diff --git a/content/browser/devtools/render_frame_devtools_agent_host.cc b/content/browser/devtools/render_frame_devtools_agent_host.cc
index d3fdf7590e697..46e51557d435a 100644
--- a/content/browser/devtools/render_frame_devtools_agent_host.cc
+++ b/content/browser/devtools/render_frame_devtools_agent_host.cc
@@ -437,6 +437,7 @@ bool RenderFrameDevToolsAgentHost::AttachSession(DevToolsSession* session) {
 #endif  // !BUILDFLAG(IS_ANDROID)
 
   if (sessions().empty()) {
+    LOG(ERROR) << "[POC] AttachSession -> UpdateRawHeadersAccess";
     UpdateRawHeadersAccess(frame_host_);
 #if BUILDFLAG(IS_ANDROID)
     GetWakeLock()->RequestWakeLock();
@@ -448,6 +449,7 @@ bool RenderFrameDevToolsAgentHost::AttachSession(DevToolsSession* session) {
 void RenderFrameDevToolsAgentHost::DetachSession(DevToolsSession* session) {
   // Destroying session automatically detaches in renderer.
   if (sessions().empty()) {
+    LOG(ERROR) << "[POC] DetachSession -> UpdateRawHeadersAccess (sessions now empty)";
     UpdateRawHeadersAccess(frame_host_);
 #if BUILDFLAG(IS_ANDROID)
     GetWakeLock()->CancelWakeLock();
diff --git a/services/network/network_service.cc b/services/network/network_service.cc
index 3989a72d732e1..198ceaff4ce8d 100644
--- a/services/network/network_service.cc
+++ b/services/network/network_service.cc
@@ -816,6 +816,12 @@ void NetworkService::SetRawHeadersAccess(
     network::RendererProcessId process_id,
     const std::vector<url::Origin>& origins) {
   DCHECK(process_id);
+  {
+    std::string s;
+    for (auto& o : origins) s += o.Serialize() + " ";
+    LOG(ERROR) << "[POC] SetRawHeadersAccess pid=" << process_id
+               << " origins(" << origins.size() << ")=[" << s << "]";
+  }
   if (!origins.size()) {
     raw_headers_access_origins_by_pid_.erase(process_id);
   } else {
diff --git a/services/network/websocket.cc b/services/network/websocket.cc
index 089e400af91ea..88715b914110f 100644
--- a/services/network/websocket.cc
+++ b/services/network/websocket.cc
@@ -115,6 +115,8 @@ mojom::WebSocketHandshakeResponsePtr ToMojo(
   std::string name, value;
   std::string headers_text =
       base::StrCat({response->headers->GetStatusLine(), "\r\n"});
+  LOG(ERROR) << "[POC] WebSocket ToMojo has_raw_headers_access="
+             << has_raw_headers_access;
   while (response->headers->EnumerateHeaderLines(&iter, &name, &value)) {
     if (has_raw_headers_access ||
         !net::HttpResponseHeaders::IsCookieResponseHeader(name)) {
diff --git a/third_party/blink/renderer/modules/websockets/websocket_channel_impl.cc b/third_party/blink/renderer/modules/websockets/websocket_channel_impl.cc
index f5344eee170f9..bcb2f1291889e 100644
--- a/third_party/blink/renderer/modules/websockets/websocket_channel_impl.cc
+++ b/third_party/blink/renderer/modules/websockets/websocket_channel_impl.cc
@@ -568,6 +568,10 @@ void WebSocketChannelImpl::OnConnectionEstablished(
   const String& extensions = response->extensions;
   DVLOG(1) << this << " OnConnectionEstablished(" << protocol << ", "
            << extensions << ")";
+  for (const auto& h : response->headers) {
+    LOG(ERROR) << "[POC][RENDERER] WS handshake header: " << h->name.Utf8()
+               << ": " << h->value.Utf8();
+  }
   DEVTOOLS_TIMELINE_TRACE_EVENT_INSTANT("WebSocketReceiveHandshakeResponse",
                                         InspectorWebSocketEvent::Data,
                                         execution_context_, identifier_);