[Solved] What will be the output headers if the following code runs in a Node.js HTTP server?res.setHeader('X-Custom', '123'); res.setHeader('Content-Type', 'text/plain'); res.end('Hello'); | Node.js

Node.js - HTTP Module

What will be the output headers if the following code runs in a Node.js HTTP server?

res.setHeader('X-Custom', '123');
res.setHeader('Content-Type', 'text/plain');
res.end('Hello');

A{ 'Content-Type': 'text/plain' }

B{ 'X-Custom': '123', 'Content-Type': 'text/plain' }

C{ 'X-Custom': '123' }

D{}

Step-by-Step Solution

Solution:

Step 1: Identify headers set before response ends
The code sets two headers: 'X-Custom' with '123' and 'Content-Type' with 'text/plain'.
Step 2: Confirm headers sent with response
Both headers remain set when res.end() is called, so both are sent to the client.
Final Answer:
{ 'X-Custom': '123', 'Content-Type': 'text/plain' } -> Option B
Quick Check:
Headers set before end = A [OK]

Quick Trick: All set headers before res.end() are sent [OK]

Common Mistakes:

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What will be the output headers if the following code runs in a Node.js HTTP server?