[Webkit-unassigned] [Bug 211593] New: Web Inspector: Uncaught Exception: TypeError: null is not an object (evaluating 'mimeType.endsWith')

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=211593

            Bug ID: 211593
           Summary: Web Inspector: Uncaught Exception: TypeError: null is
                    not an object (evaluating 'mimeType.endsWith')
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
               URL: http://localhost/webinspector.apple.com/SpotlightOn/re
                    sponse-cookie/
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: drousso at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

Uncaught Exception in Web Inspector.

# STEPS TO REPRODUCE:
1. inspect a page with a `<form method="post">`
2. attempt to view the resource after submitting

Uncaught Exceptions:
-----------------------
 - TypeError: null is not an object (evaluating 'mimeType.endsWith') (at ResourceClusterContentView.js:441:21)
    _normalizeMIMETypeForDOM @ ResourceClusterContentView.js:441:21
    _tryEnableCustomRequestContentViews @ ResourceClusterContentView.js:477:53
    ResourceClusterContentView @ ResourceClusterContentView.js:50:53
    createFromRepresentedObject @ ContentView.js:49:53
    contentViewForRepresentedObject @ ContentView.js:214:72
    showContentViewForRepresentedObject @ ContentBrowser.js:151:63
    showDefaultContentViewForTreeElement @ NavigationSidebarPanel.js:203:82
    _checkElementsForPendingViewStateCookie @ NavigationSidebarPanel.js:723:79
    _checkOutlinesForPendingViewStateCookie @ NavigationSidebarPanel.js:679:53
    restoreStateFromCookie @ NavigationSidebarPanel.js:246:53
    restoreStateFromCookie @ TabContentView.js:150:63
    ? @ Main.js:1761:46
    ? @ Main.js:1737:37
-----------------------

Notes:
Inspected URL:        http://localhost/webinspector.apple.com/SpotlightOn/response-cookie/
Loading completed:    true
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/605.1.15 (KHTML, like Gecko)

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