When debugging a Spring RestTemplate, inspecting the requests and responses can provide invaluable insights. To replicate the verbose output of the curl command with the "-v" option, we need to enable detailed logging or debugging for the RestTemplate.
One approach involves modifying the RestTemplate's source code to include additional logging statements, but this is not recommended as a primary solution. Instead, we can leverage the power of ClientHttpRequestInterceptor.
Custom ClientHttpRequestInterceptor for Request/Response Logging
To log both request and response details, we can implement a custom ClientHttpRequestInterceptor:
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RestTemplate Configuration with Buffering and Interceptor
To use our custom interceptor, configure the RestTemplate as follows:
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Note that the BufferingClientHttpRequestFactory is necessary to allow the interceptor to access the response body multiple times.
Usage and Expected Output
With this configuration in place, calling restTemplate.execute() will log the request and response details in the desired format:
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And you will see the following in the log:
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This detailed logging provides a comprehensive view of the RestTemplate's interactions, making debugging significantly more efficient and convenient. By avoiding code modifications and leveraging the provided extensibility mechanisms, this approach offers a clean and flexible solution to this common debugging challenge.
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