diff --git a/test/browser_reporting.js b/test/browser_reporting.js
index 972d4ba52ce53..7b49b5242b600 100644
--- a/test/browser_reporting.js
+++ b/test/browser_reporting.js
@@ -1,5 +1,5 @@
 // Set this to true to have stdout and stderr sent back to the server
-var captureStdio = false;
+var captureStdio = true;
 
 var hasModule = typeof Module === 'object' && Module;
 
diff --git a/test/common.py b/test/common.py
index beb266d2d0021..a9e798fe69e80 100644
--- a/test/common.py
+++ b/test/common.py
@@ -2129,6 +2129,8 @@ def do_POST(self):
         self.end_headers()
       else:
         print(f'do_POST: unexpected POST: {urlinfo}')
+        self.send_response(404)
+        self.end_headers()
 
     def do_GET(self):
       info = urlparse(self.path)
diff --git a/tools/link.py b/tools/link.py
index 3ea4285d5985c..c471f77a2d417 100644
--- a/tools/link.py
+++ b/tools/link.py
@@ -797,7 +797,7 @@ def phase_linker_setup(options, linker_args):  # noqa: C901, PLR0912, PLR0915
   def limit_incoming_module_api():
     if options.oformat == OFormat.HTML and options.shell_path == DEFAULT_SHELL_HTML:
       # Out default shell.html file has minimal set of INCOMING_MODULE_JS_API elements that it expects
-      default_setting('INCOMING_MODULE_JS_API', 'canvas,monitorRunDependencies,onAbort,onExit,print,setStatus'.split(','))
+      default_setting('INCOMING_MODULE_JS_API', 'canvas,monitorRunDependencies,onAbort,onExit,print,printErr,setStatus'.split(','))
     else:
       default_setting('INCOMING_MODULE_JS_API', [])