chromium - send custom header info on initial page load c#

Question

Or How to inject a custom header into the initial request to a site when new-ing up an instance of the ChromiumWebBrowser.

I\'m a noob with Chromium

Answer 1

Updated to reflect major Chromium changes

Updated to reflect changes made in version 75 (should work in 75 and newer)

The method you're after should be OnBeforeResourceLoad, a basic example should look like:

public class CustomResourceRequestHandler : ResourceRequestHandler
{
    protected override CefReturnValue OnBeforeResourceLoad(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IRequestCallback callback)
    {
        var headers = request.Headers;
        headers["User-Agent"] = "My User Agent";
        request.Headers = headers;

        return CefReturnValue.Continue;
    }
}

public class CustomRequestHandler : RequestHandler
{
    protected override IResourceRequestHandler GetResourceRequestHandler(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool isNavigation, bool isDownload, string requestInitiator, ref bool disableDefaultHandling)
    {
        return new CustomResourceRequestHandler();
    }
}

browser.RequestHandler = new CustomRequestHandler();

Using the IRequest.Headers property you must read the headers property, make changes then reassign it. It's now possible to use the SetHeaderByName/GetHeaderByName functions to get/set a single header.

• RequestHandler API Doc
• ResourceRequestHandler API Doc
• IRequest.GetHeaderByName API Doc
• IRequest.SetHeaderByName API Doc