[Interest] QWebEngine, custom URL schemes and content-types

Andy asmaloney at gmail.com
Mon Apr 8 13:46:15 CEST 2019

Not sure if it's the same situation, but I just had a similar problem -
SVGs weren't showing up properly because I had the wrong MIME type.

I fixed it by using the QMimeDatabase like this:

      const auto  cMIMEType = QMimeDatabase().mimeTypeForData( data );

      inRequest->reply( cMIMEType.name().toLatin1(), buffer );

(where "data" is the contents of a file)

Andy Maloney  //  https://asmaloney.com
twitter ~ @asmaloney <https://twitter.com/asmaloney>

On Mon, Apr 8, 2019 at 7:40 AM Steve Atkins <steve at blighty.com> wrote:

> I'm using a custom URL scheme by registering the scheme with
> QEbEngineUrlScheme::registerScheme() at app startup, creating a handler
> ("Assets")  that inherits from QWebEngineUrlSchemeHandler, installing that
> scheme handler in the QWebEngineProfile passed to the QWebPage.
> Assets::requestStarted(QWebEngineUrlRequestJob *job) handles the request
> and finishes by doing job->reply() with a content type of
> application/javascript and an open QFile.
> Everything works fine. The page loads, it loads scripts from the header
> from URLs asset:whatever.js, the content is correct and the js runs fine.
> Until I try and load the asset: scripts as ES6 modules. Then I get "Error:
> Failed to load module script: The server responded with a non-JavaScript
> MIME type of \"\". Strict MIME type checking is enforced for module scripts
> per HTML spec. (asset:/ticket.js:0)".
> It seems from that that job->reply() is not setting the content-type of
> the response successfully. I've tried to confirm that, but the chrome
> inspector shows no response headers, and fetch() errors out because the
> custom URL scheme isn't supported.
> Does this look familiar to anyone? And has anyone used custom schemes with
> content-types successfully?
> Cheers,
>  Steve
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