Here are a few title options, varying in style and directness: **Direct & Informative** * **Spring MVC: Why Is My JSON Request Returning a 406 (Not Acceptable) Error?** * **Troubleshooting 406 (

Spring JSON Request Failing with 406 (Not Acceptable)

The issue you're facing with your Spring MVC application where a JSON request is returning a 406 error can be attributed to a discrepancy between the request's Accept header and the return value of your controller method.

The Accept header in your request specifies that the client expects a response with an application/json content type. However, your controller method is not configured to produce a JSON response. The most likely cause of this is that the correct HTTPMessageConverter is not available to handle the conversion between your method's return type (Weather object) and the JSON format.

To resolve this issue, you need to ensure that the required Jackson library is present in your application's classpath. Jackson is a widely used JSON processing library that provides the necessary HTTPMessageConverter for handling JSON conversions in Spring MVC.

Once you have added the correct Jackson library, you can remove the headers="Accept=/" directive from your controller method. This directive tells Spring to accept any Accept header, which can lead to unexpected behavior. Instead, you should rely on the default settings, which will automatically negotiate the response format based on the client's Accept header.

By following these steps, you can configure your Spring MVC application to correctly handle JSON requests and return the expected response format.

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