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Relative URLs are resolved with the document's base URL. See
<a class="moz-txt-link-freetext" href="http://trac.webkit.org/browser/trunk/Source/WebCore/dom/Document.cpp#L4196">http://trac.webkit.org/browser/trunk/Source/WebCore/dom/Document.cpp#L4196</a><br>
A document base's URL is generally the document's URL but there are
ways to override it. See
<a class="moz-txt-link-freetext" href="http://trac.webkit.org/browser/trunk/Source/WebCore/dom/Document.cpp#L2659">http://trac.webkit.org/browser/trunk/Source/WebCore/dom/Document.cpp#L2659</a><br>
<br>
Once you have the base, resolving a URL is well defined.<br>
<br>
Benjamin<br>
<br>
<div class="moz-cite-prefix">On 2/15/15 2:44 PM, Lew Hollerbach
wrote:<br>
</div>
<blockquote cite="mid:013801d04970$e41f84a0$ac5e8de0$@com"
type="cite">
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<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">Hello,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">In
the most general terms, my question is around relative
paths in links (e.g.,
<link>, <<span class="SpellE">img</span>>,
<script>) and the
related HTTP GET request, and the corresponding
Request/Response headers: how
WebKit builds the headers, and how WebKit resolves
relative paths.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">What
happens if the URL to a resource is not an absolute URL
but a relative one? My
own testing suggests that the “Host” request-header field
is
what’s used to resolve relative paths. Is that correct?
(If it
isn’t correct, then what is used to resolve relative
URLs?)<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">But,
if it is, then how does the browser/WebKit know what the
value of this field
should be? Often — but certainly not always — the value is
just the
basic domain name, like “www.somesite.com”. But it can
also have
different sub-domains, like “assets.somesite.com”. So what
does the
browser use to determine this “host” value?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">And,
is there anything in a response-header — from the original
request
— that the browser uses to set this value? So, for a real
example, if you
go to “www.lordandtaylor.com”, when the page is loaded and
parsed,
the very first <script>’s “<span class="SpellE">src</span>”
is <o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">"/<span class="SpellE">wcsstore</span>/<span
class="SpellE">dojoHBC</span>/dojo/dojo.js".
So how does the browser know that the “host” value should
be
“www.lordandtaylor.com” here?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">Then,
a few <script>s later, a request goes to
“<a class="moz-txt-link-freetext" href="http://1.shrd.lordandtaylor.com”">http://1.shrd.lordandtaylor.com”</a> (absolute URL), and the
immediately following request again has a relative path of
“/<span class="SpellE">wcsstore</span>/<span
class="SpellE">HBCStorefrontAssetStore</span>/javascript/<span
class="SpellE">jquery.min.js</span>”; again, how does
the browser know to —
again — use “www.lordandtaylor.com” for the
“host” value for this second request?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">This
area is confusing for me and I don’t have the necessary
knowledge to
understand the inner workings here.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">If
we do end up knowing how this “host” value is arrived at,
how can
we — from within JavaScript — set it so that, as the page
is parsed
and rendered, the rendering engine can know what this
“host” should
be? Is there some global or <span class="SpellE">window.variable</span>,
or other
global setting that can be set via an API from JavaScript?
Obviously the
rendering engine (or some other part of the browser) must
know what it is so
that the Request-header is correctly set when the various
HTTP GET requests
— to fetch images, CSS files, JavaScript files, etc. — are
invoked.
Would you know how we can set this “host” value?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">And,
as I mentioned earlier, if it’s not “host” that determines
how relative paths are resolved, then what is?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">I’m
trying to load a Website through your proxy, to bypass the
same-origin
restrictions, and have it fully rendered inside an
<iframe>. Not for any
nefarious purposes such as <span class="SpellE">clickjacking</span>;
no,
we’re building a consumer-facing app that features a way
to view and
browse any Website from the app, with some other features.
And the app (a
hybrid mobile app) runs inside embedded WebKit.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">I
know this can be done: A few companies have successfully
implemented such a
feature, for use cases such as customer service,
co-browsing, etc. Every
company that I know of who has successfully done this has
been acquired —
presumably exactly for this feature — and so their IP is
clearly a trade
secret and can’t be easily (if at all) gotten at.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">If
what we’re trying to do can’t be done using proxies, is
there
another way that you would work, that would result in the
same ultimate
experience — of being able to load any given Website into
some container
and have it be fully functional, allow all the links to be
traversed and assets
loaded?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">Thanks
for any and all insights, suggestions, and general help!<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span
style="font-size:11.0pt">Lew<o:p></o:p></span></font></p>
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