UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36

Steps to reproduce the problem:
1. Open https://jsfiddle.net/vsy2L3k8/
2. Open devtools, network panel
3. Click run button

What is the expected behavior?
Seen only 2 network entries:

1. The request for ggv2.js, with type xhr, response 301 Redirection
2. The request for services.js, with type application/javascript

What went wrong?
We get 3 network entries:

1. The request for ggv2.js, with type xhr, response 301 Redirection
2. Another request for ggv2.js, with type text/html
3. The request for services.js, with type application/javascript

Did this work before? N/A 

Chrome version: 59.0.3071.115  Channel: stable
OS Version: 4.8.0-59, Ubuntu 16.10
Flash Version: 

I think this is a bug in the Network tab for Devtools, as the extra entry shouldn't be recorded.
 

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