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Why does this code throw an error?

medium📝 Debug Q7 of 15
Node.js - HTTP Module
Why does this code throw an error?
res.setHeader('Content-Type');
res.end();
AContent-Type header cannot be set manually
Bres.end() must be called before setHeader
CsetHeader requires both name and value arguments
DHeader names must be lowercase
Step-by-Step Solution
Solution:

  1. Step 1: Check method signature

    res.setHeader() requires two arguments: header name and header value.

  2. Step 2: Identify missing argument

    The code only provides the header name, missing the value, causing an error.

  3. Final Answer:

    setHeader requires both name and value arguments -> Option C

  4. Quick Check:

    setHeader needs name and value = B [OK]
Quick Trick: Always provide both name and value to setHeader() [OK]
Common Mistakes:
  • Passing only header name
  • Assuming default header values
  • Thinking header names must be lowercase

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