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How to modify HTTP(s) Request & Response Headers in Chrome, Firefox & Safari using Requestly

Modify HTTP(s) Headers using Requestly

HTTP(s) Headers are key-value pairs that can be used by the client or the server to pass additional information along with an HTTP(s) request or response. An HTTP(s) header consists of its case-insensitive name followed by a colon (:), then by its value.

The ability to modify the headers of traffic that passes through your browser is a great tool to have.

You can delete certain headers to minimize online tracking, remove CSP while testing, test sites in production and so on.

Using Requestly, Headers can be added/modified by a simple series of clicks. All you need is to install Requestly extension in your browser.

Modify Headers could be selected after clicking on New Rule button.

Screenshot — New Rule Selection

Select if you want to modify request header or response header and give a suitable name and description to the rule.

Remove Content-Security-Policy Response Header (Example)

Step 1. Select Header Type —  Request Headers or Response Headers

Removing Content Security Policy header on

Step 2. Select Operation — Add/Remove/Modify

You can add a new header or remove, modify an existing request/response header. For this example, we will select Remove.

Removing Content Security Policy header on

Difference between Add and Modify option

Add operation works when a new header is to be added to the request/response whereas modify option modifies an already existing header.

Step 3. URL Targeting — Specify when Modify Headers rule should apply

You can apply the rules based on URL, hostname or path. You can also use regex to match it.

URL Targeting — Apply the Rule when URL Contains

More Examples

If you haven’t installed Requestly yet, please install it to modify request and response headers. Reach out to for any questions.

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