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[Bug 12217] New: Suggestion: Allow other 'Content-Type's to result from javascript: scheme URI dereferencing

From: <bugzilla@jessica.w3.org>
Date: Wed, 02 Mar 2011 04:56:59 +0000
To: public-html-bugzilla@w3.org
Message-ID: <bug-12217-2486@http.www.w3.org/Bugs/Public/>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=12217

           Summary: Suggestion: Allow other 'Content-Type's to result from
                    javascript: scheme URI dereferencing
           Product: HTML WG
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: HTML5 spec (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: l0mars01@yahoo.com
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,
                    public-html@w3.org


http://www.w3.org/TR/html5/webappapis.html#javascript-protocol
Currently, dereferencing a javascript: scheme URI treats its script evaluation
result as the body of an HTTP response with Content-Type 'text/html'.
Navigation then uses Media Type Sniffing to adjust this Content-Type and
dispatch corresponding processing.
http://www.w3.org/TR/html5/fetching-resources.html#content-type-sniffing-0
According to 'Media Type Sniffing', the sniffed content type is either
'text/html', 'application/rss+xml', or 'application/atom+xml'. This precludes
processing for other media types (eg, other XML media types like
'application/xhtml+xml' or 'image/svg+xml') a javascript: URI could generate.

I propose allowing the script result to explicitly specify the HTTP
'Content-Type' entity header as if it were a partial HTTP response lacking a
start-line. Eg, evaluating the script could result in a string like this:
Content-Type: <media-type>

<message-body>
The user-agent could supply a function to facilitate writing these correctly
(inserting field-names, colons, and carriage return linefeed sequences;
cleaning the content; etc). I invite the reader to consider other options if
this one is unsatisfactory.

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Received on Wednesday, 2 March 2011 04:57:01 GMT

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