[Solved] What is wrong with this code snippet for adding a custom header?HttpHeaders headers = new HttpHeaders(); headers.set("X-User", null); return ResponseEntity.ok().headers(headers).body("User info"); | Spring Boot

Spring Boot - Request and Response Handling

What is wrong with this code snippet for adding a custom header?

HttpHeaders headers = new HttpHeaders();
headers.set("X-User", null);
return ResponseEntity.ok().headers(headers).body("User info");

AResponseEntity.ok() cannot accept headers

BSetting header value to null causes the header to be omitted

CHttpHeaders does not have set() method

DHeader names cannot contain dashes

Step-by-Step Solution

Solution:

Step 1: Check HttpHeaders set() method behavior
Setting a header value to null removes or omits that header from the response.
Step 2: Confirm effect on response
The header "X-User" will not appear in the HTTP response because its value is null.
Final Answer:
Setting header value to null causes the header to be omitted -> Option B
Quick Check:
Null header values omit headers [OK]

Quick Trick: Null header values remove headers from response [OK]

Common Mistakes:

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What is wrong with this code snippet for adding a custom header?