Скачать или смотреть Resolving connect() Issues in NativeScript-SocketIO After Upgrading to NS8

Discover how to solve `connect()` problems in NativeScript-SocketIO after upgrading to NS8, including fixing CORS policy issues.
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This video is based on the question https://stackoverflow.com/q/72348282/ asked by the user 'tagak' ( https://stackoverflow.com/u/19180168/ ) and on the answer https://stackoverflow.com/a/72353534/ provided by the user 'tagak' ( https://stackoverflow.com/u/19180168/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving connect() Issues in NativeScript-SocketIO After Upgrading to NS8

Upgrading a project can sometimes lead to unexpected challenges, especially when it comes to third-party libraries. One common issue that developers encounter is the inability to establish a connection with Socket.IO after upgrading to NativeScript 8 (NS8) and migrating to @triniwiz/nativescript-socketio. In this article, we’ll explore why this issue occurs and how to resolve it so you can get back to building your application seamlessly.

The Problem: Unable to Connect

After upgrading your project, you might find that your Socket.IO connection fails without any visible error messages. You try the following code snippet in your app.js:

[[See Video to Reveal this Text or Code Snippet]]

You observe that the server does not respond, leaving you baffled, especially when your server operates perfectly with other Socket.IO clients and even responds to direct curl requests.

The Issue

The probable cause of this issue lies in using the http protocol. Modern applications often implement strict security measures—especially when using https—thus enforcing a CORS (Cross-Origin Resource Sharing) policy that can inadvertently block connections made over http.

The Solution

Fortunately, this issue can be resolved with a minor adjustment to your Android app's manifest file. By allowing clear-text traffic (i.e., using http), your application will be able to communicate with the server properly. Here’s how you can do it:

Step-by-Step Guide

Locate the AndroidManifest.xml file in your NativeScript project.

Update your <application> tag to include the android:usesCleartextTraffic="true" attribute.

Your AndroidManifest.xml Will Change From:

[[See Video to Reveal this Text or Code Snippet]]

To:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By adjusting the AndroidManifest.xml to allow clear-text traffic, you provide your NativeScript application the ability to connect to Socket.IO over http. This solution successfully bypasses the previous CORS issue, allowing your connection to function as intended.

If you encounter any further issues, ensure that your server is up and running correctly and monitor for any more error messages that could provide additional insights. Happy coding!