IE11 blocks POST XHR requests (HTTP/2)

Confirmed Issue #21427946 • Assigned to Payal S.


Renganathan D.
May 1, 2019
This issue is public.
Found in
  • Internet Explorer
Reported by 1 person

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Steps to reproduce

Yahoo mail users are experiencing trouble while accessing classic mail in IE11 browser. IE11 browser is blocking HTTP/2 POST method XHR requests. We are observing this issue since last Thursday (04/25 ~6am PST). This issue is specific to IE11 and it is reproducible consistently. This is not seen in any other browsers.


Comments and activity

  • Steps to reproduce:

    • Open Internet Explorer 11 browser on Windows 10
    • Log-in to Yahoo Mail (
    • Launch classic mail by hitting this url
    • Open browser developer tool and filter XHR requests
    • Notice POST method XHR requests over HTTP/2 are not responding
    • Developer tool console also shows the below network error
      “SCRIPT7002: XMLHttpRequest: Network Error 0x2ef3, Could not complete the operation due to error 00002ef3”
  • Microsoft Edge Team

    Changed Assigned To to “Payal S.”

    Changed Status to “Confirmed”

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