiHandle req_handles[], size_t req_han
 WASM_IMPORT("fastly_http_req", "framing_headers_mode_set")
 int fastly_http_req__framing_headers_mode_set(WasiHandle req_handle, uint32_t mode);
 
-WASM_IMPORT("fastly_http_req", "upgrade_websocket")
-int fastly_http_req__upgrade_websocket(const char *backend, size_t backend_len);
+WASM_IMPORT("fastly_http_req", "redirect_to_websocket_proxy")
+int fastly_http_req__redirect_to_websocket_proxy(const char *backend, size_t backend_len);
+
+WASM_IMPORT("fastly_http_req", "redirect_to_grip_proxy")
+int fastly_http_req__redirect_to_grip_proxy(const char *backend, size_t backend_len);
 
 WASM_IMPORT("fastly_http_req", "register_dynamic_backend")
 int fastly_http_req__register_dynamic_backend(const char *name,