You want to set multiple headers at once in a Node.js HTTP response. Which approach correctly sets Content-Type to application/json and Cache-Control to no-store?
hard📝 Application Q8 of 15
Node.js - HTTP Module
You want to set multiple headers at once in a Node.js HTTP response. Which approach correctly sets Content-Type to application/json and Cache-Control to no-store?
res.setHeader() sets one header at a time; it does not accept an object.
Step 2: Identify correct multiple header setting
Calling setHeader twice sets both headers correctly. res.writeHead({ 'Content-Type': 'application/json', 'Cache-Control': 'no-store' }); uses writeHead without a status code, which causes an error since status code is required.
Final Answer:
res.setHeader('Content-Type', 'application/json'); res.setHeader('Cache-Control', 'no-store'); -> Option B
Quick Check:
Set headers one by one with setHeader() = C [OK]
Quick Trick:Call setHeader separately for each header [OK]
Common Mistakes:
Passing object to setHeader()
Assigning headers directly to res.headers
Confusing writeHead() with setHeader()
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