[Solved] Consider this code snippet in a microservice forwarding a JWT token: fetch('http://serviceB/api', { headers: { 'Authorization': req.... | Microservices

Microservices - Authentication and Authorization

Consider this code snippet in a microservice forwarding a JWT token:

fetch('http://serviceB/api', {
  headers: { 'Authorization': req.headers['authorization'] }
})

What will happen if the original request has no Authorization header?

AThe Authorization header is set to an empty string

BService B receives an Authorization header with value 'undefined'

CThe fetch call throws an error and fails

DService B receives the request without any Authorization header

Step-by-Step Solution

Solution:

Step 1: Check header forwarding code
The code forwards req.headers['authorization'] directly as the Authorization header value.
Step 2: Understand missing header behavior
If req.headers['authorization'] is undefined, the header is omitted in fetch, so Service B gets no Authorization header.
Final Answer:
Service B receives the request without any Authorization header -> Option D
Quick Check:
Missing header means no Authorization sent [OK]

Quick Trick: Undefined header means no header sent, not 'undefined' string [OK]

Common Mistakes:

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