Use 'GET' verb when making calls to retrieve the ICE Config

Bug: 325448647
Change-Id: Id0656bd7ef40d2f8ef72d857200d9150978b6401
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5949584
Reviewed-by: Gary Kacmarcik <garykac@chromium.org>
Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
Auto-Submit: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1379340}

remoting/base/cloud_service_client.cc

@@ -279,8 +279,6 @@ using ProvisionGceInstanceRequest =
 using Empty = google::internal::remoting::cloud::v1alpha::Empty;
 using GenerateHostTokenRequest =
     google::internal::remoting::cloud::v1alpha::GenerateHostTokenRequest;
-using GenerateIceConfigRequest =
-    google::internal::remoting::cloud::v1alpha::GenerateIceConfigRequest;
 using ReauthorizeHostRequest =
     google::internal::remoting::cloud::v1alpha::ReauthorizeHostRequest;
 using RemoteAccessHost =
@@ -433,9 +431,8 @@ void CloudServiceClient::GenerateIceConfig(GenerateIceConfigCallback callback) {
   constexpr char path[] = "/v1alpha/networkTraversal:generateIceConfig";
 
   ExecuteRequest(kGenerateIceConfigTrafficAnnotation, path, /*api_key=*/"",
-                 net::HttpRequestHeaders::kPostMethod,
-                 std::make_unique<GenerateIceConfigRequest>(),
-                 std::move(callback));
+                 net::HttpRequestHeaders::kGetMethod,
+                 /*request_config=*/nullptr, std::move(callback));
 }
 
 void CloudServiceClient::VerifySessionToken(

remoting/base/protobuf_http_client.cc

@@ -133,9 +133,15 @@ void ProtobufHttpClient::DoExecuteRequest(
   if (!timeout_duration.is_zero()) {
     send_url_loader->SetTimeoutDuration(request->GetRequestTimeoutDuration());
   }
-  send_url_loader->AttachStringForUpload(
-      request->config().request_message->SerializeAsString(),
-      "application/x-protobuf");
+  if (request->config().method != net::HttpRequestHeaders::kGetMethod &&
+      request->config().method != net::HttpRequestHeaders::kHeadMethod) {
+    send_url_loader->AttachStringForUpload(
+        request->config().request_message->SerializeAsString(),
+        "application/x-protobuf");
+  } else {
+    // GET and HEAD requests cannot have content in the message body.
+    CHECK(!request->config().request_message);
+  }
   send_url_loader->SetAllowHttpErrorResults(true);
   auto* unowned_request = request.get();
   base::OnceClosure invalidator = base::BindOnce(

remoting/base/protobuf_http_request_config.cc

@@ -15,7 +15,11 @@ ProtobufHttpRequestConfig::ProtobufHttpRequestConfig(
 ProtobufHttpRequestConfig::~ProtobufHttpRequestConfig() = default;
 
 void ProtobufHttpRequestConfig::Validate() const {
-  DCHECK(request_message);
+  // If the method is GET or HEAD, |request_message| must not be set. For any
+  // other method, |request_message| must be valid.
+  DCHECK((request_message != nullptr) ==
+         (method != net::HttpRequestHeaders::kGetMethod &&
+          method != net::HttpRequestHeaders::kHeadMethod));
   DCHECK(!path.empty());
 }