IE11 websocket upgrade header value is off the spec

Issue #21610424 • Unassigned


undefined u.
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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