Why might a Spring Boot controller method with @RequestBody fail to bind JSON when the Content-Type header is missing or incorrect?

hard📝 Conceptual Q10 of 15

Spring Boot - REST Controllers

Why might a Spring Boot controller method with @RequestBody fail to bind JSON when the Content-Type header is missing or incorrect?

AContent-Type header is ignored by Spring

BSpring uses Content-Type to select the correct HttpMessageConverter for JSON

C@RequestBody works without Content-Type header

DMissing Content-Type causes Spring to treat body as form data

Step-by-Step Solution

Solution:

Step 1: Role of Content-Type header
Spring uses Content-Type to know how to convert the request body (e.g., JSON, XML).
Step 2: Effect of missing or wrong Content-Type
If missing or incorrect, Spring cannot find the right converter and fails to bind JSON.
Final Answer:
Spring uses Content-Type to select the correct HttpMessageConverter for JSON -> Option B
Quick Check:
Content-Type guides JSON binding [OK]

Quick Trick: Always set Content-Type: application/json for JSON requests [OK]

Common Mistakes:

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