Origin Header

Table of Content

The Origin header is an HTTP header used in web communication. The purpose of the Origin header is to indicate the origin of the request during cross-origin requests. It is a critical part of web security mechanisms like CORS (Cross-Origin Resource Sharing), which helps protect sites from attacks.


The syntax of the Origin header is quite straightforward. It includes the scheme (http or https), the host (domain), and optionally the port.

Origin: scheme://host[:port]


Unlike many other HTTP headers, the Origin header does not have any directives. It is simply composed of the aforementioned parts in the syntax.


Here is an example of an Origin header:

Origin: https://example.com:443

In this example, the scheme is "https", the host is "example.com", and the port is 443, which is the default port for secure HTTP connections.

Browser Compatibility

Browser Compatibility
Chrome Supported
Firefox Supported
Safari Supported
Opera Supported
Edge Supported

How to modify Origin header

ModHeader is an extension for Google Chrome that allows you to modify request and response headers. You can use it to add, modify, or remove HTTP request headers.

To modify the Origin header using ModHeader, follow these steps:

  1. Install the ModHeader extension from the Chrome Web Store.
  2. Click the ModHeader icon in the toolbar to open the extension.
  3. In the 'Request Headers' section, click 'Add' to create a new header.
  4. In the 'Name' column, enter 'Origin'.
  5. In the 'Value' column, enter the origin you want to use, e.g. 'https://example.com'.

Modifying the Origin header can be useful for testing or development purposes. However, changing the Origination Header should be done with caution, as it can potentially break site functionality or violate security practices.