Tizen TV 4.0 and 4.5 Web App Signalr not connect

Smart TV
1

I developed a web application with ReactJs and installed the same application as a tizen tv widget. I am establishing longpolling connection with SignalR on remote server. It works on version 5.5 of the browser and emulator, but not 4.0 and 4.5 on a real device. In versions 4.0 and 4.5, it sends a request for connection, but I do not get an error. I don’t see a problem with Tizen and Samsung permissions. It is stated in the documents that 4.0 and above support socket connection. I couldn’t tell the difference between the two versions.

<?xml version="1.0" encoding="UTF-8"?> <widget xmlns:tizen="http://tizen.org/ns/widgets" xmlns="http://www.w3.org/ns/widgets" id="http://yourdomain/ReactEmpty" version="0.2.1" viewmodes="maximized">
<tizen:application id="n5YnSlcGyE.ReactPanel" package="n5YnSlcGyE" required_version="2.3"/>
<content src="index.html"/>
<feature name="http://tizen.org/feature/screen.size.normal.1080.1920"/>
<feature name="http://www.samsungdforum.com/feature/Mouse"/>
<icon src="icon.png"/>
<tizen:metadata key="http://samsung.com/tv/metadata/prelaunch.support" value="true"/>
<name>ReactPanel</name>
<tizen:privilege name="http://developer.samsung.com/privilege/contentsdownload"/>
<tizen:privilege name="http://developer.samsung.com/privilege/network.public"/>
<tizen:privilege name="http://developer.samsung.com/privilege/productinfo"/>
<tizen:privilege name="http://developer.samsung.com/privilege/widgetdata"/>
<tizen:privilege name="http://tizen.org/privilege/application.launch"/>
<tizen:privilege name="http://tizen.org/privilege/internet"/>
<tizen:privilege name="http://tizen.org/privilege/push"/>
<tizen:privilege name="http://tizen.org/privilege/tv.inputdevice"/>
<tizen:privilege name="http://tizen.org/privilege/unlimitedstorage"/>
<tizen:profile name="tv-samsung"/>
<access origin="*" subdomains="true"/>
<tizen:setting screen-orientation="landscape" context-menu="enable" background-support="disable" encryption="disable" install-location="auto" hwkey-event="enable"/></widget>

Build methods:

"tizen-build": "rm -rf build && craco build && cp tizen/* build && tizen build-web -- build && tizen package -t wgt -s thisSignatureName -- build/.buildResult",
"tizen-deploy": "tizen install -n ReactPanel.wgt -- build/.buildResult",
"tizen-full-deploy": "yarn tizen-build && tizen install -n ReactPanel.wgt -- build/.buildResult"