Revision 156a37a385f8c27d8b35995e88b913d5cfb1e02a authored by Simon Sapin on 21 April 2016, 08:35:40 UTC, committed by Anne van Kesteren on 21 April 2016, 08:35:40 UTC
https://html.spec.whatwg.org/multipage/comms.html#dom-websocket says to parse the first argument with https://url.spec.whatwg.org/#concept-url-parser, which in turns says:

> Remove any leading and trailing C0 controls and space from input.

Which links to:

> The C0 controls and space are C0 controls and code point U+0020. 
> The C0 controls are code points in the range U+0000 to U+001F, inclusive.

So a trailing U+0000 is removed from a string when parsing it as an URL.
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