test: do not send Content-Length header for HEAD requests (#1771)

Author: mxschmitt

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

@@ -218,7 +218,7 @@ public void handle(HttpExchange exchange) throws IOException {
     }
     long contentLength = body.size();
     // -1 means no body, 0 means chunked encoding.
-    exchange.sendResponseHeaders(200, contentLength == 0 ? -1 : contentLength);
+    exchange.sendResponseHeaders(200, (contentLength == 0 || exchange.getRequestMethod().equals("HEAD")) ? -1 : contentLength);
     if (contentLength > 0) {
       exchange.getResponseBody().write(body.toByteArray());
     }

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

@@ -33,7 +33,6 @@ static boolean isChromiumHeadedLike() {
   @Test
   @DisabledIf(value="isChromiumHeadedLike", disabledReason="fail")
   void shouldFailWithoutCredentials() {
-    System.out.println("channel2 " + getBrowserChannelFromEnv());
     server.setAuth("/empty.html", "user", "pass");
     Response response = page.navigate(server.EMPTY_PAGE);
     assertEquals(401, response.status());

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

@@ -337,7 +337,7 @@ void shouldReturnBodyForFailingRequests() {
     for (String method : new String[] {"head", "put", "trace"}) {
       server.setRoute("/empty.html", exchange -> {
         exchange.getResponseHeaders().set("Content-type", "text/plain");
-        exchange.sendResponseHeaders(404, 10);
+        exchange.sendResponseHeaders(404, exchange.getRequestMethod().equals("HEAD") ? -1 : 10);
         try (Writer writer = new OutputStreamWriter(exchange.getResponseBody())) {
           writer.write("Not found.");
         }