Which of the following is the correct way to create HttpHeaders with a 'Content-Type' of 'application/json'?

easy📝 Syntax Q3 of 15

Angular - HTTP Client

Anew HttpHeaders.set('Content-Type', 'application/json')

Bnew HttpHeaders({'Content-Type': 'application/json'})

Cnew HttpHeaders.append('Content-Type', 'application/json')

Dnew HttpHeaders().add('Content-Type', 'application/json')

Step-by-Step Solution

Solution:

Step 1: Check HttpHeaders constructor usage
The constructor accepts an object with header keys and values, so new HttpHeaders({'Content-Type': 'application/json'}) is valid.
Step 2: Understand method chaining
set() returns a new instance, so chaining without assignment won't work. append() exists but is used differently. add() is invalid.
Final Answer:
new HttpHeaders({'Content-Type': 'application/json'}) -> Option B
Quick Check:
Headers creation = constructor object [OK]

Quick Trick: Use constructor object to set headers initially [OK]

Common Mistakes:

MISTAKES

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