[Webkit-unassigned] [Bug 205686] New: EventSource Status 200 but showing error

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205686

            Bug ID: 205686
           Summary: EventSource Status 200 but showing error
           Product: WebKit
           Version: Safari 13
          Hardware: All
                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 386606

  --> https://bugs.webkit.org/attachment.cgi?id=386606&action=review

status 200 but showing error

When using eventsource https://developer.mozilla.org/en-US/docs/Web/API/EventSource api in Safari, 
we are getting Response as Status: 200 OK but in Safari Inspector getting Response as Red. (Please check 200_OK_Response.png)

To replicate it create this page with the script as

<script>
    var source = new window.EventSource(
        "https://cdneast2-xch.media.net/AdExchange/rtbsspub?&gdpr=0&gdprconsent=1&cid=8CU6Q6626&region=nv&ptrid=8PRL4E7N3&requestString=881672292*84%7C1x1_TNG7O25_1%7C8CU6Q6626%7C881672292&crid=881672292&sd=3&requrl=http%3A%2F%2Fhblocal.media.net%2Ftest%2Fscroll-page-test.php&bl=1&rt=5&dn=http://hblocal.media.net&https=0&act=cache&prvReqId=373632267375476031576859414904&erTr=0&hlt=1&ugd=4&adt=desktop&kwrf=http%3A%2F%2Fhblocal.media.net&tr=0.15479458203630414&ndec=1&scrsize=1920x1080&taginfo=%7B%7D&pageinfo=%7B%22vw%22%3A1852%2C%22vh%22%3A468%2C%22ph%22%3A468%7D&itype=HB&sid=7305&tmt=300&at=3&prid=8PRVCXX19&dma=635&cc=US&rc=TX&ct=SANMARCOS",
        {withCredentials:true}
    );
    source.addEventListener("close", function (event) {
        if (!event) {
            return;
        }
        if (event.data === "CLOSE") {
            source.close();
            window.console.log("it is closed");
        }
    }, false);
</script>

and check in Safari Inspector

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