Is it Possible to Use Header() for Redirection with Custom Headers?

Presumptive Technique for Redirect with Custom Headers

Originally, the intention was to leverage PHP's header() function to redirect to a specific page while simultaneously transmitting custom HTTP headers. However, this approach is not feasible.

Unveiling the Impossibility

Contrary to common belief, it is impossible to employ header() multiple times to accomplish the desired result. The reason for this limitation lies in the fact that these headers are associated with the redirect response, not the redirect itself. Thus, any attempt to set custom headers using this method will be futile.

An Alternative Path: Exploiting XMLHttpRequest and CORS

The solitary solution for directing a browser to issue an HTTP request with a custom header resides in utilizing Javascript's XMLHttpRequest object and implementing CORS on the destination server. XMLHttpRequest possesses the capability to initiate asynchronous requests with customized headers. However, it is imperative to note that this method is only viable if the target server allows for such ajax requests through CORS implementation.

Exclusion of Client-Side Redirection

It is important to emphasize that a web page cannot set HTTP request headers unless it initiates an asynchronous request via XMLHttpRequest. Consequently, implementing the aforementioned redirection with custom headers on the client-side is also an unattainable goal.

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