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Learn how to fix the `406 Not Acceptable` error in Android Volley requests by properly setting request headers. Follow this guide for a step-by-step solution.
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This video is based on the question https://stackoverflow.com/q/64914534/ asked by the user 'DevOpsSauce' ( https://stackoverflow.com/u/4522447/ ) and on the answer https://stackoverflow.com/a/64916963/ provided by the user 'Nicola Gallazzi' ( https://stackoverflow.com/u/6275174/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting the 406 Not Acceptable Error in Android Volley Requests

When developing Android applications that make use of REST APIs, you may stumble upon the 406 Not Acceptable error while performing network requests. This particular error indicates an issue with headers sent along with your request. In this post, we will explore how to diagnose and fix this error in the context of Android's Volley library.

Understanding the 406 Not Acceptable Error

The 406 status code in HTTP is defined as "Not Acceptable". This error means that the server cannot generate a response that meets the criteria specified in the request's Accept headers. In simple terms, the server is saying that it can't provide the data in a format you are asking for, typically due to an incorrect or missing request header.

In the example scenario with a REST API where the curl request works successfully but the Volley request fails, it is essential to ensure that all necessary request headers are provided accurately in the Volley request.

The Problem: Inconsistent Headers

When translating your working curl command into a Volley request, it appears that the headers needed for a successful response are not being set correctly. Here's an overview of the wrong approach and how to revise it.

The Existing Volley Request Code

In your original code, it incorrectly attempted to include essential headers (like Content-Type, Auth-Token, and detail) directly in the JSON object. Here's a simplified snippet of the faulty part:

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

The Solution: Properly Setting Request Headers

To resolve the issue, you'll need to override the getHeaders() method in your JsonObjectRequest. This is where you can set the headers correctly. Here’s how to do it:

Step 1: Extend the JsonObjectRequest

Define a new class that extends JsonObjectRequest:

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

Step 2: Create the Request with Headers

When creating the request, define your headers in a HashMap and send them along with your request like so:

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

Conclusion

When developing applications that interact with REST APIs using Android's Volley library, it is crucial to correctly handle HTTP headers to prevent errors such as 406 Not Acceptable. By overriding the getHeaders() method in your request object, you ensure all necessary headers, such as Content-Type and Auth-Token, are sent along with the request. By following these steps, you should be able to successfully execute GET requests without encountering the 406 error again.

Implementing the changes outlined above will not only resolve your current issue but also provide a better understanding of how to manipulate requests in Volley toolkits. Happy coding!