[Webkit-unassigned] [Bug 170849] New: A blob created from a fetch response does not correctly get type set

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Apr 14 09:22:01 PDT 2017


https://bugs.webkit.org/show_bug.cgi?id=170849

            Bug ID: 170849
           Summary: A blob created from a fetch response does not
                    correctly get type set
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dahjelle.webkit.org at thehjellejar.com

In Safari 10.1 on macOS 10.12.4 (and I believe on iOS as well), the following code shows an empty content-type, rather than 'text/html' as I would expect and as Chrome/Firefox do.

```
var output = document.querySelector('span');
fetch('https://enable-cors.org/').then(function(response) {
  return response.blob();
}).then(function(blob) {
  output.innerText = "'" + blob.type + "'";
}).catch(function(error) {
  output.innerText = 'Error: ' + error.message;
  console.log(error);
});
```

See a runnable version at https://jsbin.com/hubope/edit?js,output.

While this sounds like 161228, which is marked as fixed last year, it's a problem in the most recent version of Safari. 137647 sounds similar, too, but was about XHR and not the Fetch API.

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