diff --git a/misk-actions/src/main/kotlin/misk/web/actions/WebSocket.kt b/misk-actions/src/main/kotlin/misk/web/actions/WebSocket.kt
index 9c7ab93f780..40e637795aa 100644
--- a/misk-actions/src/main/kotlin/misk/web/actions/WebSocket.kt
+++ b/misk-actions/src/main/kotlin/misk/web/actions/WebSocket.kt
@@ -39,14 +39,14 @@ interface WebSocket {
    * Returns the size in bytes of all messages enqueued to be transmitted to the server. This
    * doesn't include framing overhead. It also doesn't include any bytes buffered by the operating
    * system or network intermediaries. This method returns 0 if no messages are waiting
-   * in the queue. If may return a nonzero value after the web socket has been canceled; this
+   * in the queue. It may return a nonzero value after the web socket has been canceled; this
    * indicates that enqueued messages were not transmitted.
    */
   fun queueSize(): Long
 
   /**
-   * Attempts to enqueue {@code text} to be UTF-8 encoded and sent as a the data of a text (type
-   * {@code 0x1}) message.
+   * Attempts to enqueue {@code bytes} to be sent as the data of a binary (type {@code 0x2})
+   * message.
    *
    * <p>This method returns true if the message was enqueued. Messages that would overflow the
    * outgoing message buffer will be rejected and trigger a {@linkplain #close graceful shutdown} of
@@ -58,8 +58,8 @@ interface WebSocket {
   fun send(bytes: ByteString): Boolean
 
   /**
-   * Attempts to enqueue {@code bytes} to be sent as a the data of a binary (type {@code 0x2})
-   * message.
+   * Attempts to enqueue {@code text} to be UTF-8 encoded and sent as the data of a text (type
+   * {@code 0x1}) message.
    *
    * <p>This method returns true if the message was enqueued. Messages that would overflow the
    * outgoing message buffer will be rejected and trigger a {@linkplain #close graceful shutdown} of
diff --git a/misk-testing/src/main/kotlin/misk/web/FakeWebSocketListener.kt b/misk-testing/src/main/kotlin/misk/web/FakeWebSocketListener.kt
index 223449f31bc..f6a84054f13 100644
--- a/misk-testing/src/main/kotlin/misk/web/FakeWebSocketListener.kt
+++ b/misk-testing/src/main/kotlin/misk/web/FakeWebSocketListener.kt
@@ -1,14 +1,22 @@
 package misk.web
 
+import okhttp3.WebSocket
+import okio.ByteString
 import java.util.concurrent.LinkedBlockingDeque
 import java.util.concurrent.TimeUnit
 
 class FakeWebSocketListener : okhttp3.WebSocketListener() {
   val messages = LinkedBlockingDeque<String>()
+  val binaryMessages = LinkedBlockingDeque<ByteString>()
 
   override fun onMessage(webSocket: okhttp3.WebSocket, text: String) {
     messages.add(text)
   }
 
+  override fun onMessage(webSocket: WebSocket, bytes: ByteString) {
+    binaryMessages.add(bytes)
+  }
+
   fun takeMessage() = messages.pollFirst(2, TimeUnit.SECONDS)
+  fun takeBinaryMessage() = binaryMessages.pollFirst(2, TimeUnit.SECONDS)
 }
diff --git a/misk/src/main/kotlin/misk/web/jetty/JettyWebSocket.kt b/misk/src/main/kotlin/misk/web/jetty/JettyWebSocket.kt
index d40ce203d57..59a2c3206e0 100644
--- a/misk/src/main/kotlin/misk/web/jetty/JettyWebSocket.kt
+++ b/misk/src/main/kotlin/misk/web/jetty/JettyWebSocket.kt
@@ -25,11 +25,21 @@ internal class JettyWebSocket(
   val response: JettyServerUpgradeResponse
 ) : WebSocket {
 
+  internal sealed interface Message {
+    val byteCount: Long
+    data class Text(val text: String) : Message {
+      override val byteCount = text.utf8Size()
+    }
+    data class Binary(val data: ByteString) : Message {
+      override val byteCount = data.size.toLong()
+    }
+  }
+
   /** Total size of messages enqueued and not yet transmitted by Jetty. */
   private var outgoingQueueSize = 0L
 
   /** Messages to send when the Web Socket connects. */
-  private var queue = ArrayDeque<String>()
+  private var queue = ArrayDeque<Message>()
 
