javascript - Why can I not see all the expected headers from a Fetch Response? -

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i using fetch api make http request.

fetch(url, options)   .then(response =>      console.log(...response.headers.keys())); // "content-type"

but can see chrome there more headers in inbound http response (date, server, transfer-encoding, x-foo). why might not able see them in output above code?

i running chrome following flags:

c:\path\chrome.exe  --disable-web-security --user-data-dir=c:\path\tmp\chrome

response:

body: (...) bodyused: false headers: headers ok: true status: 200 statustext: "ok" type: "cors" url: "http://origin?query"

i note making non-cors request retains headers. cors strip them?

body: (...) bodyused: false headers: headers ok: true status: 200 statustext: "ok" type: "basic" url: "http://origin?query"


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