http/response.ok is undefined although API says it should be boolean

[wardbell]

Steps to reproduce and a minimal demo of the problem
Examine the response object returned by any http.get

Current behavior
res.ok is undefined.

Expected/desired behavior
res.ok, per API doc, " True if the response's status is within 200-299"

Let's implement it:

get ok() { return this.status >= 200 && this.status <= 300; }

Other information
beta.14

[oliverjanik]

Dup? #6390

[pkozlowski-opensource]

Yup, looks like duplicate of #6390

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