Sorry for the title, I made a mistake while copy-pasting. It should have been something like "Replay XHR with on CORS Preflight requests does not send body data", but I can't edit.

Title corrected as requested in C#1.

Thanks for the issue...

As per comment #0, Tried to reproduce the issue on reported chrome 70.0.3538.102 using Mac 10.14.0. Attaching screencast for reference.
Steps:
-----
1. Launched chrome
2. Opened given script and opened Dev tools> Network >XHR 
3. Clicked on Run and observed tow responses 
As we have not seen values>  param1: 'value1', param2: 'value2', param3: 'value3' as per attached screencast.

@Reporter: Could you please check the attached screen cast and please let us know if anything missed from our end.

Deleted: 904462.mp4 1.2 MB

	904462.mp4 1.2 MB View Download

Actually it was my mistake on this too, because on my demo video the code is a little different than the actual JSFiddle. But it doesn't really make any difference. 

I can see in your video that your request is also sending a body (even if it's not JSON formatted). If you try to click "Replay XHR" on that request, you will see that the body is missing on the new request.

And this is the correct JSFiddle link: http://jsfiddle.net/9khcgu7j/3/

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Able to reproduce the issue on the reported chrome 67.0.3396.99,latest canary 69.0.3486.0 using Windows 10, Mac 10.14.0 ,Ubuntu 14.04. Below is the bisect information for same.

Bisect Info:
================
Good build: 65.0.3218.0
Bad build: 65.0.3219.0

CHANGELOG URL:
You are probably looking for a change made after 528737 (known good), but no later than 528738 (first known bad).
https://chromium.googlesource.com/chromium/src/+log/2c830410fd8a0d50618b00a97ac314f5ea063a1f..927fd20565f2e2192a61f17013816d2cf3f9720b

Suspect: https://chromium.googlesource.com/chromium/src/+/927fd20565f2e2192a61f17013816d2cf3f9720b

Reviewed-on: https://chromium-review.googlesource.com/849117

Eugene Ostroukhov: Please confirm the issue and help in re-assigning if it is not related to your change.

Note: As Author is not active (last visited > 30 days ago ). Hence, CC'ing the reviewer and also changing the owner as per bisect information.  

Thanks!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cd6f155a01135de13ec02382b6e0996cafbaa63b

commit cd6f155a01135de13ec02382b6e0996cafbaa63b
Author: Joey Arhar <jarhar@chromium.org>
Date: Sat Dec 29 00:24:36 2018

[DevTools] Re-add post data to XHRReplayData

This re-adds post data saved in XHRReplayData which was removed in
http://crrev.com/c/849117
That change fixed a performance issue which I could not reproduce with
this patch applied.

Bug:  904462 
Change-Id: Iacd677e235956922b9899d04b670f7ea66c4d09a
Reviewed-on: https://chromium-review.googlesource.com/c/1389017
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619213}
[modify] https://crrev.com/cd6f155a01135de13ec02382b6e0996cafbaa63b/third_party/blink/renderer/core/inspector/inspector_network_agent.cc
[modify] https://crrev.com/cd6f155a01135de13ec02382b6e0996cafbaa63b/third_party/blink/renderer/core/inspector/inspector_network_agent.h
[modify] https://crrev.com/cd6f155a01135de13ec02382b6e0996cafbaa63b/third_party/blink/renderer/core/inspector/network_resources_data.cc
[modify] https://crrev.com/cd6f155a01135de13ec02382b6e0996cafbaa63b/third_party/blink/renderer/core/inspector/network_resources_data.h
[modify] https://crrev.com/cd6f155a01135de13ec02382b6e0996cafbaa63b/third_party/blink/renderer/core/probe/core_probes.pidl
[modify] https://crrev.com/cd6f155a01135de13ec02382b6e0996cafbaa63b/third_party/blink/renderer/core/xmlhttprequest/xml_http_request.cc
[add] https://crrev.com/cd6f155a01135de13ec02382b6e0996cafbaa63b/third_party/blink/web_tests/http/tests/inspector-protocol/network/resources/cors-return-post.php
[add] https://crrev.com/cd6f155a01135de13ec02382b6e0996cafbaa63b/third_party/blink/web_tests/http/tests/inspector-protocol/network/xhr-post-replay-cors-expected.txt
[add] https://crrev.com/cd6f155a01135de13ec02382b6e0996cafbaa63b/third_party/blink/web_tests/http/tests/inspector-protocol/network/xhr-post-replay-cors.js

I submitted a fix which should be in canary within the next 24 hours, ibrahim.alexnandru@gmail.com let me know if you can reproduce on canary: https://www.google.com/chrome/canary/

Sorry for my delay on this. I can confirm that it works as expected on Canary.

Thank you!