Modify Header Rule - Requestly

Published: 24 July 2025
on channel: Requestly
883
6

Learn how to intercept and modify request or response headers using Requestly’s Modify Header Rule — perfect for testing, debugging, and simulating different environments.

👉 Download Requestly: https://requestly.io/downloads

Requestly is a powerful HTTP Interception and Mocking Tool. At Requestly,
we aim to provide cohesive shift-left developer experience for intercepting,
debugging, mocking, developing, and testing APIs.

What’s Covered in This Video:

→ What is Requestly and why header modification is useful
→ Installing the Requestly Chrome Extension or Desktop App
→ Overview of the Modify Header Rule
→ How to add custom headers to a request
→ How to modify existing request/response headers
→ Real-world demo on httpbin.org
→ How to target specific URLs using matching rules

Timestamps -
00:00 - Intro: Why HTTP headers matter
00:10 - Common headers that affect frontend projects
00:25 - Installing Requestly Chrome extension
00:45 - Creating a Modify Header Rule
01:00 - Testing your custom header on httpbin.org

Follow Us
→ Twitter: https://x.com/requestlyio
→ Reddit:   / requestly  
→ LinkedIn:   / requestly  

#Requestly #MockAPI #FrontendTesting #APIIntercept #WebDevTools #ModifyAPIResponse #ChromeExtension #JavaScriptTesting


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