fix: send x-playwright-browser (#844)

playwright/src/main/java/com/microsoft/playwright/impl/BrowserTypeImpl.java

@@ -64,6 +64,22 @@ class BrowserTypeImpl extends ChannelOwner implements BrowserType {
     // We don't use gson() here as the headers map should be serialized to a json object.
     JsonObject params = new Gson().toJsonTree(options).getAsJsonObject();
     params.addProperty("wsEndpoint", wsEndpoint);
+
+    if (!params.has("headers")) {
+      params.add("headers", new JsonObject());
+    }
+    JsonObject headers = params.get("headers").getAsJsonObject();
+    boolean foundBrowserHeader = false;
+    for (String name : headers.keySet()) {
+      if ("x-playwright-browser".equalsIgnoreCase(name)) {
+        foundBrowserHeader = true;
+        break;
+      }
+    }
+    if (!foundBrowserHeader) {
+      headers.addProperty("x-playwright-browser", name());
+    }
+
     JsonObject json = sendMessage("connect", params).getAsJsonObject();
     JsonPipe pipe = connection.getExistingObject(json.getAsJsonObject("pipe").get("guid").getAsString());
     Connection connection = new Connection(pipe);

playwright/src/test/java/com/microsoft/playwright/TestBrowserTypeConnect.java

@@ -32,8 +32,7 @@ import java.nio.file.Paths;
 import java.util.*;
 import java.util.stream.Collectors;
 
-import static com.microsoft.playwright.Utils.mapOf;
-import static com.microsoft.playwright.Utils.parseTrace;
+import static com.microsoft.playwright.Utils.*;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.Arrays.asList;
 import static org.junit.jupiter.api.Assertions.*;
@@ -166,6 +165,7 @@ public class TestBrowserTypeConnect extends TestBase {
       }
       assertNotNull(webSocketServer.lastClientHandshake);
       assertEquals("Playwright", webSocketServer.lastClientHandshake.getFieldValue("User-Agent"));
+      assertEquals(browserType.name(), webSocketServer.lastClientHandshake.getFieldValue("x-playwright-browser"));
       assertEquals("bar", webSocketServer.lastClientHandshake.getFieldValue("foo"));
     }
   }