How Can I Specify the HTTP Request Origin Address Using Go's Dialer?

Leveraging Dialer to Specify HTTP Request Origin Address

In certain scenarios, it becomes necessary to override the default origin IP address used for HTTP requests. The Go standard library lacks explicit documentation for addressing this use case. However, by leveraging the Dialer type, one can customize which IP address to utilize for an HTTP request.

To achieve this, a custom Dialer must be created and assigned to the Client's Transport. The DialContext method of the Dialer allows for specifying a LocalAddr field, which designates the desired origin address. Here's an example code snippet demonstrating its implementation:

By using this technique, developers can control the origin IP address used for HTTP requests, enabling scenarios where a specific IP address is required for a particular request.

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