Retry a download will request image URL again and cost more image limits on Tampermonkey

[ccloli]

Since the image limit only cost when requesting image URL (see wiki), the script will use finalUrl field to get the real image URL which is provided by GM_xmlHttpRequest, this should save your image limits when re-downloading.

However, in latest Tampermonkey, it only assigns finalUrl when the request is loaded, and before that the finalUrl is the request URL. That means when re-downloading, the script will request image URL again, and cost your image limits again.

The finalUrl is the requesting image URL when the file is not fully downloaded

The finalUrl only updates when the file is fully downloaded

It works fine on GreaseMonkey, once GreaseMonkey get the headers of request, it updates finalUrl.

Before Tampermonkey fix the bug, maybe we can extract the final URL from tm-finalurlgcal header.

For the script user, if you usually needs to restart a download (often request fails or needs to abort if speed is too low), it's better to use GreaseMonkey for now.

[derjanb]

The finalUrl only updates when the file is fully downloaded

Will be fixed at the next BETA release. :)