I am not aware of any override on WKWebView that permits file:// access. I’m the second person to have posted this as a bug on the Apache Cordova bug tracker. It is not hard to file other reports of people stumbling over the lack of file:// support in WkWebView. The embedded web server approach seems to be the usual solution. But that doesn’t capture the file:// XHR requests.
… so… hmm…. head scratch… seems to be a blocker at the moment. On Mon, May 2, 2016 at 3:22 PM, Eric Bidelman <[email protected]> wrote: > On IOS (a polyfilled browser), the web components polyfill loads html > imports using XHR. This means that from a webview, they're loaded from > file:///, which is typically blocked by browsers/environments for security > reasons. > > Unsure if there's an equivalent in ios, but in android webview, you can > override this setting: > > https://www.polymer-project.org/0.5/articles/webview.html#tweaking-the-webview-settings > > The other option is to vulcanize your entire app (vulcanize index.html -o > index.v.html) which removes all import requests. > > On Mon, May 2, 2016 at 12:10 PM Jim Trainor <[email protected]> > wrote: > >> am about to revisit this in depth… but… the last time I dug in there was >> definitely an XHR load of an html file originating from polymer (from the >> web component.min.js, actually, as I recall, which I am classifying >> generically as “polymer”). >> >> As I recall the XHR request was loading html web components from its host >> (I think it was loading the entire vulcanized html file). If that host url >> happens to be file:// then that is what it used for the XHR request. The >> problem is… WKWebView rejects that access… so no-go for the Polymer app. >> >> If the page is loaded via an ordinary http request then all is well. The >> exact same code loading via an Android WebView is fine also. The problem >> is limited to security restrictions in WKWebView. See the bug link that I >> posted for more info. >> >> On Mon, May 2, 2016 at 12:34 PM, Karl Tiedt <[email protected]> wrote: >> >>> Nothing in polymer appears to reference file:// anything... this sounds >>> like it may be a Cordova issue? >>> >>> -Karl Tiedt >>> >>> On Mon, May 2, 2016 at 9:17 AM, Jim Trainor < >>> [email protected]> wrote: >>> >>>> Polymer applications fail to load in an iOS WKWebView, as supported by >>>> Cordova. The root cause of the problem is that WKWebView does not permit >>>> loading of content via file:. Cordova's support for WKWebView bypasses >>>> this restriction by implementing a in-app web server to host the static >>>> content. Polymer fails because the polymer code tries to load a local, >>>> static, html file, using a file:// url via an XHR request. The file:// XHR >>>> request is rejected by WKWebView. >>>> >>>> This has turned into a blocking issue for publishing Polymer >>>> applications, using Cordova, on iOS. >>>> >>>> Does this sound familiar to anybody? >>>> >>>> Is there anyway to cleanly define the URL where Polymer loads elements >>>> (or whatever is loaded via the file:// XHR)? >>>> >>>> Here is the Apache bug: Allow WKWebView to proxy file:// url loading >>>> in XmlHttpRequest.open >>>> <https://issues.apache.org/jira/browse/CB-10109?jql=project%20%3D%20CB%20AND%20labels%20%3D%20wkwebview-known-issues> >>>> >>>> >>>> >>>> >>>> Follow Polymer on Google+: plus.google.com/107187849809354688692 >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "Polymer" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/polymer-dev/72dda4a2-5447-4dec-a4e7-b075a02927ad%40googlegroups.com >>>> <https://groups.google.com/d/msgid/polymer-dev/72dda4a2-5447-4dec-a4e7-b075a02927ad%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> >> Follow Polymer on Google+: plus.google.com/107187849809354688692 >> --- >> You received this message because you are subscribed to the Google Groups >> "Polymer" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/polymer-dev/CACDv4tDu6JrtF1TQcv_KtB1V_W%3Dfouhtbrv_AV6SaMGeLMTH9Q%40mail.gmail.com >> <https://groups.google.com/d/msgid/polymer-dev/CACDv4tDu6JrtF1TQcv_KtB1V_W%3Dfouhtbrv_AV6SaMGeLMTH9Q%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > Follow Polymer on Google+: plus.google.com/107187849809354688692 --- You received this message because you are subscribed to the Google Groups "Polymer" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/polymer-dev/CACDv4tDUgatzLXBSXGkjJn7xWomi6%2By-uQCGF0JN1i_mwJ%2B8aQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
