XHR is broken in 0.34.3

[robbtraister]

It seems that a regression was introduced into the XMLHttpRequestController in the 0.34.3 release.

I have not yet been able to identify the root cause, but here is a codesandbox showing a test passing with window.fetch() and failing with axios.put(). The XHR request simply never returns and results in a timeout.

[robbtraister]

I first noticed this today because msw@2.4.4 was just released with a dependency bump to @mswjs/interceptors@0.35.0 from 0.29.0. I can still correctly use msw@2.4.4 by pinning to @mswjs/interceptors@0.34.2 (or prior)

[robbtraister]

It looks like the request body has already been read/locked before we attempt to clone it (in order to determine content-length), where it is no longer cloneable.

interceptors/src/interceptors/XMLHttpRequest/XMLHttpRequestController.ts

Line 299 in 515dd36

this[kFetchRequest].clone()

[ddolcimascolo]

Hi all, posting here from mswjs/msw#2273.

Anything I can do to help?

Thx,
David

[kettanaito]

Released: v0.35.3 🎉

This has been released in v0.35.3!

• 📄 Release notes
• 📦 npm package

Make sure to always update to the latest version (npm i @mswjs/interceptors@latest) to get the newest features and bug fixes.

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