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    Suggestion 
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    Resolution: Duplicate
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    P2: Important 
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    None
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    None
It is not possible to make a cross origin request through custom url schemes. WebEngine throws this warning when attempting to do so:
* XMLHttpRequest cannot load xxx://localhost/something. Cross origin requests are only supported for protocol schemes: http, data, chrome, https.
There does not seem to be any way to enable CORS for custom schemes through Qt APIs, but blink does have an API for it (WebSecurityPolicy::registerURLSchemeAsCORSEnabled). Perhaps this could be exposed.
- relates to
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                    QTBUG-65751 QtWebEngine: Custom url schemes cannot access file urls -         
- Closed
 
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                    QTBUG-62536 WebSockets not supported when loaded from non-default scheme -         
- Closed
 
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