How Can I Capture and Examine HTTP Response Headers with a Chrome Extension?

Extension to Examine HTTP Response Headers

Modifying HTTP request headers using Chrome extensions can be straightforward, but capturing response headers can seem elusive. However, a few clever techniques can help you navigate this challenge.

One approach is to inject a custom script, injected.js, into the website using the ManifestV2 or V3 method. This script captures AJAX requests and responses through XMLHttpRequest events.

injected.js incorporates code from the resource: "How we captured AJAX requests from a website tab with a Chrome Extension." It allows you to access both request and response headers in a convenient JSON format, giving you deep insights into the communication between the website and remote servers.

This approach involves the following steps:

1. Create an "inject.js" script that injects the "injected.js" into the websites you specify.
2. Develop "injected.js" to capture XMLHttpRequest events.
3. Define website-specific rules in your "manifest.json" file to control when and where the injection occurs.

By following these steps, you can effectively capture and examine HTTP response headers, providing valuable information for debugging, analysis, and more.

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