   /** Application's listener to notify of incoming messages from the client. */
   private var listener: WebSocketListener? = null
@@ -93,14 +103,22 @@ internal class JettyWebSocket(
   }
 
   override fun send(text: String): Boolean {
-    val byteCount = text.utf8Size()
+    return enqueue(Message.Text(text))
+  }
+
+  override fun send(bytes: ByteString): Boolean {
+    return enqueue(Message.Binary(bytes))
+  }
+
+  private fun enqueue(message: Message): Boolean {
+    val byteCount = message.byteCount
     if (outgoingQueueSize + byteCount > MAX_QUEUE_SIZE) {
       close(1001, null)
       return false
     }
 
     outgoingQueueSize += byteCount
-    queue.add(text)
+    queue.add(message)
     sendQueue()
 
     return true
@@ -108,26 +126,32 @@ internal class JettyWebSocket(
 
   private fun sendQueue() {
     while (adapter.isConnected && queue.isNotEmpty()) {
-      val text = queue.pop()
-      val byteCount = text.utf8Size()
-
-      adapter.remote.sendString(
-        text,
-        object : WriteCallback {
-          override fun writeSuccess() {
-            outgoingQueueSize -= byteCount
-          }
-
-          override fun writeFailed(x: Throwable?) {
-            outgoingQueueSize -= byteCount
-          }
+      val message = queue.pop()
+      val byteCount = message.byteCount
+      val callback = object : WriteCallback {
+        override fun writeSuccess() {
+          outgoingQueueSize -= byteCount
         }
-      )
-    }
-  }
 
-  override fun send(bytes: ByteString): Boolean {
-    TODO()
+        override fun writeFailed(x: Throwable?) {
+          outgoingQueueSize -= byteCount
+        }
+      }
+      when (message) {
+        is Message.Text -> {
+          adapter.remote.sendString(
+            message.text,
+            callback
+          )
+        }
+        is Message.Binary -> {
+          adapter.remote.sendBytes(
+            message.data.asByteBuffer(),
+            callback
+          )
+        }
+      }
+    }
   }
 
   override fun close(code: Int, reason: String?): Boolean {
@@ -167,7 +191,7 @@ internal class JettyWebSocket(
         it.match(DispatchMechanism.WEBSOCKET, null, listOf(), httpCall.url)
       }
 
-      val bestAction = candidateActions.sorted().firstOrNull() ?: return null
+      val bestAction = candidateActions.minOrNull() ?: return null
       bestAction.action.scopeAndHandle(request.httpServletRequest, httpCall, bestAction.pathMatcher)
       return realWebSocket.adapter
     }
diff --git a/misk/src/test/kotlin/misk/web/WebSocketsTest.kt b/misk/src/test/kotlin/misk/web/WebSocketsTest.kt
index 8cffbf60616..d5379827ac7 100644
--- a/misk/src/test/kotlin/misk/web/WebSocketsTest.kt
+++ b/misk/src/test/kotlin/misk/web/WebSocketsTest.kt
@@ -1,5 +1,6 @@
 package misk.web
 
+import com.squareup.protos.test.parsing.Warehouse
 import misk.MiskTestingServiceModule
 import misk.inject.KAbstractModule
 import misk.logging.LogCollectorModule
@@ -19,6 +20,7 @@ import org.junit.jupiter.api.Test
 import misk.logging.LogCollector
 import jakarta.inject.Inject
 import jakarta.inject.Singleton
+import okio.ByteString
 
 @MiskTest(startService = true)
 internal class WebSocketsTest {
@@ -50,6 +52,30 @@ internal class WebSocketsTest {
     )
   }
 
+  @Test
+  fun binaryWebSocket() {
+    val client = OkHttpClient()
+
+    val request = Request.Builder()
+      .url(jettyService.httpServerUrl.resolve("/echo")!!)
+      .build()
+
+    val webSocket = client.newWebSocket(request, listener)
+    val warehouse = Warehouse.Builder()
+      .warehouse_token("WH_1")
+      .warehouse_id(42)
+      .build()
+
+    webSocket.send(warehouse.encodeByteString())
+
+    val expected = Warehouse.Builder()
+      .warehouse_token("ACK WH_1")
+      .warehouse_id(43)
+      .build()
+    val actual = listener.takeBinaryMessage()?.let { Warehouse.ADAPTER.decode(it) }
+    assertEquals(actual, expected)
+  }
+
   @Test
   fun loggingDisabledByEnv() {
     val client = OkHttpClient()
@@ -87,6 +113,17 @@ class EchoWebSocket @Inject constructor() : WebAction {
         webSocket.send("ACK $text")
       }
 
+      override fun onMessage(webSocket: WebSocket, bytes: ByteString) {
+        val message = Warehouse.ADAPTER.decode(bytes)
+        webSocket.send(
+          message.newBuilder()
+            .warehouse_token("ACK ${message.warehouse_token}")
+            .warehouse_id(message.warehouse_id + 1)
+            .build()
+            .encodeByteString()
+        )
+      }
+
       override fun toString() = "EchoListener"
     }
   }