Скачать или смотреть Understanding the MissingRequestHeaderException in Spring Boot

Discover the solution to handle `MissingRequestHeaderException` in Spring Boot applications using a custom exception handler to ensure request header validation.
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This video is based on the question https://stackoverflow.com/q/62260557/ asked by the user 'ng.newbie' ( https://stackoverflow.com/u/7134737/ ) and on the answer https://stackoverflow.com/a/62261155/ provided by the user 'Boris Chistov' ( https://stackoverflow.com/u/1328828/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Handling MissingRequestHeaderException in Spring Boot

When developing applications using Spring Boot, managing request headers properly is paramount for ensuring the integrity and expected behavior of your APIs. However, a common issue developers face is understanding how exceptions related to missing headers are handled. This guide walks you through handling the MissingRequestHeaderException specifically, highlighting how to create a proper exception handler in your Spring Boot application.

The Problem

In a large codebase, you may want to introduce request header validation to ensure clients are sending the necessary data. Once you've implemented this, you might expect a ConstraintViolationException to be thrown when headers are missing or invalid. However, you may encounter a MissingRequestHeaderException that seems to bypass your custom exception handling.

Example Scenario:

Consider the following controller that validates a request header:

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If a client calls testMethod without the required header, Spring Boot throws a MissingRequestHeaderException instead of the expected ConstraintViolationException.

Issue Encountered:

You notice in your logs:

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This indicates that the missing header exception is being handled by some unseen exception handler, leaving your custom handler uninvoked.

The Solution

To effectively handle the MissingRequestHeaderException, we need to follow these steps:

Step 1: Define the Order of Your Exception Handler

Use the @ Order annotation to set the order of your ValidationExceptionHandler class. By default, all exception handlers have the same order. Setting your handler to a higher precedence ensures it gets invoked before the default handlers.

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Step 2: Override the Appropriate Exception Handling Method

MissingRequestHeaderException is a subclass of ServletRequestBindingException. To handle it correctly, you need to override the handleServletRequestBindingException method in your exception handler.

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Summary of Steps

Define the order of your exception handler by using @ Order(Ordered.HIGHEST_PRECEDENCE).

Override the handleServletRequestBindingException method to provide a custom response for handling MissingRequestHeaderException.

Conclusion

By following the outlined steps, you can ensure that the MissingRequestHeaderException is handled properly in your Spring Boot application. This will allow for a more seamless experience when validating request headers, ensuring that clients receive meaningful error messages when they fail to provide necessary information.

With the proper setup, you take control over how exceptions are managed and can provide better feedback to your API users.

For further reading, you might want to explore more on exception handling in Spring Boot and the nuances of @ ControllerAdvice to better equip your applications.