GefRequestHandler.GetAuthCredentials not called for images
Posted: Mon Oct 05, 2020 11:02 amI am having a problem with proxy authentication and images. It seems the GefRequestHandler.GetAuthCredentials never gets called when loading images via an img tag. I know this worked in older versions (v62 at least).
I have boiled it down to the simplest case I could think of, just having a local html file on disk, referencing an image on the web, and running Fiddler as a proxy requiring authentication. In real life things are a lot more complicated, but we seem to get the same behavior. If I reference the same url as src on an iframe, prompting for credentials works as expected.
I see that there have been changes to the CefRequestHander and that you now can override CefRequestHandler.GetResourceRequestHandler to provide a CefResourceRequestHandler to control resource loading. If I do that I can see that loading the image fails with status 407. Proxy Authentication Required.
Is this behavior as expected? If so, is there a way to get GefRequestHandler.GetAuthCredentials to be called in this case as well, or any other way to solve the problem?
I have boiled it down to the simplest case I could think of, just having a local html file on disk, referencing an image on the web, and running Fiddler as a proxy requiring authentication. In real life things are a lot more complicated, but we seem to get the same behavior. If I reference the same url as src on an iframe, prompting for credentials works as expected.
I see that there have been changes to the CefRequestHander and that you now can override CefRequestHandler.GetResourceRequestHandler to provide a CefResourceRequestHandler to control resource loading. If I do that I can see that loading the image fails with status 407. Proxy Authentication Required.
Is this behavior as expected? If so, is there a way to get GefRequestHandler.GetAuthCredentials to be called in this case as well, or any other way to solve the problem?