How to Set the Host Header in Fetch (JavaScript)

📰 Dev.to · reynaldi

Learn how to set the Host header in Fetch using JavaScript for cross-origin requests

intermediate Published 27 Feb 2026

Action Steps

Understand the concept of forbidden header names in browsers
Use the mode: 'cors' option in Fetch to enable cross-origin resource sharing
Configure a proxy server to set the Host header on behalf of the client
Apply the 'fetch' function with the appropriate options to send a request with the Host header
Test the request using tools like Chrome DevTools or Fetch API debugging libraries

Who Needs to Know This

Frontend developers and engineers working with JavaScript and Fetch API can benefit from this knowledge to handle cross-origin requests

Key Insight

💡 The Host header is a forbidden header name in browsers, but can be set using a proxy server or other workarounds