I want to allow a web server to handle an HTML import with a redirect and
am running into an issue in the polyfill.
Support a page wants to include a component at /old/stuff/test-element.html:
<link rel="import" href="/old/stuff/test-element.html">
The server wants to fulfill this request with a redirect that points to
/new/test-element.html. The latter file contains the desired element
definition. When the above import is requested, the browser silently gets
the 301/302 redirect to /new/test-element.html, retrieves that file, and
goes about its business.
This mostly works, but I've hit a snag when the referenced
test-element.html file includes a relative path. Suppose the element itself
wants to load a script at "../script.js". Under native HTML imports, this
relative path is applied to the redirected location,
/new/test-element.html, resulting in the final path of /script.js. For my
purposes, that's exactly what is expected and desired.
Under the polyfill, however, the JavaScript layer doesn't know about the
redirect, so it tries to apply the relative path to the original location.
This produces the final path of "/old/stuff/script.js". In my particular
redirect use case, this causes things to break. The same thing goes for any
call within the component to this.resolvePath(). It's my understanding
there's no way at the XMLHttpRequest level for the polyfill to know about
the redirect, so there's no way for it to handle paths relative to the new
(redirected) location.
If there's no existing way to finesse the problem, I was wondering if the
HTML Imports polyfill could define some convention for handling this.
Suppose the server included in the response for the redirected file an
additional header field ("Polyfill-Import-Location:
/new/test-element.html") indicating the location that should be used for
polyfilling access to relative paths found in that file. This would be a
hint for the HTML Imports polyfill, in much the same way that
polyfill-next-selector, etc., are hints to the Shadow DOM polyfill.
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