IE11 websocket upgrade header value is off the spec

Confirmed Issue #21610424 • Assigned to Sujeet K.


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May 14, 2019
This issue is public.
Found in
  • Internet Explorer
Reported by 1 person

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Steps to reproduce

According to rfc spec the upgrade header value websocket must be all in lower case.

The request MUST contain an |Upgrade| header field whose value MUST include the "websocket" keyword.

IE11 websocket client is making a request with upgrade header value that has uppercase as the first character Websocket.


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    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “Stephanie M.”

      Changed Status to “Confirmed”

    • Hi, thank you for reporting this issue. Can you clarify whether this is just a spec/consistency issue, or if it breaks functionality in some way for you. Please let us know if you have more details. 

    • Microsoft Edge Team

      Changed Assigned To from “Stephanie M.” to “Sujeet K.”

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