There's no generic way to do this, as it would leak information. I don't think this route is worth exploring.
On Wed, Nov 17, 2021, 11:44 AM Tibor Goldschwendt <tib...@chromium.org> wrote: > We explored postMessages for a bit, too. IIUC, this would only solve the > success case properly though. But how do we know the iframe is broken? Not > receiving the postMessage could also mean the iframe hasn't completed > loading yet. > > On Wed, Nov 17, 2021 at 11:34 AM Domenic Denicola <dome...@chromium.org> > wrote: > >> The "error" event does not fire on iframes though, precisely because we >> don't want to leak information cross-origin. >> >> Pages generally deal with broken iframes, in cases where they need to, by >> noticing that the iframe has not sent them the message they expect. (Via >> parent.postMessage() from inside the iframe.) That is, they use an opt-in >> protocol where the iframed page must affirmatively decide what information >> to send cross-origin. >> >> On Wed, Nov 17, 2021 at 2:24 PM Daniel Cheng <dch...@chromium.org> wrote: >> >>> The iframe element supports "load" and "error event listeners. Is the >>> exact HTTP error needed? Or does the feature just need to know if it >>> succeed or not? >>> >>> Daniel >>> >>> On Wed, 17 Nov 2021 at 11:19, Tibor Goldschwendt <tib...@chromium.org> >>> wrote: >>> >>>> +Nasko Oskov <na...@chromium.org> >>>> >>>> Thanks, Kahmy. Adding custom code in the browser process is another >>>> avenue I'm exploring. Generally though, how do pages deal with broken >>>> iframes? >>>> >>>> On Wed, Nov 17, 2021 at 6:39 AM K. Moon <km...@chromium.org> wrote: >>>> >>>>> This would violate the same-origin policy, so I don't think you can do >>>>> this within Blink, but given this is a chrome: page, maybe you could add >>>>> some code in the browser to give this information to you. >>>>> >>>>> On Tue, Nov 16, 2021, 4:40 PM Tibor Goldschwendt <tib...@chromium.org> >>>>> wrote: >>>>> >>>>>> Hi Blink Dev! >>>>>> >>>>>> Is there any way to get the HTTP return code of a cross-domain >>>>>> iframe? FWIW, the hosting page has the chrome:// scheme while the iframe >>>>>> has https:// scheme. From my limited testing I receive the load >>>>>> <https://developer.mozilla.org/en-US/docs/Web/API/Window/load_event> >>>>>> event >>>>>> in all scenarios but couldn't find a way to query whether the load >>>>>> succeeded. I also tried window.addEventListener('error', ...) and >>>>>> iframe.addEventListener('error', ...) without any luck. >>>>>> >>>>>> Best regards, >>>>>> Tibor >>>>>> >>>>>> -- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "blink-dev" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to blink-dev+unsubscr...@chromium.org. >>>>>> To view this discussion on the web visit >>>>>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFgr3n%2B8i%2BNQNSJY0DFab9JrXG0QTq3W473t-beRtPYbLn1XjA%40mail.gmail.com >>>>>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFgr3n%2B8i%2BNQNSJY0DFab9JrXG0QTq3W473t-beRtPYbLn1XjA%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>>> . >>>>>> >>>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "blink-dev" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to blink-dev+unsubscr...@chromium.org. >>>> To view this discussion on the web visit >>>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFgr3nL-J4A0bQuXnU1Ns-eUYLNqVV65KZLeY3HuiPuBYQQmiQ%40mail.gmail.com >>>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFgr3nL-J4A0bQuXnU1Ns-eUYLNqVV65KZLeY3HuiPuBYQQmiQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "blink-dev" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to blink-dev+unsubscr...@chromium.org. >>> To view this discussion on the web visit >>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAF3XrKpDqd9ixPDOFiOu7NjMpmMm62nD0JxzBxyHfLmTJhr0PA%40mail.gmail.com >>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAF3XrKpDqd9ixPDOFiOu7NjMpmMm62nD0JxzBxyHfLmTJhr0PA%40mail.gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACwGi-76C_z5MJ%3D9PGMDOLj%2BuE01zni%2BtPY-aHHZmOO0j%2BA%2BGQ%40mail.gmail.com.
