[Webkit-unassigned] [Bug 206064] New: EventSource Http Status: 200 but Showing Error

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206064

            Bug ID: 206064
           Summary: EventSource Http Status: 200 but Showing Error
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: parikhdhruvesh1 at gmail.com
                CC: inspector-bugzilla-changes at group.apple.com

Created attachment 387331

  --> https://bugs.webkit.org/attachment.cgi?id=387331&action=review

safari eventsource with close

When using EventSource (https://developer.mozilla.org/en-US/docs/Web/API/EventSource) library in Safari 13, with closing the connection when done,
Ex: 
var source = new window.EventSource("someurl");
source.onmessage = function(event) {
    source.close();
};


I am getting error in WebInspector inspite the status code is 200. Means behaviour is as intended, only showing error in WebInspector UI.
I have explained in image the same.

Image: bug-safari-eventsource-close.jpeg

When we are not closing the EventSource object it works fine
#source.close() 

Can we solve this ?

Link: https://jsfiddle.net/parikhdhruvesh1/kxos7yjz/24/

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