NEW 171552
[Fetch API] Response disturbed when trying to clone before consuming 
https://bugs.webkit.org/show_bug.cgi?id=171552
Summary [Fetch API] Response disturbed when trying to clone before consuming
Peleg Rosenthal
Reported 2017-05-02 09:05:31 PDT
In latest nightly (r216067), evaluation of `response.body` leads to the response being "disturbed" when trying to clone it despite `body.locked` and `bodyUsed` being false. Steps to reproduce: 1. open safari 2. go to https://google.com 3. open devtools 4. run the following: fetch('/').then(r => { r.body; r.clone() }) What happens? "TypeError: Cannot clone a disturbed Response" is thrown. What's expected to happen? Both FF and Chrome clone the response correctly if it hasn't been consumed yet. JSBin here http://jsbin.com/marogokuna/1/edit?js,output
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Alexey Proskuryakov
Comment 1 2017-05-03 17:12:53 PDT
This works in shipping Safari/WebKit. I can reproduce the failure in nightly.
Radar WebKit Bug Importer
Comment 2 2017-05-03 17:13:11 PDT
<rdar://problem/31977099>
Peleg Rosenthal
Comment 3 2017-05-03 17:19:22 PDT
Thanks Alexey, I'm actually able to reproduce this also in Safari 10.1 (12603.1.30.0.34) The only difference is that I need to catch the rejection for it to surface: fetch('/').then(r => { r.body; r.clone() }).catch(console.log)
Alexey Proskuryakov
Comment 4 2017-05-03 20:38:50 PDT
Thank you for the correction!
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